WILLIAMS: CRABS OF THE GENUS CALLINECTES 



ically. It suggests that the three west American 

 species, C. arcuatus, bellicosus, and tcxotes differ 

 appreciably from each other and that they arose 

 from eastern American ancestors. It also supports 

 the idea that most of the postulated "central" 

 species occur in the Atlantic and that "it is con- 

 ceivable that the group originated from an eastern 

 American ancestor." Beyond this the results are 

 less compatible with conclusions reached here, but 

 the analysis was done without including C similis 

 which may be a linking form that would have 

 changed the interpretation. 



SPECIES ACCOUNTS 



In the species accounts that follow, the 

 synonymies include only citations of works that 

 primarily are concerned with descriptive, tax- 

 onomic, or zoogeographic information. The reason 

 for this limitation is that commercially valuable 

 species often have a voluminous literature. All 

 inclusive synonymies for them become so un- 

 wieldy that the real purpose — taxonomic history 

 of the species — becomes obscured. The descrip- 

 tions also are limited because full descriptions are 

 elsewhere in the literature. 



Two features included in the descriptions need 

 clarification. The term "metagastric area" is em- 

 ployed for the central trapezoidal area of the 

 carapace in the sense Chace and Hobbs (1969) 

 used it rather than the term "intramedial area" 

 employed by others (cf. Rathbun, 1930; Williams, 

 1966). Strictly speaking, this region of the 

 carapace includes the undifferentiated metagas- 

 tric (over 90%) and at least part of the shortened 

 urogastric (less than 10% ) areas, but for all practi- 

 cal purposes the first term is sufficiently explicit. 

 The number of anterolateral teeth in Callinectes is 

 nine (Rathbun, 1930), but the first of the series is 

 also known as the outer orbital tooth and the last 

 as the lateral spine. This partition of the series is 

 observed here. The first and last teeth are always 

 named and the small teeth are numbered. 



Abbreviations adopted for institutions loaning 

 study material are: AHF, Allan Hancock Founda- 

 tion, University of Southern California; AMNH, 

 American Museum of Natural History, New York; 

 ANSP, Academy of Natural Sciences of Philadel- 

 phia; BMNH, British Museum (Natural History), 

 London; MCZ, Museum of Comparative Zoology, 

 Harvard; MNB, Museu Nacional, Rio de Janeiro; 

 MNHNP, Museum National d'Histoire Naturelle, 

 Paris; RMNH, Rijksmuseum van Natuurlijke 



Historie, Leiden; SADZ-B, Secretaria da Agricul- 

 tura, Departamento Zoologia, Sao Paulo; UNC- 

 IMS, University of North Carolina, Institute of 

 Marine Sciences, Morehead City; USNM, Na- 

 tional Museum of Natural History, Washington, 

 D.C.; YPM, Peabody Museum of Natural History, 

 Yale University, New Haven, Conn. 



Supplementary literature records are occur- 

 rences not represented by specimens studied, but 

 accepted on basis of supporting data. 



GENUS CALLINECTES STIMPSON, 



1860 



Callinectes Stimpson, 1860, p. 220 [92].- Rathbun, 

 1896, p. 349 (revision).- 1921, p. 394 (review of 

 African species).- 1930, p. 98 (review of West- 

 ern Hemisphere species).- not Chen, 1933, p. 95 

 (=Portunus?).- Monod, 1956, p. 204 (review of 

 African species).- Garth and Stephenson, 1966, 

 ^ p. 42 (review of eastern Pacific species). 



Description. — Portunid crabs lacking an inter- 

 nal spine on carpus of chelipeds. Abdomen of 

 males broad proximally, narrow distally, roughly 

 T-shaped; first segment broad, almost hidden; sec- 

 ond segment broad, slightly overlapping coxae of 

 fifth pereopods at each side; third-fifth segments 

 fused and tapering sinuously from broad third to 

 distally narrow fifth; sixth segment elongate and 

 narrow; telson ovate with acute tip. Abdomen of 

 females exhibiting two forms: immature females 

 with abdomen triangular from fourth segment to 

 tip of telson, segments fused; mature females with 

 abdomen broadly ovate (excluding telson), seg- 

 ments freely articulated; first segment almost 

 hidden; second and third segments slightly over- 

 lapping coxae of fifth pereopods at each side; fifth 

 and sixth segments with greatest sagittal length; 

 sixth segment narrowing distally in irregular 

 broad arc to articulate with triangular telson. Ab- 

 domen and telson of both sexes reaching an- 

 teriorly beyond suture between thoracic sternites 

 IV and V. 



Type species. — Callinectes sapidus Rathbun, 

 1896, by designation of International Commission 

 of Zoological Nomenclature (1964:336). 



Gender. — Masculine. 



Number of species. — Fourteen, which may be 

 distinguished by the following keys. 



719 



