WILLIAMS: CRABS OF THE GENUS CALLINECTES 



•Guinea; Grand Lahou, Ivory Coast (Monod, 1956); 

 Gold Coast shelf (Longhurst, 1958); Fernando Poo 

 (Crosnier, 1964); 7°20'N, 12°39'W, Sierra Leone; 

 lagoon at Abidjan, Ivory Coast; Kribi, Cameroon; 

 Morro Peixe, Sao Tome (Forest and Guinot, 1966); 

 Cabinda, Luanda, and Baia do Lobito, Angola 

 (Guinot and Ribeiro, 1962). 



CALLINECTES ORNATUS ORDWAY 



Figures 6, 18d, 20d, 22d, 25 



Callinectes ornatus Ordway, 1863, p. 571 (syn- 

 types: labelled "types," 2 2, MCZ 5120, 

 Charleston, South Carolina; 1 <5, 2 9, MCZ 

 5128, Charleston, South Carolina; S [dry], 

 MCZ 5137, Gonaives, Haiti; i, MCZ 5136, 

 Cumana, Venezuela; those from Tortiigas 

 and Bahamas not found).-. Smith, 1869, p. 8.- 

 Rathbun, 1896, p. 356 (part), pi. 15; pi. 24, 

 fig. 3; pi. 25, fig. 2; pi. 26, fig. 2; pi. 27, fig. 2.- 

 1898, p. 596.- 1901, p. 48.- 1930, p. 114 

 (part), text-figs. 15b, 16a, 17a, 18b, pi. 50.- 

 1933, p. 48, fig. 40.- Young, 1900, p. 188 (var. 

 of C diacanthus) .- Verrill, 1908a, p. 366, 

 text-figs. 22c, 23b; pi. 17, fig. 1; pi. 21, fig. 3.- 

 Boone, 1927, p. 32.- Contreras, 1930, p. 232 

 (part), fig. 4.- Chace, 1940, p. 33.- 1956, p. 

 154.- Chace and Hobbs, 1969, p. 132, fig. 

 37e.- Balss, 1957, p. 1692 (part).- Holthuis, 

 1959, p. 200.- Guinot-Dumortier, 1960, p. 

 514, figs. 13a, b.- WiUiams, 1965, p. 172 

 (part).- 1966, p. 84, figs. lA, B, 4A, B.- Tais- 

 soun, 1969, p. 69, fig. 25A-D, photo 9.- 1973, 

 p. 22, figs. 4D, 5A, photo 1. 



Callinectes diacanthus.- A. Milne Edwards, 1879, 

 p. 225 (var. ofC. diacanthus).- Young, 1900, 

 p. 186 (part). 



Neptunus (Callinectes) diacanthus.- Ortmann, 

 1894, p. 77 (part; specimens c, k, n^, West 

 Indies; d, e, Brazil). 



Callinectes acutidens .- Boschi, 1964, p. 45, pi. 2, 

 figs, e, f, g; pi. 12, figs. 1, 2. 



TCallinectes humphreyi Jones, 1968, p. 187. 



Description. — Carapace (Figure 6) with lateral 

 pair of frontal teeth prominent but submesial pair 

 small, often almost completely rudimentary. 

 Metagastric area of adults not deeply sculptured, 

 anterior width about 2.8-2.9 times length, pos- 

 terior width about 1.75 times length. Antero- 

 lateral margins broadly arched, teeth exclusive 

 of outer orbital and lateral spine progressively 



more acuminate laterad; first five teeth with 

 posterior margins longer than anterior margins, 

 shouldered, distinctly separated by narrow-based, 

 rounded notches; last two teeth with margins ap- 

 proximately equal in length, separating notches 

 broad, next to last tooth distinctly more acumi- 

 nate than spiniform last one. Lateral spine trend- 

 ing forward. Surface of carapace with granula- 

 tions most prominent on anterior half and on 

 mesobranchial regions, granulations smaller and 

 more closely crowded on meso-metagastric and 

 cardiac regions, nearly smooth along posterolat- 

 eral and posterior borders. 



Chelipeds with smoothly granulated ridges on 

 chelae, carpus almost smooth dorsally, inferior 

 lateral ridge terminating in a low tooth occasion- 

 ally followed by an inconspicuous eminence. 

 Major chela usually with strong basal tooth on 

 dactyl and, especially in adult males, lower mar- 

 gin of propodal finger often decurved near base. 



Male abdomen and telson reaching beyond su- 

 ture between thoracic sternites IV and V, usually 

 with distal portions recessed below plane of ster- 

 num in retracted position; telson slightly longer 

 than broad with somewhat inflated sides; sixth 

 segment of abdomen relatively narrow, sides 

 slightly constricted, not parallel. Mature female 

 abdomen and telson reaching as far forward as in 

 male, telson as broad as long. First gonopods of 

 male (Figures 18d, 20d) reaching almost to suture 

 between thoracic sternites VI and VII, overlap- 

 ping each other completely near base but diverg- 

 ing distally and tapering to usually lanceolate 

 membranous tip; armed subterminally with short 

 retrogressive spinules quite visible at low 

 magnification, somewhat more numerous and 

 longer distally than proximally with tendency to 

 arrangement in rows near tip on ventral and me- 

 sial margin. Gonopores of females (Figure 22d) ir- 

 regularly ovate with apex on long axis directed 

 anteromesad; aperture of each irregularly and 

 broadly lunate, sloping from surface on mesial 

 side under rounded crenate anterior border and 

 rounded eminence on posterior border. 



Size of carapace in mm. — Largest male: length 

 60, width at base of lateral spines 105, including 

 lateral spines 130. Two largest females: length 58, 

 width at base of lateral spines 84, including lat- 

 eral spines 107 — length 69, width at base of lat- 

 eral spines 83, including lateral spines 99. These 

 two females demonstrate variability in mature 

 form that is characteristic of all species in the 



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