Notes on some new or little known Rot$era from Brazil

Hendrik SEGERS, S. S. S. SAR&~A (1)

ABSTRACT

The fauna of fhree localities near Boa Vista (Roraima, Brazil) is studied. A total of 66 species is identified, 6’ of which are new to Brazil. Macrochaetus aspinus sp. n., M. americanus sp. n. and Trichocerca abilioi sp. n. are described. Lepadella latusinus Stri&a Koste, Dicranophorus halbac.hi Kosie and Trichocerca parvula Carlin are recognized as synonyms of L. c.ostatoides Segers, D. kostei Pourriot and Zoppi de Roa and T. rotundata Myers, respectively.

KEYWORDS : Rotifera - Brazil - New species - - Zoogeography.

NOTES SUR QUELQUES ROTIFÈRES NOUVEAUX ou PEU CONNUS DU BRÉSIL La présente contribufion concerne la faune de rotifères de trois localités dans les environs de Boa Vista (Roraima, Brésil). Au fatal, 66 espèces ont été identifiées, dont 6 nouvelles pour la faune brésilienne. Macrochaetus aspinus sp. n., M. americanus sp. II. et Trichocerca abilioi sp. n. sonl décrites. Lepadella latusinus striata Koste, Dicranophorus halbachi Koste et Trichocerca parvula Carlin sont reco-nnues comme synonymes de L. costatoides Segers, D. kost.ei Pourriot et Zoppi de Roa et T. r0tundat.a Myers, respectivement.

MOTS CLÉS : Rotifères - Brésil - Espèces nouvelles - Taxonomie - Zoogéographie.

RESUMEN

NOTAS SOBRE ALGUNOS ROTiFEROS NUEVOS 0 POCO CONOCIDOS DE BRASIL El estudio de 10s rotiferos de fres localidades de la region de Boa Vista (Roraima, Brasil) ha resultado en la idenfificaci& de 66 especies, de las cuales 6 son nuevas para Brasil. Tres nuevas especies han sido descritas : MacrochaetSus aspinus sp. n., M. americanus sp. II. y Trichocerca abilioi sp. n. Lepadella latusinus striata Koste, Dicranophorus halbachi Koste y Trichocerca parvula Carlin han sido reconocidas coma siminimos de L. costa- toides Segers, D. kostei Pourriot y Zoppi de Roa y T. rotundata Myers, respectivamente.

PALABRAS ~LAVES : Rotifera - Brasil - Nuevas especies - Taxonomia - Zoogeografia.

(1) Institufe of Ecology, K. L. Ledeganckstraat 35, B - 9000 Gent, Belgium.

R~U. Hydrobiol. irop. 26 (3) : 175-185 (1993). 176 H. SEGERS, S. S. S. SARMA

INTRODUCTION MATERIAL AND METHODS Neotropic Rotifera have been relatively well- Samples were collected by dragging a 50 prn st.udied, when compared to many other tropical plankton net through the littoral vegetati&i of seve- regions. Major contributions date as far back as ral water bodies in the region of Boa Vista, Roraima, 1913, when MURRAY published several papers on the Brazil (map 1). Of these, we were able to examine bdelloid (MURRAY, 1913 a) and monogonont (MURRAY, samples from three localities as listed below. 1913 b, c) of South America. Later, HAUER - Locality 1. Temporary lagoon, + 50 m long, (1956, 1964, 1965 a, 1965 b) and, especially, KOSTE 40 m wide, depth up to 1 m, about 5 km S. of Boa (1972, 1974, 1986, 1988, 1989), BRANDORFF et al. Vista, Roraima, Brasil, 24 June 1987. Conductivity (1982), KOSTE and ROBERTSON (1983), KOSTE et al. 5.7 PS ; 02 7.2 mg/1 ; TO (surface) 32.9 OC; pH 6.1. (1984), KOSTE and HARDY (1984), KOSTE and BOTTGER (1989) added signiflcantly to the knowledge - Locality 2. Permanent lagoon .along Rio of Brazilian Rotifera. Branco, about 7 km S. of Boa Vista, Roraima, Bra- sil, 24 June 1987. Conductivity 5.7 +S ; Os 7.1 mg/1 ; The relatively high number of endemic species and TO (surface) 36.6 OC; pH 5.3. the highly diverse rotifer taxocoenosis of its fresh- - Locality 6. Temporary inundation pond, of wat,er habit.ats offer an explanation for the lasting side st.ream of Rio Branca, near Mucajai, Roraima, attract.ivity of the region as subject for studies on Brasil, 24 June 1987. Conductivity 10.5 PS; 02 Rotifera. This is reflected in the large number of 6.1 mg/1 ; TO (surface) 36.4 OC; pH 4.0. recent contributions becoming available (e.g., BAT- TISTONI, 1992; KOSTE and B~TTGER, 1992; KOSTE Al1 samples are qualitative, and preserved in for- and ROBERTSON, 1990; KUCZYNSKI, 1991 a,1991 b; malin. Selection and study of rotifer specimens was NEUMANN-LEITAO, 1990; SAMANEZ, 1991; SEGERS ef done using a Ml0 dissecting microscope and a Medi- al., 1993 b; TURNER, 1990 a, 1990 b; TURNER and lux 12 (Kyowa) microscope. Drawings were made D4 SILVA, 1992). Nevertheless, still a lot remains to using a camera lucida. be discovered on the taxonomy, distribution and Type specimens are deposited in the Instituto ecology of these organisms, as illustrated here. National de Pesquisas da Amazônia, Manaus,

VENEZUELA

MAP 1. - Roraima State, Brazil, indicating the sampling stations. État de Roraima, Brésil, aoec localisation des stations de récolte. Rat. Hydrobiol. trop. 26 (3) : 175-185 (1993). NEW OR LITTLE KNOWN ROTIFERA (BRAZIL) 177

Brazil (I.N.P.A.), the Koninklijk Belgisch Instituut ** Lindia fuloa Harring and Myers : 2 voor Nat.uurwetenschappen, Brussels, Belgium Macrochaetus alfamirai (Arevalo) : 2 (K.B.I.N.), and the Institute of Animal Ecology, M. americanus n. sp. : 2 University of Gent,, Belgium (R.U.G.) M. aspinus n. sp. : 2 Al1 measurements are in p,rn. M. collinsi (Gosse) : 1, 2 fil. sericus (Thorpe) : 2 Monommata maculata Harring and Myers : 1, 6 RESULTS AND DISCUSSION Mytilina oentralis (Ehrenberg) (diverse formae) : 1 Notommata copeus Ehrenberg : 1, 2 A list of the monogonont, Rotifera identified from N. pachyura (Gosse) : 1 the samples examined is provided below, where Plationus pafulus (0. F. Miiller) : 2 numbers refer to the sampling station, * for species Polyarthra oulgaris Carlin : 1, 6 new to Brazil and ** indicates a species new to the Taphrocampa annulosa Gosse : 2 neotropics region. Testudinella emarginula (St.enroos) : I, 2 T. parua (Ternetz) : 1, 2 Asplanchna sieboldi (Leydig) : 1 7’. patina (Herman) : 2, 6 Cephalodella mira Myers : 1 Trichocerca abilioi n. su. : 1 C. mucronata Myers : 6 T. bicrisfata (Gosse) : i Colurella uncinata (0. F. Müller) f. bicuspidata T. pagellata Hauer : 1 (Ehrenberg) : 1 ** T. hollaerti De Smet : 2 Dicranophorus epicharis Harring and Myers : 2 T. longisefa (Schrank) : 2 D. kostei Pourriot and Zoppi de Roa : 1 T. porcellus (Gosse) : 2 ** D. prionacis Harring and Myers : 1, 2 T. pusilla (Jennings) : 1, 6 D. sebastus Harring and Myers : 6 ** T. rotundata M?ers : 2 Euchlanis incisa Carlin : 2 T. similis (Wierzejski) : 1, 2 Lecane arcula Harring : 2 L. braziliensis Segers-; 2 The samples cont.ained some contract.ed monogo- L. bulla (Gosse) : 2, 6 nont rotifers of the genera Cephalodella, Euchlanis, L. cornufa (0. F. Müller) : 1 Notommata and houles toget,her with many Bdelloi- L. crepida Harring : 1, 2 dea. Al1 of these were deformed beyond identifica- L. curuicornis (Murray) : 1, 2, 6 tion. L. decipiens (Murray) : 6 In total, 66 rotifer species were identifled from the L. dumonti Segers : 1, 6 three samples available. Four of these were not pre- L. eutarsa Harring and Myers : 1, 2 viously known, one of these, a Lecane, has been des- L. furcata (Murray) : 1, 2 cribed elsewhere (Segers, 1994). Four ot,her species L. haliclysta Harrmg and Myers :.6 have not been recorded from the neotropical region L. hamata (Stokes) : 1, 2, 6 before, one is new to Brazil. The most diverse genera L. hornemanni (Ehrenberg) : 1, 2, 6 were Lecane (39 %), followed by Trichocerca (13.6 %). L. inopinata Harring and Myers : 6 This confirms exist.ing knowledge on the composit,ion L. leontina (Turner) : 1, 6 of rotifer taxocoenosis in (sub)tropical littoral habi- L. ludwigii (Eckstein) : 1, 2, 6 tats (SEGERS et al., 1993 a). Most of the species recor- L. Zunaris (Ehrenberg) : 1, 2, 6 ded are common, cosmopolitic or pan(sub)tropical, L. monosfyla (Daday) : 2 probably warm-stenotherms and have already been L. nelsoni Segers : 1, 2, 6 recorded from the neotropical region (see KOSTE and L. obtusa (Murray) : 2, 6 JOSÉ DE PAGGI, 1982; KOSTE and BOTTGER, 1989: L. pertica Harring and Myers : 1, 6 Lecane sola Hauer from Ecuador). Surprisingly, onr L. pyriformis (Daday) : 1 record of Lepadella quadricarinafa (Stenroos) IS the L. rhenana Hauer : 2 first from t,he Neotropics. This widely distributed L. ruttneri Hauer : 6 species appears to be more common in temperate L. signifera (Jennings) : 1, 2, 6 regions. Some of the species found are confined to * L. sola Hauer : 2 the neotropical region; such are L. braziliensis Lepàdella acuminafa (Ehrenberg) : 6 Segers, L. eutarsa Harring and Myers and probably L. amphitropis Harring : 1, 2 L. nelsoni Segers, toget.her with two of the species L. costatoides Segers : 2. described below. D. sebastus and L. fuloa Harring L. cryphaea Harring : 2 and Myers are new world species which had not yet ** L. quadricarinata (Stenroos) : 2 been recorded from the neotropical region. L. quinquecostata (Lucks) (incl. f. chrisfineae Notes on the taxonomy and distribution of new or Koste) : 1 insufficiently known species are as follows. 178 H. SEGERS, S. S. S. SARMA

FAMILY TRICHOTRIIDAE trally) with small spinulets. Lateral margins of lorica smoothly rounded. Lateral, antero-vent,ral and Mucrochaetus umericunus n. sp. (figs la-b) antero-dorsal margins with rows of subequal spinu- lets, those on anterior margins smallest. Posterior TYPE LOCALITY margin with a pair of short, curved posterolateral Permanent lagoon of Rio Branco, about 7 km and a pair of stout posteromedian spines. Posterome- dian edge convex, bearing two small spinulets. Ven- S. of Boa Vist,a, Roraima, Brazil, 24 June 1987. C0nduct.ivit.y 5.7 pS ; 02 7.1 mg/1 ; TO (surface) tral lorica flat, dorsal lorica with terraced median 36.6 OC; pH 5.3. Leg. E. N. dos Sant.os-Silva. part, bearing two strong spines in anterior part. Lateral antennae in posterior region, on soc.le. Head MATERIAL EXAMINED when contracted tube-like with lateral folds, bearing the dorsal antenna and some relatively strong spinu- Female holotype (I.N.P.A. Rot-048), two female lets. Foot subterminally, partly covered, consisting paratypes (one K.B.I.N. I.G. 27989 R.I. 13, one in of a rigid, elongate distal foot pseudosegment on a R.IJ.G.). variably shaped, retractile basis. Two parallel-sided, equally long toes present. Posterior illoricate part of DIFFERENTIAL DIAGNOSI~ body (“ anal segment “) cont.ractile, bearing two The species cannot., by its single pair of dorsal pairs of spinulets, t.he median pair the longest. spines, be confused wit.h any c.ongener. The species is Mule : unknown. strikingly similar to M. danneeli Koste and Shiel, known from Aust.ralia (KOSTE and SHIEL, 1983) and MEASUREMENTS the Sout.h of India (F. K. KAKKASSERY, Ijers. Comm.) : bot.h have two pairs of short posterior Lorica length (of cont,racted specimens, caudal spines and a similar round lorica. M. danneeli is spines not included) 80-86, width 77-91. Dorsal spine reported to have only rudiments of dorsal spines length 21-24, posterior spine length 3-4 (external (” anterosubmedian ” spines, see KOSTE and SHIEL, pair) and 5-7 (interna1 pair). Foot pseudosegment 1983; WULFERT, 1964). The postero-lateral and pos- length 20, toe length 18-20. tero-median spines are slightly slenderer and more ETYMOLOGY elongate in M. danneeli than in M. americanus n. sp. The specific name americanus is an adjective, DESCRIPTION referring to the species’ area. Female : Contracted lorica almost circular, widest in post.erior t,hird, ent.irely covered (dorsally and ven- DISTRIBUTION AND ZOOGEOGRAPHY M. americanus n. sp. is SOfar only known from its type locality. The species may be a vicariant of the Oriental/ Australian M. danneeli.

Macrochaetus aspinus n. sp. (figs 2a-b)

TYPE LOCALITY Permanent lagoon of Rio Branco, about 7 km S. of Boa Vista, Roraima, Brazil, 24 June 1987. Conductivity 5.7 PS; 02 7.1 mg/l; TO (surface) 36.6 OC; pH 5.3. Leg. E. N. dos Santos-Silva.

la

FIGS la-b. - Macrochaetzzs americanus n. sp, a : dorsal view, b : foot, ventral view. Macroc.haetus americanus n. sp. a : eue dorsale, b : pied, rrue oentrale. FIGS 2a-b. - Macrochaefus aspinas n. sp. a : dorsal view, h : foot, ventral view. 1-l 50 c ~Iacrochaetus aspinus n. sp. a : ane dorsale, b : pied, eue urnfrafe.

Ree. Hydrobiol. trop. 26 (3) : 175-185 (1993). NEW OR LITTLE KNOWN ROTIFERA (~RA~IL) 179

MATERIAL EXAMINED FAMILY COLURELLIDAE Female holotype (I.N.P.A. Rot-049), two female paratypes (one K.B.I.N. I.G. 27989 R.I. 14, one in Lepadella costatoides Segers, 1992 ; new syuonym : R.U.G.). L. latusinus striata Koste, 1992

Recently, both Segers (in : SEGERS et al., 1992) DIFFERENTIAL DIAGNOSIS and KOSTE [in : KOSTE and BOTTGER, 1992 : Lepa- Although its lorica is entirely covered by minute della latusinus striata (KOSTE, 1991), sic !] recognised spinulets, M. aspinus lacks the large dorsal spines, and described a Lepadella having a dorsal lorica bea- characteristic of the genus. Only M. danneeli equally ring three pairs of longit.udinal ridges and having a lacks such dorsal spines, but this species has a dif- pair of acute postero-lateral projections on the foot ferent lorica shape and is armed with two pairs of aperture. The descriptions and figures by both caudal spines as in M. americanus n. sp. The t,otal authors clearly demonstrate that the same taxon is absence of any large spine is unique to M. aspinus being dealt wit,h, and that both names are syno- n. SP., which cari therefore not be confused with any nyms. congener. It is assigned to the genus Macrochaetus by A subspecificity of the taxon with L. latusinus is its characteristic lorica shape being covered entirely doubtfull, as the taxon was found in co-occurrence by minut,e spinulets, by the shape of its head and with L. latusinus americana Myers (KOSTE and foot when contracted, and by its trophi structure. BOTTGER, 1992). Moreover, it has already been recognised as a c.osmotropical, warm-stenothermic species (SEGERSet al., 1992; 1994). DESCRIPTION The description of Lepadella costatoides was publi- Female : Contracted lorica slightly longer than shed in October 1992, t.hat of L. latusinus striata in wide, broadest medially, ent,irely covered (dorsally December 1992. As a consequence, the former name and ventrally) with small spinulets. Lat,eral margins is the senior synonym and takes precedence over the of lorica smoothly rounded. Lateral, antero-ventral latter. and antero-dorsal margins with rows of subequal spi- nulets, those on anterior margins smallest. Ventral FAMILY DICRANOPHORIDAE lorica flat, dorsal lorica with terraced median part, with lateral ant.ennae in posterior region, on socle. Dicranophorus kostei Pourriot and Zoppi de Roa, Head when contracted tube-like with lateral folds, 1981; new synonym : D. haZbachi Koste, 1981 bearing the dorsal antenna and some relatively (figs 3a-g) strong spinulets. Posterior end of lorica with a cen- tral, projecting dome and lateral, rounded parts. In a sample from a temporary lagoon near Boa Subterminal foot partly covered, consisting of a Vista, we found several large Dicranophorus match- rigid, elongate distal foot pseudosegment on a varia- ing the descriptions of D. kostei Pourriot and bly shaped, retractile basis. Two tapering, equally Zoppi de Roa and of D. halbachi Koste. The animais long toes present. Posterior illoricate part of body are characterised by having extraordinarily long, contractile, covered with minute spinulets. parallel-sided toes with short basa1 sheaths as in Male : unknown. D. forcipatus (0. F. Müller), and by trophi as in figs 3a-c, having fused triangular or tooth-like pro- jections on the inner margins of the rami, and having MEASUREMENTS epipharyngeal plat,es (fig. 3b) as accessorial trophi Lorica length (of contracted specimens) 76-82, parts. width 72-76. Foot pseudosegment length 17, toe When comparing the ramus of specimens from dif- length 18-19. ferent origin, a striking variability is apparent. Remarkable differences are seen in size, shape of the tip and of the inner project.ions of the rami. ETYMOLOGY These projections were found to be symmetric,al in The name M. aspinus (adj.) refers to the species’ the paratype of D. halbachi, slightly asymmetrical in unique characteristic, i.e. the absence of any large our Brazilian material and slightly or strongly asym- spine. metrical in from different populations in Nigeria. KOSTE (1986) reports that the presence or absence DISTRIBUTION of epipharyngeal plat.es is the single diagnostic cha- M. aspinus n. sp. has only been rec.orded from it.s racter between D. kostei and D. halbachi Koste, des- type locality. cribed from Australia (KOSTE, 1981), but later also Rev. Hydrobiol. trop. 26 (3) : 17.5185 (1993). 1XC) H. SEGERS, S. S. S.. SARMA

3b

FI~;S Sa-g. - Dicranophorus kosfei, t,rophi. a : t,rophi (ventral view) ; b : epipharyngeal plat.es ; c : fulcrum (lateral view); d-g : right. ramus. d : parat.ype of D. halbachi; e, f : Nigerian specimens; g : Brazilian specimen. Dicranophorus kost,ei, frophi. a : frophi (eue rren- fraie) : b : plaques épipharyngéoles; c : fulcrum (rrue latérale) ; d-g : ramus droif. d : parafgpe rie D. halba- t------i 50 w chi; e, f : spt!cimens nigériens; g : spécimen brésilien.

recmrtlrd from Paraguay (KOSTE, 1986). Such plates, R.U.G.), one trophi preparation (R.U.G.). Several howrvrr, may have passed unmentioned, as by most specimens seen in samples from the Pant.anal region, authors (e.g., HARRING and MYERS, 1928), although Brazil (August 1955, leg. A. L. Oliveira-Neto), one they are present. in most large dicranophorids. Exa- specimen from lake Iyi-Efi, Nigeria (February 1991, mination of some phot.ographs, kindly placed at. our see SEGERS ef al., 1993 a) disposition by Prof. R. Pourriot, revealed the pre- sence of such plat,es in D. kostei. Examinat,ion of t.he DIFFERENTIAL DIAGNOSJS lrolot,ype and paratype incus of D. halbachi, deposi- Trichocerca abilioi n. sp. belongs to a group of ted in t.he Museum of the University of Kiel, Ger- elongate Trichocerca wit.h subequal tocs, SUC~ as many (Rot.. 76/77), and çomparison with other mate- T. tiyris (0. F. Müller), T. myersi (Hauer), T. scipio rial, revealed a synonymy between D. kostei and (Gosse), T. uaryai Wulfert. or T. kostei Segers. The D. halbachi. The record of Dicranophorus cf. halbachi disposition of the projections of the head aperture, from Nigeria (SEGERG et al., 1993 a) is hereby confir- wit.h its conspiçuous triangular ventral projection, med. D. kostei appears to have a pantropical distri- and t,he shape of its trophi easily distinguish t.he spe- but ion. cies. The external morphology of the Nigerian speci- As t.he description of D. kostei was published mens is ident,ical to that of the Brazilian mat,erial, during the second quarter of 1981 and that. of D. hal- their trophi have more acutely point#ed rami but are bachi during July 19S1, the former is t,he senior, otherwise highly similar. valid name of t.hr taxon. DESCRIPTION FAM JI,Y Female : Lorica (figs 4a, b) relat,ively stiff. Body elongate, slightly curved. Margins of head aperture ventrally with a broad-based, triangular projection, Trichocerca abilioi n. sp. (figs 4se) left-lateral side with a shallow median projection anterior of a short. striped field, right lateral side TYPE L~CALITY with inconspicuous t,rapezoidal striped field ven- Temporary lagoon along rio Brama, about 5 km trally. A shallow subdorsal keel on left side of body S. of Boa Vista, Roraima, Brasil, 24 ,June 1987. in anterior third, an elongate striped field subdor- C0nduct.ivit.y 5.7 PS; 02 7.2 mg/l; TO (surface) sally on right. side, reaching up t.o medially. Foot. 32.9 OC; pH 6.1. Leg. N. dos Santas Silva. short, terminal. Toes subdistally, held ventrally. Toes spiniform, curved proximally and distally, the MATERIAL EXAMINED right one about half as long as the left one. Each of Female holotype (I.N.P.A. Rot-047), three female these with two subst,yli of different, shape and length parat.ypes (one K.B.I.N. I.G. 27989 R.I. 15, two in near their basis. Openings of lat,eral antennae in dis-

I&V. Hydrobiol. trop. 26 (,3) : 175-185(1993). ïvEw 0~ LITTLE KWOWN ROT~~ERA (BRAZIL) 181

Suprauncus with antero-median row of short, fused teeth and rounded antero-lateral projection. Supra- ramus present. Right uncus and manubrium st.rong- ly reduced. M&e : unknown.

MEASUREMENTS Body 1engt.h 162-209 (198), height 39-54 (49), foot 1. 10-16 (16), trophus 1. 55-60 (57), right t,oe 1. 26-44 (42), left t,oe 1. 44-62 (broken) (measurement.s on Nigerian spec.imen bet.wrrn brackets). Fulcrum 1. 43-45, left manubrium 1. 40, left, ramus 1. (incl. alulus) 22-26, right ramus 1. (incl. alulus) 20-22.

ETYILIOLOGY The species is named after Abilio Lopez de Oli- veiro-Neto, who originally collectrd and rccognised the species as new.

T. nbi2ioi II. sp. occurs in South America (Brazil : type locality and several places in the Pantanal region), and in Africa (Nigeria).

Trichocerca hollaerti De Smet, 1990 (figs 5x-k)

COMMENT~

4d Trichocerca hollaerfi is an easily recognisable spe- cies which, according to DE SBIET (1990), cari be > c,onfused only with T. fZageZlatu Hauer (figs 6a-d). Both species have a similar head aperture, disposi- FIGS 4a-e. - Trichocerca abilioi n. sp. a, h : lateral views; tion of the toes and substyli and a generally similar c-e : trophi. c : ventral, d : lateral, e : dorsal view. trophi structure. They cari hardly be mistaken, Trichocerca abilioi n. sp. a, b : vues IatéraZes; c-e : trophi. considering that T. f2agellnfa has a shallow and short. e : me oentrale, d : latérale, e : dorsale. dorsal keel, a rounder lorica and a relatively long, smoothly curved left t.oe. Howevar, as T. hollaerfi is c,haracterised by having a lateral keel over thfi entire body, by a head aper- t.ure having longitudinal folds and by having a single ta1 part of body, the left more distally than the right,. elongate right, and a S-shaped, short left t.oe, it, Eye present.. resembles most T. lnphoessa (Gosse). They differ only Trophi (figs 4c-e) asymmetrical. Fulcrum elongat.e, by the struct,ure of t-heir t,rophi, that, of T. lophoessa with median antero-ventral crest and t,erminal basa1 has SO far only heerl figured by STETNBERGER (19%). plate. Left ramus with large, outwards directed alu- Especially its bifid left alulus and single-sided distal lus. Suprauncus wit,h rows of long, inwards-curved cruch of its left. manubrium dist inguishes teeth anteriorly on the ventral side, and a antero- T. lophoessa from T. holluerfi. la.teral spine. Supraramus present. Left uncus with T. hollaerfi has, aftrr its description from Zaire, single basa1 part, and fan-shaped distal part consis- been recorded from Nigeria (SEGERS ef al., 1992). The ting of 3-4 fused teeth. Left manubrium elongate, record of T. lophoessa from Madagascar (figs 5c, f-h ; widened proximally, distally with simple cruch. SEGERS, 1992) conctxrns a misidentified T. hollaerfi. Right ramus smaller than left, with straight alulus. The present, record ie the first outside Africa.

R~U. Hydrobiol. frop. 26 (.3) : 175-185 (I$$d). 182 II. SEGERS, S. S. S. SARMA

1-j 50 pm (5a-c) 1-l 25 pm (Sd-h)

FIGS 5a-h. - Trichocercahollnerti De Smet. a : late- rai view ; b : foot and toes, ventral view ; c : sub- vent.ral view ; d-h : trophi. d, f : ventral view, e, g : dorsal view, h : lateral view (c, f-h : Madagascan specimen). Trichocerca hol1aert.i De Smef. a : vue latérale; b : pied et orteils, vue venfrale; c : vue subvenfrale; d-h : frophi. d, f : vue ventrale, e, g : vue dorsale, h : vue laférnle (c, f-h : spécimen malgache).

Trichocerca rotundata Myers, 1937 ; new synonym : 1903 ?), but is distinguished by its smaller size and T. parvula Carlin, 1939 (Figs 7a-d) differently shaped trophi with simple left alulus (bifid in T. musculus and T. porcellus) and slightly COMMENTS differentiated terminal part of left manubrium (wit,h A single specimen of this rare species was found in strong distal crutch in T. musculus and T. porcellus). localitg 2 (see above). The spec.ies cari be confused Trichocerca rotundata appears to have been over- with T. porcellus (Gosse) and T. musculus Hauer (see looked by most, authors dealing wit.h the Palaearctic, KOSTE, 1978 ; e.g., Diurella porcellus after JENNINGS, fauna. The species has, after its description, only

Heu. Hydrobiol. frop. 26 (3) : 1%18~5 (1993). NEW OR LITTLE KN0wN R~TIFERA (BRAzIL) 183

6d

?a

FIGS Ga-d. - Trichocerca flagellafa Hauer. a : ven- tro-lateral view ; b-c : trophi. b : ventral, c : dorsal view ; d : left uncus. Trichocerca flagellata Hauer. a : vue venfro-latérale; b-c : frophi. b : vue ventrale, e : vue dorsale; d : uncus gauche.

FIGS 7a-d. - Trichocerca rofundafa Myers. a : left lateral view, b : foot and toes, right lat,eral view, c-d : trophi. c : ventral, d : dorsal view. Trichocerca rotundata Myers. a : vue laférale gauche, 1-1 50 pm (6a, 7a-b) b : pied et orfeil, vue laférale droite, c-d : frophi. c : vue 1-j 25 pm (6b-d, 7c-d) venfrale, d : vue dorsale.

been treated by NOGRADY (1979), who found the spe- ral, it appears, as,usual, to be the littoral rotifera in cies in Canada. Similar specimens have been recor- particular that are insufficient,ly known (SEGERS et ded and described from Europe under the name Tri- al., 1991 ; 1992). chocerca parvula Carlin. The synonymy of the two More and more evidenc.e becomes available t.hat follows from a comparison of the external morpho- illustrates a relation between the rotifer faunas of logy and trophi structure of T. parvula as reported the tropical region of South America and Afric.a. In by KOSTE (1978) and WULFERT (1940) wit,h the previous papers (SEGERS, 1994; SEGERS et al., report of T. rotundata by MYERS (1937) and 1993b), some taxa that either are known from both NOGRADY (1979), and of the present material. regions only (e.g., Lecane dumonti Segers), or, at least, have close relatives in both regions (e.g., L. nelsoni) were ident.ified. An additional example is described here (T. abilioi). These, together with a CONCLUSION further list of species, rec.orded from Africa and South America (Keratella americana Carlin, Lecane Our results demonstrate that the taxonomy of climacois Harring and Myers, L. decipiens [Murray], Brazilian Rotifera remains incompletely known, L. myersi Segers and Lepadella minoruoides Koste even though t.he region is the most intensively stu- and ROBERTSON : SEE SEGERS et al., 1993a),indicate died tropical count,ry. As a11species treated are litto- that the hypothesis of recent faunal exchange, for-

Rev. Hydrobiol. trop. 26 (3) : 175-185 (1993). 181 H. SEGERS, S. S. S. SARMIA

WCIF~~ hy SEGEHS et al. (1993 a) is prohably not t.he 0111~fact-or playing a role. It may be truc for an easlly recognizable, common American species as The second author acknowledges a grant. from t.he Belgian K. clmericana, tbat- has been found only once or Administration for Development & Cooperation, to attend the t-wice in thr old world, but cari hardly ac.count, for “ Int.ernat.ional Training Course on Lake Management. : the Zooplankton “, and Prof. 1.1. .J. Dumont. who enabled his pro- c.ases of spfacies as rare as L. dumonii, L. climacois, longed st.ay at. t.he 1nstit.ut.e of Animal Ecology, University of L. myersi, L. nelsoni, Lepadella minoruoides and Ghent, Belgium. We thank Prof. R. Pourriot for kindly provi- T. abilioi. -44t.least in some cases should the disjunct ding photographs of the t.ype of D. Izostei, and for his dist-ribution of these species be treated as demonstra- comments on the synonymy of D. kostei and D. halbachi. ting an ext.ant zoogeographical relation hetween the t.wo ragions. Manzzscrif accepté par le Comifë de rédaction le Ier novembre 1993

HEB’EHKNCES

B~TTISTC~NI (F’. A.), 1%@. - Cinco especies del género Nofho[ca KOSTE (W.), 1978. - Rotatoria. Die Rtidertiere Mitteleuropas. Gosse. 1886 (Rot.at,oria) de la Argentina, incluyendo Bornt.raeger, Berlin, 2 vols, 673 p., 231 plates. IV. @(foi sp. II. Iheringia, Sér. ZOO~., T3 : 35-45. KOSTE (W.), 1981. - Zur Morphologie, Systematiek und Oko- BRANDORFF (ci.-0.). KOSTE (W.), SMIRNOV (N. N.), 1982. - logie van neuen monogononten Radertieren (Rot.ato- Thr composit.ion and st,ructure of Rotiferan and Crust.a- rien) aus dem ~lberschwemmungsgebiet des Magela cean communities of t.he lower Rio Nhamunda, Amazo- Creek m der Alligat,or-River-Region Australiens, N.T. nas, Brazil. Sizzdies on Neofropical Fazzna and Environ- Teil 1. Osnabrücker naturzviss. Mitf., 8 : 97-126. ment, Ii : 69-121. KOSTE (W.), 1986. - tiber die Rotat.orienfauna in Gewassern (.L~HLIN (B.), 1939. - Über die Rotat.orien einiger Seen bei südost.lich von Concepcicin, Paraguay, Südamerika. Aneboda. Medd. Lunds Univ. Limnol. Inst., 2 : 3-68. Osnabriicker naturmiss. Mitt., 12 : 129-155. DE SMET (W. H.), l!M. - Contrihutinn t.o the rotifer fauna of the Bas-Zaïre. 2 - Species composition and seasonal KOSTE (W.), 1988. - ijber die Ratatorien einiger Stillgewasser abundance of rot.ifers in a shallow pond. Biol Jb. Dodo- in der Umgebung der Biologischen Station Panguana nara, 57 : W-77. im tropischen Regenwald in Peru. ~4mazoniancz, 10 : 303-325. H.\RRING (H. K.), MYERS (F. J.), 1928. - The Rotifer Fauna of Wisconsin. IV - The Dicranophorinae. Trans. Wis- KOSTE (W.), 1989. - Über Radertiere (Rot.atoria) aus dem consin .4cnd. Sri., Arts and letters, 23 : 667-808. Lago de Maraco, einem Ufersee des miMeren Rio Trombetas, Amazonien. Osnabrücker naturzviss. &fitf., HAIIEH (J.), 1956. - Rotat.orien aus Venezuela und Kolom- 15 : 199-214. hirn. Ergebnisse der deutschen Limnol. Venezuela-Expe- dition 19.52, 1 : 277-314. KOSTE (W.), B~TTGER (K.), 1989. - Rotat.orien aus Gewassern HAUER (J.), 1964. - Lecane remanei n. SP., eines neues Rader- Ecuadors. Ama~oniana, 10 : 407-438. ticr aus dem Amazonas-Gebiet. ZOO~. ;inz., 172 : 27-30. KOSTE (W.), B~TTGER (K.). 1992. - Rotatorien aus Gewassern HAUEH (J.), 1965 a. - Über einige im Stromgebiet des Amazo- Ecuadors II. .Imazoniana, 12 : 263-303. nas neu entdeckte Radertiere. Beitr. nafzzrk. Forsch. STV-Dezztschl., 24 : 41-46. KO§TE (W.), HARDY (E. R.), 1984. - Taxonomie studies and new dist.ribution records of Rotifera (Phylum Aschel- HAUF.R (J.), 1965 b. - Zur Rotatorienfauna des Amazonas- minthes) from Rio JatapB and Uatuma, Amazonas, gcbietes. Int. Reuzze ges. Hydrobiol., 50 : 341-389. Brazil. .4mazoniana, 11 : 17-29. JENNINGH (H. S.). l!M3. - Rotatoria of the Unit.ed States. KOSTE (W.), JOSÉ DE PAGGI (S.). lQ82. - Rotifera of t,he II - A monograph of t.he Rattulidae. Bull. U. 4’. Fish. Superorder recorded from Neotropis. Comm., 1902 : 273-352. Gewüsser und Abrv&ser, 68169 : 71-102. KOSTE (W.), 1972. - Rotatorien aus Gewassern Amazoniens. -ima:oniana, 3 : 258-505. KOSTE (W.), ROBERTSON (B.), 1983. - Taxonomie studies on the Rot.ifera (Phylum Aschelminthes) from a Central KOGTE (W.), 1974. - Zur Kenntnis der Rot.atorienfauna der Amazonian varzea lake, Lago CamaleBo (Ilha de Mar- ” Schwimmenden Wiese “, einer Uferlagune in der Var- chantaria, Rio Solim6es, Amazonas, Brasil). Amazo- zea Amazoniens, Brasilien. Amaioniana, 5 : 25-60. niana, 8 : 225-254.

Rea. liydrobiol. trop. 26 (3) : 175-185 (1993). NEW OR LITTLE KNOWN ROTIFERA (BRAZTL) 185

ICOSTE (W.), ROBERTSON (B.), 1990. - Taxonomie studies of SEGERS (H.), 1994. - On four new t.ropiral and subtropical the Rotifera from shallow wat.ers on t,he Island of Lecane (Lrcanidae, Monogononta, Rotifera). Hydrobio- Maraca, Roraim, Brazil. Amazoniana, 11 : 185-200. logis. 287 : 243-249.

KORTE (W.), SHIEL (R. J.), 1983. - Morphology, systematics SEGERS (H.), AJAYI (A. O.), CHIAMRENG (G. Y.), CHUAH (H. P.), and ecology of new monogonont, Rotifera (Rotatoria) DEL CASTILLO (M.), DIRECTO (M. G.), LUZURIAGA DE from the Alligator Rivers region, Northern Territory. CRUZ (M.), hfomïw (L.), OLIVEIRA-NETO (A. L.), RET- Trans. R. Soc. S. il&., 107 : 109-121. NANING WIIJYAFTUTI (Y.), 1991. - Fourteen rot.ifer species new t.o the Belgian fauna, with nomenclat.ural KOSTE (kV.), ROBERTSON (B.), HARDY (E.), 1984. - Further and taxonomical remarks on some Spuatinella-species. taxonomical studies of the Rot.ifera from Lago Cama- Belg. J. ZOO~., 121 : 193-201. lego, a Central Amazonian varzea lake (Ilha de Mar- chantaria, Rio Solimoes, Amazonas, Brasil). Amczzo- SEGERS (H.), EMIR (N.), MERTENS (J.), 1992. - Rotifera from niana, 8 : 555-576. nort.h and north-east Anatolia (Turkey). lfydrobiologia, KUCZYNSW (D.), 1991 a. - Rotifers from Reconquista River$ 245, 179-189. Argentina : the genus Brachionus, with descriptions of new species. Hydrobiologia, 215 : 135-152. SEGERS (H.), NWAUIARO (C. S.), DUMONT (fi. J.), 1993 a. - Rot.ifera of some lakes in the floodplain of the River KUCZYNSKI (D.), 1991 b. - Rotiferos del Rio Reconquista Niger (Imo State, Nigeria). II - Faunal composit,ion (Provincia de Buenos Aires, Argentina) : Familia Bra- and diversit.y. Hydrobiologia, 250 : 63-71. chionidae. Anals Soc. Cie&. Argentina, 221 : 65-80. SEGERS (H.), DOS SANTOS SILVA (E. N.). DE OEIVEIRA-NETO ~IURRAY (J.), 1913 a. - South American Rot.ifera. J. P. Micr. (A. L.), 1993 b. - New and rare species of Lecane and soc. : 229-246. Lepadefla (Rotifera : Lecanidae ; Colurellidae) from Brazil. Belg. .I. ZOO~., 123 : 113-121. MURRAY (J.), 1913 b. - South American Rotifera. Part. II. J. P. Micr. Soc. : 341-362. SEGERS (H.), SmhiA (S. S. S.), KAICKASSEHY (F. K.), NAYAR MURRAY (J.), 1913 c. - Sout.h American Rot.ifera. Part III. (C. K. G.), 1994. - New records of Rotifera from India. Conclusion. J. r. Aficr. Soc. : 449-454. Hydrobiologia, 287 : 251-258.

MYERS (F. J.), 1937. - Rot.ifera from t,he Adirondack region of STEMBERGER (R. S.), 1979. - A guide to rotifers of t.he Lau- New York. American Museum Novitates, 903, 17 p. rentian Great. Lakes. Environmental Monitoring and Support. Laboratory, Office of Research and Develop- NEUMANN-LEITAO (S.), 1990. - Estudos Taxonômicos dos ment,. U. S. Environmental Protection Agency, Cincin- Rotatoria da area estuarina-Lagunar de Suape, Per- nat.i, Ohio, 185 p. nambuco (Brasil). Trab. oceanog. Univ. Fed. Pernam- buco, 21 : 103-164. TURNER (P. N.), 1990 a. - Some rotifers from coastal lakes of NOGRADY (T.), 1979. - Canadian Rot,ifers. II - Park Mont. Brazil, with descript.ion of a new rotifer, Lepadella Tremblant, Quebec. Hydrobiologia, 71 : 35-46. (Xenolepadella) cczrrricaudata n. sp. Hydrobiologia, 208 : 141-152. POURRI~T (R.), Zoppi de Roa (E.), 1981. - Dicranophoridae (Rot.iféres monogonont.es) du Venezuela. Bull. Soc. Zool. TURNER (P. N.), 1990 b. - The rotifer genus Plafyias Harring France, 106 : 195-199. (1913), in the neot,ropics. Acfa LimnoI. Brasil., 3 : 741-756. SAMANEZ (I.), 1991. - Rotiferos planctonicos de Ia Amazonia Peruana II. Departamento de Loreto, Perti. Pub/. Mus. TURNER (P. N.), DA SILVA (C.), 1992. - Littoral Rotifers from Hist. nat. UNMSM (A), 38 : 1-4. the State of Mat,o Grosso, Brazil. Sfudies on Neofropical SEGERS (H.), 1992. - Taxonomy and zoogeography of the roti- Fauna and Environment, 27 : 227-241. fer fauna of Madagascar and t.he Comoros. J. .4fr. ZOO~., 106 : 351-361. WULFERT (K.), 1940. - Rotai.orien einiger osttleutsçher Torf- moore. Arch. Hydrobiol., 36 : 552-587. SEGERS (H.), 1993. - Rotifera of some lakes in the floodplain of the River Niger (Imo State, Nigeria). 1 - New spe- WULFERT (IC.), 1964. - Unsere gegenw$irt.ige Iienntnis der cies and othrr taxonomie considerations. Hydrobiologia, Rotat,oriengattung Macrochaetns Perty, 1850. Lirnnolo- 250 : 39-61. gica (Berlin), 2 : 281~309.

Reu. Hydrobiol. trop. 26 (3) : 175-185 (1993).