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A New Genus and Species of Buteonine Hawk from Quaternary Deposits in Bermuda (Aves: Accipitridae)

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A New Genus and Species of Buteonine Hawk from Quaternary Deposits in Bermuda (Aves: Accipitridae) PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 121(1):130-14L 2008. A new genus and species of buteonine hawk from Quaternary deposits in Bermuda (Aves: Accipitridae) Storrs L. Olson Department of Vertebrate Zoology, National Museum of Natural History, NHB MRC 116, Smithsonian Institution, P. O. Box 37012, Washington, D. C. 20013-7012, U.S.A., e-mail: [email protected] Abstract.•Bermuteo avivorus, new genus and species, is described from rare Quaternary fossils from the island of Bermuda. Although clearly referable to the Buteoninae, its relationships within that group are difficult to assess. Considerable size variation may be attributable to sexual dimorphism associated with bird-catching behavior. It is uncertain if the species survived into the historic period. Factors contributing to the rarity of hawk remains in the fossil record of Bermuda are discussed. One fragmentary ulna is from a larger hawk, possibly the Red-tailed Hawk Buteo jamaicensis. The isolated North Atlantic island of large dark herons, many very handsome Bermuda was once home to various sparrow-hawks, so stupid that we even species of endemic land birds, the number clubbed them" (Wilkinson 1950:56). The of which fluctuated between glacial peri- tameness presumably refers to both the ods of greatly increased land area and herons and the hawks and strongly certain interglacial periods when high sea- suggests a resident species of hawk levels caused extinctions through reduc- unaccustomed to humans or other pred- tion in land area (Olson & Hearty 2003, ators, rather than some migratory species Olson & Wingate 2000, 2001, 2006; Olson that would probably have been much less et al. 2005, 2006). The island also receives approachable. regular influxes of migrating birds from In 1610, William Strachy wrote of the American mainland. It would not "Hawkes of which in March wee found be unexpected, therefore, that there may diuers [diverse] Ayres, Goshawkes and have been an endemic raptor on the Tassels" (Lefroy 1981:35). "Ayres" could island that fed upon this regular and perhaps mean "eyries." "Tassel" is a probably abundant food source. Eight variant of "tercel" or "tiercel," applied species of North American hawks (Acci- to the smaller male of any species of pitridae) have been reported as vagrants falcon, but often used to mean any small to Bermuda (Amos 1991) of which only falcon. In this case, it could refer either to Circus cyaneus and Accipiter striatus the Merlin Falco columbarius or to the occur with any regularity. The others American Kestrel Falco sparverius, both are Elanoides forficatus, Haliaeetus leuco- of which are regular transients and cephalus, Accipiter gentilis, A. cooperii, winterers on Bermuda (Amos 1991:119). Buteo jamaicensis, and B. lagopus, as well If Ramirez indeed encountered a en- as a vagrant of the Old World eagle demic hawk, it must have disappeared Hieraaetus pennatus. soon thereafter, as one gathers from the In 1603, Diego Ramirez mentioned comments of Captain John Smith that that on Bermuda "There are many very there was no longer a resident hawk on VOLUME 121, NUMBER 1 131 the island in 1623: "Sometimes are also 621940 F Guyana; Geranospiza caerules- seene Falcons and Jar-falcon, Ospraies, a cens 345774 M Brazil; Harpagus bidenta- bird like a Hobby, but because they come tus 612259 F Panama; Hieraspiza super- seldome, they are held but as passengers" ciliosa 586298 F Guyana; Ictinia plúmbea (Lefroy 1981:330). 613357 M Panama; Leptodon cayanensis The numerous fossil deposits on Ber- 613953 M Panama; Leucopternis a. albi- muda (Olson et al. 2005) indicate a native collis 344057 M Venezuela; L. a. costa- hawk indeed existed on the island, yet ricensis 611558 M Panama, 613956 M remains of it are frustratingly few, even Panama; L. melanops 432181 F captive, after 25 years of collecting. The sample 621942 F Guyana; L. plúmbea 432154 M consists of but 7 bones (3 complete) from partial Panama; L. princeps 613281 M 4 or 5 localities that represent a minimum Panama; L. semiplumbea 613395 F Pan- of 6 individuals. ama; Parabuteo unicinctus 630259 M Comparative material examined (all Uruguay; Rostrhamus sociabilis 227376 USNM, M = male, F = female).• M Argentina; Rupornis magnirostris Accipiter cooperii 18855 F Maryland, 562526-8 MMM Panama, 630135 F 501627 M West Virginia, 614361 F New Uruguay. Mexico; A. striatus 554770 F North Carolina; Busarellus nigricollis 345772 F Systematics Brazil; Buteo albicaudatus 622367 F Guyana; B. albonotatus 621010 M Family Accipitridae Guyana; B. b. buteo 610637 M Sweden; B. b. vulpinus 558449 M South Africa; B. Accipiter differs from the Bermuda brachyurus 50938 unsexed partial Brazil, hawk in having the humérus with pectoral 291403 M partial Florida; B. j. jamaicen- crest larger and more triangular, with the sis 289619 F Haiti; B. j. borealis 561859 M apex situated more distally, the shaft Maryland; B. 1. lagopus 610370 F Sweden; more sigmoid, and the distal end relative- B. 1. sanctijohannis 291309 M Kansas; B. ly wider; the femur has the trochanter in n. nitidus 344055 M? Venezuela; B. n. external view truncate, less pointed, and plagiatus 288763 M Guatemala; B. p. the rotular groove is narrower. platypterus 321823 F captive, 613957 F In Circus, the humérus differs from Panama; B. p. brunnescens 500678 un- that of the Bermuda hawk in about the sexed partial Puerto Rico; B. p. insulicola same way as Accipiter, although the shaft 554967 M Antigua; B. poecilochrous is less sigmoid; the femur is more elongate 346398 M captive; B. polyosoma 319437 with the rotular groove narrower, as in M Argentina; B. regalis 320771 M New Accipiter, the tibiotarsus is much more Mexico; B. ridgwayi 318882 F Haiti; B. elongate and gracile. solitarius 610551 M, 622662 M, 622663 F The various New World "kites" (ex- all Hawaii; B. swainsoni 321986 M cepting Rostrhamus and Helicolestes) are California, 614363 F Colorado; B. ven- a heterogeneous assemblage but all have tralis 400056 M partial Chile; Buteogallus the feet less specialized for strong grasp- aequinoctialis 621054 F Guyana; B. an- ing than typical hawks and the hindlimb thracinus 562529 F Panama; B. gundlachii elements are smaller in proportion to 323421 M partial Cuba; B. meridionalis body size than in the Bermuda hawk. 622379 M Guyana; Chondrohierax unci- The Bermuda hawk clearly belongs natus 611557 F Panama; Circus cyaneus with the Buteoninae, which includes 291684 M Maryland; C. melanoleucus Buteo, Geranoaetus, Buteogallus, Harpy- 500257 M Russia; Elanus leucurus 19603 haliaetus, Leucopternis, and Parabuteo unsexed California; Elanoides forficatus (Lerner & Mindell, 2005), with Rupornis 132 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON {B. magnirostris) and Percnohierax (B. assigned with confidence to any existing leucorrhous) being split off from Buteo genus, a new genus becomes expedient but with Asturina (B. nitidus) included in until more specimens should indicate an the genus (Riesing et al. 2003). Raposo et alternative. al. (2006) have shown that Leucopternis is polyphyletic, with some species being Genus Bermuteo, new genus closer to Buteo and others to Buteogallus, Type species.•Bermuteo avivorus, new but insufficient taxon sampling makes it species. uncertain just what generic nomenclature Diagnosis.•Differs from all other gen- may emerge with further study. era of hawks examined in the head of the On modern geographic grounds, the femur, which is relatively smaller and not most likely progenitor of the Bermuda spherical and ball-like in all views but hawk would be a species of Buteo, the somewhat flattened proximo-distally, in only genus of the subfamily occurring on posterior view with the distal margin adjacent mainland North America. It nearly continuous with the posterior crest would not be unexpected, however, for of the neck (Fig. 1). The distinct wing-like almost any of the buteonine genera that process of the external condyle of the are currently Neotropical in distribution, femur in most Accipitridae is reduced in or nearly so, to have had a more northerly Bermuteo (also in Circus and Rostrha- distribution in the Pleistocene: viz. Para- mus). The available tibiotarsi are extreme- buteo, Buteogallus, Rupornis, Leucopter- ly robust by comparison with those in nis. It has long been established in the other buteonine hawks (Fig. 2). fossil record that many taxa of verte- Etymology.•An amalgamation of Ber- brates that are now restricted to the muda with the genus Buteo, from the Neotropics once occurred in eastern Latin word buteo, a hawk, used for the North America. In connection with Ber- European Buzzard Buteo buteo, and like muda, the endemic flightless rail Porzana that genus treated here as masculine in piercei was a direct descendent of the gender. Yellow-breasted Crake P. flaviventer, a species that now occurs no farther north Bermuteo avivofus, new species than Cuba and Hispaniola, suggesting Figs. 1-3, Table 1 that this species probably once occurred Holotype.•Complete left femur USNM on the mainland in eastern North Amer- 531932 (Fig. IB, D). Collected 15 Octo- ica (Olson & Wingate 2000). ber 2000 by S. L. Olson and P. J. The species currently placed in Buteo- Hearty. gallus (including Heterospizias meridiona- Type locality.•Bermuda, Hamilton lis) all have the tibiotarsus more elongate Parish, Admirals Cave, 32°21'05.6"N; and slender than in the Bermuda hawk 64°42'48.6"W (see Olson et al. 2005:227). (Olson 2006). Parabuteo differs in having Stratigraphy and age.•Level r of test the pectoral crest of the humérus much pit in large talus cone. Late Pleistocene, more triangular, the femur much more Marine Isotope Stage (MIS) 5e (=last robust, and the tibiotarsus much more interglacial), ca. 120,000 YBP (see Hearty elongated. After Buteogallus and Para- etal. 2004:1158). buteo have been eliminated from consid- Measurements of holotype (mm).•To- eration, it becomes more difficult to place tal length 55.4, proximal width 9.2, the Bermuda hawk, which is something of proximal depth 6.4, depth of head 3.9, a mosaic, although it has a few unique width and depth of shaft at midpoint 4.8 features in certain elements.
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