Oncopagurus, Lemaitre, 1996

Lemaitre, Rafael, 2014, A worldwide taxonomic and distributional synthesis of the genus Oncopagurus Lemaitre, 1996 (Crustacea: Decapoda: Anomura: Parapaguridae), with descriptions of nine new species, Raffles Bulletin of Zoology 62, pp. 210-301 : 214

Key to the Atlantic species of Oncopagurus

1. Ocular peduncle about half length of shield, cornea not dilated ( Fig. 1A ). .............................................................. O. africanus

– Ocular peduncle more than half length of shield, cornea at most weakly dilated................................................................2

2. Antennal acicle armed mesially with spines set at 90° angle (at least distally) to longitudinal axis of acicle; palm of right cheliped with mesial face concave and often expanded distomesially, ventromesial margin well delimited by row of spines ( Fig. 1K, L ).............................................. O. bicristatus

– Antennal acicle armed mesially with spines set at 45° angle to longitudinal axis of acicle; palm of right cheliped with mesial face not concave, ventromesial face rounded, without spinose margin ( Fig. 25A–D )............................................... O. gracilis

Figures

Fig. 1. A–I, Oncopagurus africanus (de Saint Laurent, 1972), paratype, male 5.2 mm, Angola (MNHN Pg 2689): A, shield and cephalic appendages, dorsal; B, carpus and chela of right cheliped, mesial; C, D, chela of same, dorsal (C) and lateral (D); E, dactyl of first left ambulatory leg, mesial; F, propodus and dactyl of right fourth pereopod, lateral; G, telson, dorsal; H, male sternite XIV, coxae of fifth pereopods, and first gonopods, ventral; I, male left second pleopod, posteromesial. J–T, Oncopagurus bicristatus (A. Milne-Edwards, 1880), J, L, M, P, male 3.1 mm, Straits of Florida (USNM 1100616); K, female 1.9 mm, Straits of Florida (USNM 1100616); N, O, R, S, male 3.0 mm, Caribbean Sea (UMML 32:4607); Q, male 4.4 mm Straits of Florida (UMML 32:4610); T, male 2.6 mm, Straits of Florida (USNM 1100615): J, shield and cephalic appendages, dorsal; K, carpus and chela of right cheliped of female, dorsal; L, carpus and chela of right cheliped of male, dorsal; M, right chela of same, lateral; N, dactyl of first left ambulatory leg, mesial; O, propodus and dactyl of left fourth pereopod, lateral; P, telson, dorsal; Q, male sternite XIV, coxae of fifth pereopods, and anterior portion of pleon with first and second gonopods, ventral. Scale bars = 2 mm (A, E); 3 mm (B–D); 1 mm (F, G, I); 2 mm (H); 1 mm (J, O, P); 2 mm (K–N); 2 mm (Q); 0.5 mm (R–T). [Adapted from Lemaitre (1989, 1990)].

Fig. 25. A–J, Oncopagurus gracilis (Henderson, 1888): A, male 5.5 mm, Straits of Florida, Bellows sta 78-8 (USNM 1100625); B, female 2.7 mm Caribbean Sea, Pillsbury, sta 610 (UMML 32: 4600); C, male 2.2 mm, SW Atlantic, Oregon sta 4226 (UMML 32: 4538); G–H, male 4.6 mm, Caribbean Sea, Oregon sta 4423 (UMML 32:4591); I, J, male 5.5 mm, SW Atlantic, Oregon sta 4226 (UMML 32: 4538): A, shield and cephalic appendages, dorsal; B-D, carpus and chela of right cheliped; E, right chela, lateral; F, dactyl of left first ambulatory leg, mesial; G, propodus and dactyl of left fourth pereopod, lateral; H, telson, dorsal; I, left first gonopod, mesial; J, left second gonopod, anterior. K–R, Oncopagurus haigae (de Saint Laurent, 1972): K–M, O–Q, male 4.2 mm, off Chile, USNS Eltanin, sta 71 (USNM 216289); N, male 3.9 mm, R, female 3.0 mm, off southern California, Albatross, sta 2935 (USNM 216289): K, shield and cephalic appendages, dorsal; L, N, carpus and chela of right cheliped, dorsal; M, chela, mesial; O, dactyl of right first ambulatory leg, lateral; P, propodus and dactyl of left fourth pereopod, lateral; Q, R, telson, dorsal; S, second pair of gonopods, lateral (right on right, left on left). Scale bars = 3 mm (A, F, K); 2 mm (B, C); 4 mm (D, E); 1 mm (H, G, P–R); 0.5 mm (I, J); 5 mm (L, N, O); 1 mm (S). [Adapted from Lemaitre (1989), and Lemaitre & McLaughlin (1992)].