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Pliocene) of Jamaica

Pliocene) of Jamaica

Contr. Tert. Quatern. Geol. 35(1-4) 147-160 1 fig., 2 tabs, 4 pis. Leiden, April 1998

Otolith-based fishes from

the Bowden shell bed () of Jamaica:

systematics and palaeoecology

Gary Layne+Stringer

NORTHEASTLOUISIANA UNIVERSITY

MONROE, LOUISIANA, U.S.A.

Stringer, Gary Layne. Otolith-based fishes from the Bowden shell bed (Pliocene) ofJamaica: systematics and palaeoecology. In: Donovan, S.K.

2 4 (ed.). The Pliocene Bowden shell bed, southeast Jamaica. — Contr. Tert. Quatern. Geol., 35(1-4): 147-160,1 fig., tabs, pis. Leiden, April

1998.

otolith studies have the to substantial Investigations of teleosteanotoliths from the Caribbean are quite restricted, although potential provide

shell bed, Bowden are described herein information on the palaeontology of the region. The fish otoliths from the Bowden Formation, Jamaica,

in order to ascertain the ichthyological fauna and related palaeoecological conditions. Previous investigations of otoliths for the Caribbean are

addressed and support the importance ofthis study. Approximately 1,650otoliths representing at least 38 teleost families and 68 species were obtained from the shell bed at the type locality of the Pliocene Bowden shell bed. Comparison of the identifiedotoliths to the bathymetric

distributions of closely related Recent taxa revealed a diversifiedassociation with shallow-water marine forms (including euryhaline species),

and shelf forms with and elements. The also contained forms neritic species, middle to outer some upper slope pelagic otolith assemblage

commonly associated with reef environments. The otolith assemblage of the Bowden shell bed is quite similar to the Recent Caribbean

ichthyological fauna with some notable exceptions (three Pacific forms).

Key words — Bowden shell bed, otoliths, fossil fishes, otolith morphology, systematics, palaeoecology.

G.L. Stringer, Department ofGeosciences, Northeast Louisiana University, Monroe, Louisiana 71209, U.S.A.

Contents can contribute untold and misleading numbers of skeletal

elements to the thanatocoenosis. Since an individual fish can

Introduction and contribute two saccular otoliths to the fossil record, the previous investigations p. 147 only

Material and methods 148 of otoliths is a more precise indicator of abundance p. presence and identificationof otoliths 148 (Stringer, 1986). Morphology p. studies from the Caribbean that include Systematic palaeontology p. 149 Palaeontological

teleostean otoliths limitedand detailed Palaeoecology based on otoliths p. 151 are quite descriptions

Comparisons to otherotolith faunas of the of fossil otolith assemblages are almost nonexistent. This is

especially true for Jamaica, despite the of thick Caribbean p. 153 presence

of to Quaternary marinesedimentary Conclusions p. 154 sequences

154 rocks (Purdy et al., 1996). Some such as the molluscs Acknowledgements p. groups,

References and other invertebrates, are well documented from the Plio- p. 154

cene Bowden shell bed in Jamaica (Donovan et al., 1995).

of otolith studies in the However, a survey Tertiary Carib-

Introduction and previous investigations bean Faunal Province clearly illustrates the lack of extensive

research in this region. Fitch & Barker (1968) mentionedthe

Fossil teleosteanotoliths have been utilised in a very limited occurrence of a morid otolithfrom Jamaica, and Fitch (1969)

manner in the investigation of the palaeontology of the noted that the Bowden shell bed in Jamaica containedotoliths

Caribbean region, although fossil otoliths have the potential of lanternfish(family Myctophidae).

to contribute meaningful informationon the fish fauna and Clarke & Fitch (1979), in a study of Cenozoic teuthoid palaeoecology. The use of fossil teleosteanotoliths provides (cephalopod) statoliths, reported that a 225 kg sample from

a more detailed and accurate representation of the ichthy- the Bowden shell bed in Jamaica yielded 25,OCX) otoliths.

fauna ological than the exclusive use of skeletal components Fitch (1969) noted that the otoliths probably represented

such as teeth, scales, spines and vertebrae (Nolf, 1985; more than 110 kinds of fish belonging to 50-60 families.

Breard & Stringer, 1995). Otoliths can also provide a more Some of the forms mentioned by Fitch included bonefish accurate interpretation of abundance. Fishes, sharks and rays (Albula), croakers (iMicropogon, Larimus and Equetus), 148

soldierfish (Myripristis and Holocentrus), cardinalfish(Apo- processed by the Vokes in obtaining the otoliths. Otoliths Florida gon), jawfish(Opisthognathus), pearlfish (Carapus), her- were also provided by Roger Portell of the Museum The rings, anchovies, gobies, goatfish, gurnards, cuskeels, catfish, ofNatural History (University of Florida, Gainesville).

forms. Fitch otoliths obtained from codlets and a few deeper-water Unfortunately, were a sample weighing approxi-

10 A small of matrix 2 never formally describedthe otoliths from the Bowden shell mately kg. sample (approximately kg)

Dr Jon ofOkaloosa-Walton Commu- bed. Upon his death, the otoliths were placed in the John E. was supplied by Bryan The Bowden shell bed Fitch Collection of Research Fossil Otoliths housed at the nity College (Fort Walton, Florida).

Institut des Sciences Los Angeles County Museum of Natural History (Robert otolith collection from the royal

ofthe data naturelles de Belgique (IRScNB, Brussels) was examined on Lavenberg, pers. comm.). A check pre-catalogue

Dirk Nolf. addition to the material at the Los Angeles County Museum revealed that the vast a loan supplied by Dr In

bed otolith material identi- described examination of the Bowden majority of the Bowden shell was above, a preliminary

data indicated shellbed material of the late John Fitch was made in 1984. fied only to family level. The pre-catalogue a

the material of Dr Fitch could not be total of only 4,946 otoliths, not the 25,000reported by Clarke Unfortunately, re-

examined for this & Fitch (1979). In addition, the inventory indicated 89 taxa study.

kinds 110 It The need for bulk for otolith is or of otoliths, not the taxa previously reported. sampling investigations

illustrated when the number of otolithsand is is uncertain whether the collection is the same, but, if it is, clearly species

for the various The 10 yielded there is a discrepancy of over 20,000 otoliths. compared samples. kg sample

An assemblage consisting of 2,074 otoliths from the over 200 otoliths and 30 species, while the 2 kg sample

middle Miocene Gatun Formation of Panamawas described yielded about 30 otoliths and 14 species. The 70 kg sample

the in Gillette (1984). The assemblage consisted of 26 taxa of produced over 1,200otoliths and 55 taxa. By comparison,

marine fishes identifiedby John Fitch. Unfortunately, Fitch largest sample in the study of the Neogene otoliths from the

Dominican Nolf & supplied only a list of the otoliths and was not able to com- Republic by Stringer (1992) was ap- the otoliths and the plete the study before his death. Gillette presented the list proximately 120kg which yielded most

number of In both of these exactly as provided by Fitch, but did add some annotations, largest species (62 species).

studies well definite correlation exists and also noted that the specimens were unavailable for as as many others, a size and the number of renewed study. A few other studies have mentioned the between sample species recognised.

from The wet-screened a of sieve occurrence of otoliths, including Schubert (1909) samples were using variety mesh Standard will Panama, Leriche (1938) from Colombia, Weiler (1959) from sizes. Sieves from 30 to 40 (U.S. Sieves) retain almost all otoliths. Sieve sizes Mexico and Casier (1966) from Barbados. Stringer (1992b) species represented by

otoliths from the Bowden shell bed than 25 mesh lose fish with small oto- published an abstract on greater may species

in Jamaica and noted at least 55 taxa of teleosts. liths and should be avoided. Otoliths for this study were

examined a binocular stereozoom with There are only two comprehensive studies of fossil using microscope

otoliths from the entire Caribbean region (Nolf, 1976; Nolf 10x-20x eyepieces with variable power (lx-2.5x). Generally,

& Stringer, 1992). Nolf (1976) described 66 otolith-based the otoliths from the Bowden shell bed are well preserved,

and in size from less than 1 to 8 teleost taxa from the Neogene of Trinidad. Most of the taxa mostly complete, range mm

in came from various Miocene formations, but there were a few length.

from the Pliocene. The fauna consisted mainly of neritic

forms, together with a few mesopelagic elements and demer-

MORPHOLOGY IDENTIFICATION OF OTOLITHS sal (bottom dwelling) fishes from the upper slope. Nolf & AND

Stringer (1992) reported a highly diversifiedteleost fauna of

84 species for the Neogene of the Cibao Valley area, north- To utilise otoliths to reconstruct fossil fish faunas and to

the ern Dominican Republic. The study included numerous determinepalaeoecological conditions, identificationof

collecting localities from four Miocene-Pliocene units (Bai- otolith is essential. Salientmorphological features are used to

toa, Cercado, Gurabo and Mao Formations). Palaeoenviron- identify the otoliths. Although most bony fishes contain three

and mental conditions based on the present-day bathymetric otoliths in each of the two labyrinths (the sagitta, lapillus

distribution of related teleost taxa were determinedfor each asteriscus), the sagitta is used for identification purposes in

the of the formations. the majority of cases. The sagitta tends to be the largest of

face. otoliths and has a characteristic pattern on the inner

This pattern is usually indicative of the family, and in many

MATERIAL AND METHODS examples the and species (Nolf, 1985).

The innerface of the sagitta has numerous salient mor-

features. The inner face is the side The Bowden otoliths for this study were supplied by several phological inward-facing

otoliths of the that is connected and individualsand institutions. The largest percentage of sagitta to nerve endings usually

has characteristic it known the sulcus was provided by Drs Harold and Emily Vokes of Tulane a pattern on as (Fig. 1). the University, New Orleans (Louisiana). Much of their material The sulcus is usually the most conspicuous feature on

from the innerface of the The sulcus be undividedin the was obtained during the collectionof molluscs type sagitta. may other locality. It is estimated that at least 70 kg of sample was otoliths of some fishes and divided into two parts in 149

species. If the sulcus is divided, the anterior portion is known additionto modernteleosteanotoliths, comparisons were also

the Domini- as the ostium, while the posterior portion is known as the made to fossil Miocene-Plioceneotoliths from cauda. can Republic and Trinidad for this study.

Fossil otoliths should be assigned to living taxa where

possible. This requires not only excellent Recent comparative

collections, but also well-preserved fossil material. The

identification of fossil otoliths can be limited by several

conditionof the conditions. Sometimes, the preservation or

the fossil otolith may limit identification. In some cases,

factor. variability within a species may be a restricting

also be restricted due the limited Otolithidentificationmay to

knowledge of Recent forms. For example, in this study, the

knowledge of Recent gobiid otoliths from the Caribbean is

too inadequate to identify the fossil gobiids at the generic or

species level. Therefore, the gobiids are identified as form

groups withinthe family Gobiidae. Another problem related

to fossil otolith identification has recently been identified by

otoliths of Schwarzhans (1994), who found that the some

dimor- species of fish (Recent and fossil) may exhibit sexual

phism. However, this sexual dimorphism of otoliths has only

in of the Fig. 1. General morphology ofthe saccular otolith (sagitta). been clearly recorded one family teleosts, Ophidii-

numbers of otoliths dae. Finally, in some species, large

Other features of the described needed for prominent sagitta are by representing all stages of growth are species referring to the margins. The dorsal, anterior, ventral and determination.As noted by Nolf & Stringer (1992), extensive posterior margins can be recognised on the sagitta, although series of large otoliths are often required to identify good

unclear. from the their exact boundaries may be Projections species-diagnostic criteria. This is illustrated by Diaphus

otolith named the periphery of the are according to margin on otoliths in which only adultotoliths larger than 2 mm show

dorsal dome is which they are located. Therefore, a a projec- characteristic features (Brzobohaty & Nolf, 1995). Some tion from the dorsal margin. The rostrum and antirostrum are species have otoliths with such generalised morphology that

anterior A rim located above prominent projections. ridge or even large specimens lack diagnostic features. the sulcus is the crista and below the sulcus taxonomic superior a ridge Extinct genera and species may also present is the crista inferior. A above the sulcus is referred otoliths extinct forms and do depression problems. Some represent not of the to as the area. Colliculum deposits (raised portions have living representatives. This problem has been ap-

Cauda referred sulcus floor) in the ostium and are to as proached in several different ways. One method is to desig- anteriorand posterior colliculum, respectively. nate a fossil genus which is commonly doneby palaeontolo-

the otolithis another The shape or outline of morphologi- gists working in other groups. However, the presumed

used for taxonomie Geometric terms otoliths cal feature purposes. 'extinct' form may be a Recent genus of which the such and often utilised of as circular, elliptical subtriangular are are unknown. Considering the imperfect knowledge

describe otolith In addition the of the ifworkers do to shapes. to shape Recent fish otoliths, this is a distinct possibility otolith, the of the also known as fossil otoliths to shape margin, sculpturing, not take great care to extensively compare

be be entire lobed, Another method, Nolf is may diagnostic. Margins may (smooth), Recent genera. proposed by (1985), Otolith sinuate, crenulate, denticulate, serrate or irregular. the use of plural genitive names. In this method, species margin sculpturing, as well as many other morphological which do not fit in known Recent generaare cited by plural

described in detail Smale features, were illustratedand by et genitive names, preceded by the word 'genus'. The method

various al. (1995). Morphological features of otoliths from proposed by Nolf is commonly utilised by many otolith families (congrids, myripristids and albulids) were illustrated palaeontologists, especially those in Europe (Steurbaut, 1984; in Stringer (1979). Brzobohaty, 1986; Nolf & Cappetta, 1989; Radwanska,

determined The taxonomie position of a fossil otolith is 1992). by comparison to otoliths of identified Recent fishes or by comparison with in situ otoliths in identified fossil fish

PALAEONTOLOGY skeletons. Since fossil fish skeletons with in situ otoliths are SYSTEMATIC extremely rare, the vast majority offossil otolith identifica-

otoliths at least 38 teleost tion is based on a comparison with otoliths of Recent forms. Approximately 1,650 representing familiesand obtained from the shell bed of As noted by Nolf (1985), the precision of fossil otolith 68 species were

the Bowden Formation. All of the identifications of this identification will depend largely upon the knowledge of

based the or the saccular otoliths Recent otoliths. Several museums have Recent comparative investigation are on sagittae

of the teleost for the where the collections with 2,(XX) to 6,(XX) species of fish otoliths. In except family Plotosidae, 150

lapillus or utricular otolith is utilised for identificationof the this study follows that of Nelson (1984, 1994). A list of all

Plotosus. the catfish In catfish order Siluriformes, the lapillus otolith-based teleosts identifiedfrom the type locality of the

is the largest and most diagnostic of the otoliths, and is Bowden shellbed in Jamaica is presented in Table 1.

utilisedfor taxonomic purposes. The classification scheme of

Family Taxon Plate and figure number

Albulidae Albula sp.sp. PI. 1, Fig. 1 [Nolf&[Nolf & Stringer, 1992,1992,pi.pi. 9, figsfigs 1, 2)2]

Heterenchelydae PythonichthysPythonichthys sp. PI. 1,Fig. 2 [Nolf & Stringer, 1992,1992,pi.pi. 9, figsfigs 8-10]

Congridae AriosomaAriosoma balearica Pi.PI. 1, Fig. 3 [Nolf & Stringer, 1992,1992,pi.pi. 9, fig.fig. 3]

RhyncocongerRhyncoconger flava PI. 1,1,Fig. 4 [Nolf & Stringer, 1992,1992, pi.pi. 9, figs 11-13]

Rhechias tysanochila Pi.PI. 1, Fig. 5 [Nolf & Stringer,Stringer, 1992,1992, pi.pi. 9, figsfigs 6, 7]7]

Gnathophis sp. [Nolf, 1976,pi. 2, figs 5-7]

PI. 7 Paraconger sp 1, Fig.

Engraulidae Engraulidaeindet.indet. [Nolf& Stringer, 1992,pi. 9, fig. 16]

Plotosidae Plotosus sp.sp. [Nolf& Stringer, 1992,pi. 10,10, fig. 3]3]

SternoptychidaeSternoplychidae Polyipnus sp. PI. 1, Fig. 6 [Nolf& Stringer,Stringer, 1992,1992, pi. 10, fig.fig. 3]

ValenciennellusValenciennellus not sp.sp. not figuredfigured

Synodontidae Saurida caribbaea PI. 2, Fig. 1 [Nolf& Stringer,Stringer, 1992,1992, pi. 10, fig. 3]

Myctophidae Diaphus brachycephalusbrachycephalus PI. 2, Fig. 2 [Nolf& Stringer, 1992,pi. 10, figs 4-9]4-9]

* 11 PI. 2, 3 & 10, Diaphus sp. 2, Fig. [Nolf Stringer,Stringer, 1992,pi. 10, figs 18-23]

Diaphus sp. notfiguredfigured

Symbolophorus aff. veranyi [Brzobohaty & Nolf, 1996, pi.pi. 8,8, figs 17-19]

Hygophum aff. benoilibenoiti [Nolf& Stringer, 1992, pi. 10,10, fig. 32]32]

Hygophumsp.sp. not figuredfigured

MyctophumMyctophum sp. [Nolf& Stringer, 1992, pi. 10,10, figs 14, 15]

Lobianchia PI. sp. PI. 2, Fig.Fig. 55

PI. 44 & Bregmacerotidae Bregmaceros sp. PI. 2, Fig.Fig. [Nolf Stringer,Stringer, 1992,pi. 11, figs 7-8]

GadidaeGadidac Gadiculus labiatuslabiatus [Nolf, 1980,1980, fig. 49H]

Ophidiidae LepophidiumLepophidiumlatesulcatum PI. 2, Fig.Fig. 6 [Nolf & Stringer, 1992,pi. 11, fig. 11]11 ]

LepophidiumLepophidiumcervinumcervinum [Nolf, 1980,1980,pi.pi. 3,3, figsfigs 1-8]

Otophidiumrobustumrobustum PI. 2,2, Fig.Fig. 7 [Nolf& Stringer, 1992,pi. 12, figs 4,4,5]5]

Otophidiumrobinsirobinsi PI. 3,3, Fig.Fig. 1 [Nolf& Stringer, 1992,pi. 11, figs 16-19]

BrotulaBrotula aff. clarkaeclarkae [Nolf& Stringer, 1992,1992,pi.pi. 11, fig.fig. 13]

LepophidiumLepophidiumsp.sp. not figuredfigured

PI. 2 1, CarapidaeCarapidac Carapus sp. 3,3, Fig.Fig. [Nolf, 1980,pi. 1, fig. 3]

EchiodonEchiodon sp. |Nolf,[Nolf, 1980,pi. 1, figs. 8,8,11]11]

Bythidtidae 'genus Dinematichthyinorum'Dincmatichthyinorum'smithvanizismilhvanizi [Nolf& Stringer, 1992,1992, pi.pi. 12, figsfigs 11,12]11, 12]

'genus Dinematichthyinorum' sp. notnot figured

Batrachoididae & 11, Porichthys sp. [Nolf(Nolf Stringer, 1992,1992, p. 11, fig. 3]3]

AtherinidaeAthcrinidac AtherinomorusAlherinomorus stipes [Nolf|Nolf& Stringer, 1992,1992,pi.pi. 12, figsfigs 13-16]13-16]

HemiramphidaeHcmiramphidae Hyporhamphus sp. [Nolf & Stringer, 1992,1992, pi.pi. 12, figsfigs 17,18]17, 18]

Anomalopidae PhthanophaneronPhthanophaneronsp. PI. 3,3, Fig.Fig. 33

Holocentridae Holocentrus & sp. [Nolf|Nolf Stringer, 1992,1992, pi.pi. 12, fig.fig. 25]

Scorpaenidae Scorpaenidaeindet.indet. |Nolf[Nolf& Stringer, 1992,1992, pi.pi. 12, fig.fig. 26]

Triglidae Prionotus cf. carolinus [Nolf|Nolf& Stringer, 1992,1992, pi.pi. 12, fig.fig. 27]

Acropomatidae ParascombropsParascombropscf.cf. spinosus PI. 3,3, Fig. 55

Serranidae & 1992, 13, Diplectrumsp.sp. [Nolf Stringer, 1992,pi.pi. 13, fig.fig. 7]

PriacanthidaePriacanthidac cf. altusalms PI. 3,3, Fig. 44

* * & Apogonidae Apogon sp.sp. 1 [Nolf& Stringer, 1992,1992, pi.pi. 13, fig.fig. 10]10]

2* & Apogon sp.sp. [Nolf Stringer, 1992,1992, pi. 13, fig.fig. 13]13]

3*3* & Apogon sp.sp. [Nolf Stringer, 1992,1992, pi. 13, figsfigs 15,16]15, 16]

Apogon sp.sp. 4*4* [Nolf& Stringer, 1992,1992, pi. 13, fig. 12]

PI. 6 & LutjanidaeLutjanidac PristipomoidesPrislipomoidessp.sp. 3,3,Fig.Fig. [Nolf|Nolf Stringer, 1992,pi. 14, figs 2-4]2-4]

Rhomboplites aurorubens PI. 4, Fig. 1

Gerreidae * EucinostomusEucinostomus sp. 11 [Nolf & Stringer, 1992, pi. 14, fig.fig. 7]

cf. Moharra sp.sp. not figured

Haemulidae Haemulon 2 sp. PI. 4,4, Fig.Fig. [Nolf& Stringer, 1992, pi. 14, figs 16-19]

Sciaenidae Protosciaena trewavasae PI. 4,4,Fig.Fig. 3 [Schwarzhans, 1993, figs 344, 345]

Umbrina & sp. [Nolf Stringer, 1992,1992, pi. 14, fig.fig. 18]18]

Bathyclupeidae Bathyclupea sp. [Nolf, 1976,1976, pi.pi. 9,9, fig.fig. 4]

& Mugilidae Mugil sp. [Nolf Stringer, 1992,1992, pi.pi. 15, fig.fig. 11]

Sphyraenidae & Sphyraena sp. [Nolf Stringer, 1992,1992, pi.pi. 17, fig.fig. 1]1]

Opisognathidae LonchopisthusLonchopislhus micrognathusmicrognathias PI. 4,4, Fig.Fig. 44 [Nolf& Stringer, 1992,pi. 15, figs 7-9]7-9] 151

Uranoscopidae Uranoscopidae indet. not figured

Gobiidae Gobiidae * sp. 1*1 PI. 4, Fig. 5 [Nolf& Stringer, 1992,pi.pi. 17, fig. 12]

Gobiidae 3* 6 sp. PI. 4, Fig. 6 [Nolf& Stringer, 1992,pi. 17, fig. 14]

Gobiidae indet. not figured

Bothidae Citharichthys sp. [Nolf, 1976,pi. 9, fig. 12]

Bothidae indet. [Nolf & Stringer,Stringer, 1992,pi. 17, figs 15,16]15, 16]

BothidaeBothidae indet. not figured

Bothidae indet. not figured

PleuronectidaePlcuronectidae Pleuronectidae indet. [Nolf & Stringer, 1992,pi. 17, fig. 20]

Cynoglossidae Cynoglossidae indet.indet. [Nolf(Nolf & Stringer, 1992,pi. 17, fig. 17]17]

Soleidae Soleidae indet. [Nolf& Stringer, 1992,pi. 17, figs 18,18,19]19]

* Species designatedwith numbersnumbers refer to specimens described and figuredin Nolf&Nolf& Stringer (1992). Plate andfigure numbers enclosed in brackets refer

topreviously figuredmaterial.

Table 1. List of all otolith-based teleosts (class Osteichthyes) identified from the shell bed ofthe Pliocene Bowden Formation in Jamaica.

The vast majority of the identified taxa represent forms PALAEOECOLOGY BASED ON OTOLITHS

that are presently known from the Atlantic Ocean including

the Gulf of Mexico and the Caribbean area. Three notable Studies have indicated that fossil otolith assemblages will exceptions are the catfish genus Plotosus, the ophidiid spe- reflect, with reasonable certainty, the ichthyological fauna cies Brotula clarkae and the lanterneye fish Phthanophan- inhabiting an area during a specific interval of geologic time

eron, all of which are known from the Pacific. The lapilli (Schwarzhans, 1984; Stringer, 1992a; Breard & Stringer, from Plotosus compare remarkably well with those of the 1995). As a general principle, the otoliths will represent a Recent species Plotosus anguillaris (see Nolf & Stringer, part of the biocoenosis. General palaeoecological parameters 1992, pi. 10, fig. 2). The otoliths from Brotula clarkae are can be determinedby utilising data on the preferred habitats also distinctiveand since the very diagnostic they represent exercised of comparable modem fishes. Greater care must be only Brotula species with a prominent rostrum (see Nolf, with older Palaeogene and Cretaceous otolith assemblages 1980, pi. 2, fig. 3). The otoliths fromPhthanophaneron seem because of fewer taxonomic affinities with Recent genera.

to be closely related toPhthanophaneron harveyi [Rosenblatt Also, fewer Cretaceous faunas have been studied (Hud- & 1976) which is foundin the Gulfof Califor- Montgomery, dleston & Savoie, 1983; Nolf & Dockery, 1990; Stringer, nia and the eastern tropical Pacific (Nelson, 1994). The 1991;Nolf& Stringer, 1996; Rana, 1996). Nolf(1985) noted of these three Pacific forms is relicts presence interpreted as that otolith associations will reflect the fishes present in a of the western Tethys fauna. No new species are introduced qualitative sense, but otolith faunas are not a quantitative

from the Bowden shell bed at this time. Several new species measure of the biocoenosis. However, Nolf & Cappetta

may be represented, but adequate growth series were not (1989) suggested a more objective method of interpreting available to make this determinationfor several taxa, such as indicated otoliths. Nolf& Brzobo- palaeobathymetry as by andLobianchia all of the Lepophidium sp. sp. Essentially, otoliths haty (1992) described a method utilising that was

taxa from the Bowden shell bed have been described and suited for the bathymetric interpretation of associations with illustrated Nolf & previously, mainly by Stringer (1992). deep neritic or deep-water fishes.

However, two taxonomic changes should be noted from Nolf The general bathymetry of the Bowden shell bed can be

& Stringer (1992). Hildebrandia was synonymised with deduced by the ratio of neritic fishes to myctophids and Rhynchoconger Smith (1989) in his revision of Recent by macrourids. Nolf & Brzobohaty (1992) noted that otolith western Atlantic eels, and the form reported as Cte- conger associations with both neritic species and myctophids, but nosciaena latecaudata Protosciaena probably represents few or no macrourids, are indicative of neriticenvironments

trewavasae described and illustrated in Schwarzhans as exposed to oceanic influence. The proportion of myctophid References illustrations of the (1993). to previous taxa as otolithsbecomes higher in the deeper part of the continental well as plates in the present study are presented in Table 1. shelf. The otolith assemblage from the Bowden shell bed

taxa examined in the are illustrated Significant present study contains neritic species and myctophids with no macrourids,

in Pis 1-4. and is interpreted as indicative of a neritic environment

In some cases, the present knowledge of Recent Carib- exposed to oceanic influence. beanotoliths is limited allow for identification too to beyond Except for a few taxa, all of the studied otoliths from the the level. There is also the of vari- family problem extreme Bowden shell bed exhibit close affinities to the Recent fauna

in the families Gobiidae, Bothidae and ability among species in the Caribbean, and seem to belong to the same climatic

Pleuronectidae. In the form Gobiidae, groups were desig- and environmentalrealm as their present-day relatives. Based nated while other such the bothids and groups as pleuronec- on the otolith association from the Bowden shell bed, palaeo-

tids were identified with ascertained to family. Species designated bathymetric parameters can be by comparisons

numbers, such as 1, refer to forms described and Diaphus sp. to related modern forms. General parameters followed by in Nolf& figured Stringer (1992). Nolf & Stringer (1992) in their study of the Neogene fish 152

also followed in this of that is utilised. References for fauna from the Dominican Republic are species genus bathymetric

the data for Recent forms include Bohlke & study. In the case of extant or closely-related species, Chaplin (1968), Hoese & Moore bathymetry indicated for the fossil species is that of the Darnell et al. (1983), Dawson (1966),

Recent species. (1977), Nelson (1984, 1994), Poll (1953, 1954,1959), Rob- and Smith & Kana- bins et al. (1986), Schwarzhans (1993)

distribution of zawa (1977). The present-day bathymetric

related Recent taxa is shown for the fossil otoliths in Table 2.

otolith-based taxa from the Bowden shell bed in m. 0 200 300 400 500 600 Forty-nine Taxa/Depth in m. 0 100 Albula Albula sp. in Table 2. were utilised in developing the palaeobathymetry

Pythonichthyspythonichthys sp. It shouldbe noted that the dotted lines in Table2 indicate the Ariosoma balearicabaleanca

and that 'E' RhyncocongerRhyncocongerflava diurnal migration of mesopelagic species an

Rhechias tysanochilatysarnKhila estuaries denotes fishes that may occur in during some stage Gnathophis sp. of their life. Nelson noted that the abundance of Plotosus E (1994) peak Plotosus sp. E~.— the PoiyipnusPolyipnus sp. most myctophid species is between 300-1,200 m during

ValenciennellusVatenciennellussp. 10-100 day, but this peak abundancechanges to m at night.

SauridaSaurida caribbaeacaribbaea Basically, the method described by Nolf & Brzobohaty Diaphus brachycephalusbrachycephalus (1992) is followedin analysing the palaeobathymetry. Thirty- Diaphus sp. 11 foundin the 0-100 seven of the 49 potential forms (76%) are Diaphus sp. which is the m (inner to middleshelf). This percentage, HygophumHygophum aff. H.//. range

benoiti highest for all depth levels, strongly indicates that the most Hygophum sp. 0-100 This is further probable water depth was m. supported MyctophumMyctophum sp. by the progressive decrease in percentages for depths greater Lobianchiabobiancma sp. the of than 200 m. However, presence mesopelagic forms, BregmacerosBregmaceros sp. the of GadiculusGadiculuslabiatusSab'uitus especially the myctophids, signifies proximity open

LepophidiumlêpOptdauËM oceanic conditions. The majority of the taxa present in waters latesulcatumlatesulcatum

LepophidiumLepophidium than 400 m are myctophids. cervinumcervinum deeper

robusium OtophidiumOtophidium robustum In addition to the graphical representation of the bathy- Otophidium robinsirobinsi indicated by otoliths in Table 2, it is interesting to Brotulaaff. B. metry claricaeclarkae fish There comparethe bathymetrical distributionof the taxa. Lepophidiumsp.sp.

Carapus taxa that be found in estuarineenvironments. Campus sp. are eight may

EchiodonEchiodonsp. indicative ofthe Twenty-eight of the taxa are restricted to or

EE" PorichthysPorichthys sp. shelf environment (generally 0 to 200 m). Several fish taxa AtherinomorusAtherinomorus stipes stipes - environment. Recent also suggest the presence of a reef HyporhamphusHyporhamphus sp.

Holocentrus cardinalfishes Holocentrus sp. squirrelfishes (Holocentridae) and (Apogoni-

cf. Parascombrops cf. characterised dae) as well as the Dinematichthyini are mainly spinosus

Diplectrum sp. as reef fishes in the Gulf of Mexico (Hoese & Moore, 1977). Pristigenys cf. u//m.taltus Nelson (1984, 1994) also stated that squirrelfishes and Apogon sp. 1 the shoreline and 100 Hoese Apogon sp.sp. 2 soldierfishes occur between m.

Apogon 3 sp.sp. & Moore (1977) stated that squirrelfishes are a tropical

Apogon sp.sp. 4 family represented by several species found, so far, only on Pristipomoides sp.sp.

Eucinostomus Er the offshore reefs in the Gulfof Mexico. Bohlke & Chaplin

sp. 1I

cfcf. MoharraMoharra EE" stated that and soldierfishes are reef sp.sp. (1968) squirrelfishes

Haemulonliacmulon sp. sp. fishes which occur in tropical waters around the world. They ProtosciaenaProiosciaena foundin crevices and in the trewavasae noted that these forms are caves

Umbrinai sp. rocks and reef. water taxa are mainly mesopelagic EE" Deeper Sphyraena sp. forms. LonchopisthusLonchopislhus ~T7E (Myctophidae) with no bathybenthic - micrognathusmicrognathia Gobiidae 11 EE" One form, Plotosus, was found in sp. seemingly enigmatic

Gobiidae 3 EE" sp. the otolith assemblage. Plotosus is an Indo-Pacific genusof

Gobiidaeindet. EE" and freshwater envi- catfish that occurs in neritic, estuarine

ronments Its is not surprising since taxa (Berra, 1981). presence Table 2. Present-day bathymetric range of teleostean it also found in the ofthe Dominican Republic represented in the Bowden shell bed, Jamaica. Dotted was Neogene

Nolf & This occurrence is probably lines indicate the nightly occurrence of mesopelagic by Stringer (1992). that related the Caribbean and the Central species near the surface. An E represents fishes to Tertiary province

in their life closure of the may occur estuaries at some stage of cycle. America seaway that existed prior to seaway

Brotula in the Pliocene (Keigwin, 1978). Plotosus, as well as

taxa taxa indeterminate to the For extinct or as species, aff. clarkae and Phthanophaneron sp., are interpreted as

global bathymetric distribution indicated for all Recent relicts of the ancient western Tethys fauna. 153

be from the which somewhat low Other palaeoecological indications may also gleaned recognised sample seems of otoliths. from the otolith-basedtaxa of the Bowden shell bed. Almost considering the size of the sample and number

in the Recent Caribbean and One is that with smallerotoliths lost all of the taxa are present fauna, explanation species were

forms. the due the sieve size This is further represent tropical and subtropical Therefore, to (25 mesh). supported by

is consideredto be similar to the modem the of sciaenid otoliths which tend to be climatic realm very large percentage

of 26-28°C in size. The fauna included distributed in Caribbean with surface sea water temperatures larger many taxa

both the Atlantic and Pacific. The sciaenids represented over (Dunn et al., 1981). The taxa associated with reef environ- 50% of the total number of otolithsand contained eight of the ments in the otolith assemblage support this observation.

twenty-six described taxa. Two Haemulon-type species were Based on the otoliths, the depositional environment was and constituted 15% of the characterised by normal marine salinity (approximately 35 the second most common types

total number of otoliths. No other percentages are given for %c), fairly low energy and mostly soft bottoms.

the other and of the taxa identifiedto The comparison of the fossil taxa from the Bowden shell taxa none are species.

these factors, it is difficult to bed to the bathymetric distributions of closely related Recent Due to quantitatively compare

forms the Gatun Formation with other faunas in the Caribbean. forms reveals an assemblage with shallow-water A diverse otolith fauna described from the (including several euryhaline species), reef inhabitants, and was Neogene of Trinidad Nolf collected at 30 middle to outer shelf forms with some upper slope and by (1976). Samples were

localities from nine Miocene and Pliocene formations in pelagic elements. The otolith assemblage, although predomi-

and otoliths. Sixty-six taxa were nantly shallow water (0-100 m), seems to represent a combi- Trinidad, produced 1,339

described from the otoliths with most of them from nationof several ecological environments. A driftedor mixed coming

Caldwell for the Bow- the Miocene units, mainly the Brasso, Nariva and Manzanilla assemblage was suggested by (1965) consisted of neritic fishes den shell bed, but Clarke & Fitch (1979) rejected this idea in Formations. The fauna primarily with few and demersal fishes from the favour of a 'mass mortality' deposit similar to those resulting a mesopelagic upper The and sciaenids from dinoflagellate blooms. Examining modern zoo- slope. ophidiids, pomadasyids represented

environment for the the most The most abundant taxa included indeter- geographical situations, a probable species.

bed reconstructed. Ifthe Bowden shell minate Gobiidae, Diaphus dumerili and Bregmaceros. Bowden shell may be

the otoliths from the of Trinidadresem- bed was deposited in the shallow, nearshore marine waters of Generally, Neogene

shelf to bled the present-day Caribbean fauna. an island with a very narrow region quickly dropping

situation and oceanic this would Some of the best faunas for would a slope open conditions, potential comparisons from the explain the combinationof several ecological environments. be those studied by Nolf & Stringer (1992) Neogene

in of the northern Dominican However, it should be The euryhaline, reef and shelf forms would be common Republic.

notedthat the materialfrom the Dominican the narrow shelf region, and the neritic and deeper-water Neogene Repub-

oceanic conditions lic represented otoliths from four different formations forms would be present due to the open rang-

shelf Pickerill al. in from Miocene for the lower adjacent to the narrow area. et (1996) ing age early-middle (NN4 Baitoa middle Pliocene for the concluded that the shallow-marineand relatively deep-water Formation) to (NN15 upper

Mao It must also be considered that 887 faunas ofthe Bowden shell bed were indicative of depostion Formation). samples localities in the northern from sediment gravity flows. Turbidite deposition would were collected from hundreds of

Dominican with 109 localities yielding otoliths account for the combinationof several ecological conditions Republic

et In Tulane University (New indicated by the teleostean otoliths. This interpretation would (Saunders al., 1986). addition, collected hundreds of localities in the be consistent with other palaeontological (invertebrate and Orleans, Louisiana) Dominican and otoliths vertebrate), sedimentary and tectonic studies of the Carib- same area of the Republic supplied bean and Central America (Briggs, 1974; Casey et al., 1975; for study. The otolith fauna from the Dominican Dunn etal., 1981; Duque-Caro, 1990; Gillette, 1984; Keig- largest Republic from the late Miocene NN11 Zone in the Cercado win, 1976, 1978; Smith, 1991; Whitmore & Stewart, 1965; was Formationand consisted of 62 The otoliths from the Woodring, 1966). species.

Cercado Formation indicateda shallow marine environment.

More precisely, 37 of the 44 taxa usable for palaeobathyme-

COMPARISONS TO OTHER OTOLITH FAUNAS OF THE try (84%) occur in waters from 0 to 100 m. Many of the

CARIBBEAN neritic taxa do not live at depths exceeding 50 m and at least

11 species are regular inhabitantsof euryhaline environments

estuaries. of the Although the number of described otolith assemblages from such as lagoons or None deeper-water taxa

several of them and all of them occur in neritic the Caribbeanis quite limited, are appropri- are exclusively bathyal may Labrisomusand the ate for comparison. An otolithassemblage from the Miocene areas. Several taxa, such as Holocentrus,

described Gillette the of reef environ- Gatun Formation in Panamawas in (1984). Dinematichthyini, suggest proximity

this identifications but the of the forms confined to shallow As noted earlier in paper, preliminary ments, majority are

the fauna neritic environments with rather soft bottoms & were done by the late John Fitch, but was never (Nolf

formally described. Approximately 900 kg of sample was Stringer, 1992). The otolith from the Bowden shell bed wet-sieved and yielded 2,074 otoliths. Twenty-six taxa were assemblage 154

compares most closely with the otolith fauna from the late most closely with the otolith fauna from the late Miocene

Miocene NN11 Zone in the Cercado Formation in the Do- NN11 Zone in the Cercado Formation in the Dominican

minican Republic. Although the Bowden otolith assemblage Republic described by Nolf & Stringer (1992). The most

is younger in age (Pliocene, probably around NN13-NN14), notable difference in the two assemblages is the larger

there are many similarities between the two assemblages. number of sciaenid species in the Cercado assemblage (six

Someof the similaritiesinclude the number of total species versus only two in the Bowden shell bed fauna).

for both faunas, the percentage of potential forms found in

the 0-100 m range is almost the same (approximately 80% ACKNOWLEDGEMENTS for both faunas), the number of euryhaline inhabitants is

about the same, the number ofshallow water taxa occurring A special thanks to Dr Dirk Nolf(Institut royal des Sciences on the shelf is similar, several taxa that suggest a reef envi- naturellesde Belgique, Brussels), who provided invaluable ronment are present in both faunas and deeper water forms assistance in numerous ways including taxonomic identifica- are mainly mesopelagic with no bathybenthic forms. Both tions, loaned material and suggestions for the study. Thanks assemblages containPlotosus, an Indo-Pacific catfish genus to all ofthe people who graciously provided otoliths from the which is interpreted as a relict element of the ancient western Bowden shellbed for research; Dr Harold Vokes, Dr Emily Tethys fauna. A significant difference in the Bowden shell Vokes, Mr Roger Portell and Dr Jon Bryan. Thanks to Dr bed and the NN11 Zone in the Cercado Formation is the Frank Pezold of Northeast Louisiana University (Monroe, number of sciaenids. The Bowden shell bed has only two Louisiana) for information on the bathymetry of Recent species of sciaenids while the Cercado has at least six sciae- fishes in the Gulf of Mexico. Thanks to the reviewers for nid species represented. their constructive critique of the manuscript. Special appre-

ciation is extended to Dr Stephen K. Donovan(University of

the West Indies, Mona) for his invitationto participate in this CONCLUSIONS of this project and for his advice regarding numerous aspects

study. His detailed editing of the draft manuscript was most A detailed study of approximately 1,650 fossil teleostean appreciated. otoliths from the type locality ofthe Pliocene Bowden shell

bed, Bowden Formation (Jamaica) revealed at least 38 teleost

families and 68 species. A definite correlation was found to REFERENCES exist between the sample size and the number of species

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PLATE 1

All in from the Pliocene shell bed. in each followed the specimens figured Pls 1-4 are Bowden Figure numbers plate are by taxonomic identifica-

view and collection number. Material from the Institute des tion, location ofthe otolith in the fish (right or left side), (inner, outer, ventral) royal

collection is in order and do not have individual Sciences naturelles de Belgique are designated as IRScNB; this arranged systematic specimens

collection numbers. Figured specimens from the Florida Museum of Natural History (University of Florida, Gainesville) have the prefix UF, Division of that The scale bar beside each otolith and are reposited in the Type and Figured Collectionof the Invertebrate Paleontology museum.

figured is equal to 1 mm.

1. face Fig. Albulasp., right sagitta, inner (IRScNB).

2. left Fig. Pythonichthys sp., sagitta, inner face (UF 78951).

Fig. 3. Ariosoma balearica (Delaroche, 1809), right sagitta, inner face (UF 78952).

Fig. 4. Rhyncoconger flava (Goode& Bean, 1896), right sagitta, inner face (UF 78953).

Fig. 5. Rhechias tysanochila (Reid, 1934), left sagitta, inner face (UF 78954).

6. left inner Fig. Polyipnus sp., sagitta, face (UF 78955).

inner face Fig. 7. Paraconger sp., left sagitta, (UF 78956). 157\1

PLATE 1 158\2

PLATE 2

PLATE 2

Fig. 1. Saurida caribbaeaBreder, 1927, left sagitta, inner face (UF 78957).

Fig. 2. Diaphus brachycephalus Taning, 1928, right sagitta, inner face (UF 78958).

Fig. 3. face Diaphus sp. 1, right sagitta, inner (IRScNB).

4. Fig. Bregmaceros sp., left sagitta, inner face (UF 78959).

5. left face Fig. Lobianchia sp., sagitta, inner (IRScNB).

Fig. 6. Lepophidium latesulcatum Nolf & Stringer, 1992, left sagitta, inner face (UF 78960).

Fig. 7. Otophidium robustum Nolf & Stringer, 1992, left sagitta, inner face (UF 78961). 159\3

PLATE3

PLATE 3

Fig. 1. Otophidium robinsi Nolf & Stringer, 1992, right sagitta, inner face (UF 78962).

2. Fig. Carapus sp., right sagitta, inner face (UF 78963).

inner face Fig. 3. Phthanophaneron sp., left sagitta, (UF 78964).

Fig. 4. Parascombrops cf. spinosus Schultz, 1940, left sagitta, inner face (UF 78965).

Fig. 5. Pristigenys cf altus (Gill, 1861), right sagitta, inner face (IRScNB).

6. Fig. Pristipomoides sp., left sagitta, inner face (IRScNB). 160\4

PLATE 4

PLATE 4

Fig. 1.Rhomboplites aurorubens (Cuvier, 1816), right sagitta, inner face (IRScNB).

face Fig. 2. Haemulon sp., right sagitta, inner (UF 78966).

Fig. 3. Protosciaena trewavasae (Chao & Miller, 1975), left sagitta, inner face (UF 78967).

Fig. 4. Lonchopisthus micrognathus Poey, 1861, right sagitta, inner face (UF 78968).

Fig. 5. Gobiidae sp. 1, right sagitta, inner face (UF 78969).

6. Gobiidae inner face Fig. sp. 3, right sagitta, (UF 78970).