Known range. — Cape Hatteras, N.C., through 

 Gulf of Mexico and Caribbean area to Rio de 

 Janeiro, Brazil; Uha Trinidade off Brazil; Pa- 

 cific Ocean from region around Panama City; 

 Isla San Lucas, Costa Rica; off La Libertad, 

 Ecuador. 



Remarks. — A full review of this species has 

 been given by Haig (1956, 1960). Ovigenous fe- 

 males are known from the Caribbean area from 

 January to May, and from North Carolina and 

 the Gulf of Mexico from June to September 

 (Haig, 1956, 1960; Holthuis, 1959, in part). 



Rathbun (1926) described a fossil species, P. 

 avitus, from the Pliocene of Central America 

 which is similar to the recent P. galathinus. 



Genus Pachycheles Stimpson, 1858 



Stimpson, 1858, p. 228.— Haig, 1960, p. 131 (rev.). 



Pachycheles pilosus (H. Milne Edwards) 



Figure 84 



Porcellana pilosa H. Milne Edwards, 1837, p. 255. 

 Pachycheles pilosus: Haig, 1956. p. 11 (rev.). 



Recognition characters. — Carapace slightly 

 broader than long, flattened but somewhat more 

 convex from front to back than side to side, 

 lightly rugose along sides, with numerous short, 

 transverse tufts of setae except scattered setae on 

 frontal region. Frontal margin sinuous, slightly 

 produced in middle, with a submarginal row of 

 stout setae. Anterolateral margins emarginate. 

 Epimeral pieces of metabranchial regions sepa- 

 rated by membranous interspaces, posterior por- 



Figi re 84. Pachycheles pilosus (Milne Edwards). Ani- 

 mal in dorsal view, second, third, ami fourth leg of lefl 

 side not shown, 5 mm. Indicated. 



tion consisting of one or more pieces. Orbits 

 deeply excavated, postorbital angle spiniform; 

 eyes short, stout. Antenna with first movable 

 article bearing a buttressed spine on anterior mar- 

 gin; second article with a spine near middle of 

 anterior border; third article short, smooth. 



Chelipeds unequal, stout, ornamented with 

 numerous, long, dark setae with shorter ones be- 

 tween; merus outlined dorsally with long setae, a 

 stout spine and large white tubercle at inner distal 

 angle; carpus with a number of prominent white 

 tubercles on proximal portion, anterior border 

 with about three spines; hand inflated, outer mar- 

 gin spined and tuberculate below and at base of 

 immovable finger, fingers short, immovable finger 

 with a single blunt tooth on cutting edge, inner 

 edge of hand and dactyl with obsolescent spines. 

 Walking legs with hairy covering similar to che- 

 lipeds, a few spines below on dactyls and propodi. 



Telson of males and females with five elements. 



Measurements. — Length of carapace: males, 7 

 mm.; ovigerous females, 5 to 7 mm. (Haig, 1956). 



Habitat. — In corals; to 4 fathoms (Schmitt, 

 1935a). 



Type locality. — Vicinity of Charleston, S.C. 



Known range. — Charleston, S.C. ; Key West to 

 Sarasota Bay, Fla. ; through West Indies to To- 

 bago and Aruba. 



Remarks. — Ovigerous females have been taken 

 in the West Indies from February to May (Haig. 

 1956, in part). Rathbun (1926) reported a Plio- 

 cene species of Pachycheles from Central 

 America. 



Pachycheles rugimanus Milne Edwards 



Figure 85 



Pachycheles rugimanus Milne Edwards, 1880, p. 36. — Hay and 

 Shore, 1918, p. 404, pi. 29, fig. 2.— Haig, 1959, p. 12 (rev.). 



Recognition characters. — Carapace slightly 

 longer than wide except in mature females, flat 

 from side to side, convex from front to back, ru- 

 gose along sides; anterolateral margins emargi- 

 nate; epimeral pieces of metabranchial regions 

 separated by membranous interspaces, posterior 

 portion consisting of one or more pieces. Front 

 broad, frontal margin projecting downward, 

 slightly produced in middle, hardly visible from 

 above. Orbits deeply excavated, margins slightly 

 raised, postorbital angle spini form : eyes short, 

 stout, retract ile. Antenna with first movable 

 art icle bearing a serrate spine on anterior margin : 



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