Chasmocarcinus hirsutipes Coelho & Coelho, 1998

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 21-22

Chasmocarcinus hirsutipes Coelho & Coelho, 1998

( Figs. 3 G; 21H; 29B; 36C, D; 49H; 65I)

Chasmocarcinus sp. C.— Coelho et al. 1980: 39, table III, appendix II [in list].— Barreto et al. 1993: 651 [in list]. Chasmocarcinus hirsutipes Coelho & Coelho, 1998: 804 , 813, figs. 5‒7 [type localilty: Brazil, Pará].— Coelho et al. 2008: 12 [in list].— Ng et al. 2008: 76 [in list].

Type material (not examined). Holotype male (DOUFPE 521); Brazil, Pará, Almirante Saldanha , stn 2476, 01°11’N, 47°05.5'W, 44 m.

Paratypes: 2 males (MZUSP 13607, ex-DOUFPE 514; see Melo et al. 2003: 431), Proj. Geomar, stn 46, 01°05’N, 47°42.4'W; specimens of unknown sex (DOUFPE 517, DOUFPE 518, DOUFPE 519).

Diagnosis. Anterolateral margins of carapace ( Fig. 3 G; Coelho & Coelho 1998: fig. 5a, b) with low granular ridge, setose dorsal surface. Orbits short, proportionally short eye peduncles ( Fig. 21 H; Coelho & Coelho 1998: fig. 5c, d). Antennular articles relatively short ( Fig. 21 H). Third maxilliped ( Fig. 29 B; Coelho & Coelho 1998: fig. 6e) ischium elongated, about same size as elongated merus. Bulging pterygostomial region, clearly visible from dorsal view. Fingers of major chela of holotype male ( Fig. 36 C; Coelho & Coelho 1998: fig. 6d, e) setose, proportionally short, slightly shorter than propodus in dorsal view; pollex as long as dactylus. Fingers of minor chela of holotype male ( Fig. 36 D; Coelho & Coelho 1998: fig. 6f) scissor-like; with small, sharp teeth. Inner margin of cheliped carpus with tooth ( Fig. 3 G; Coelho & Coelho 1998: fig. 5a). Ambulatory legs ( Fig. 3 G; Coelho & Coelho 1998: fig. 5a) setose, proportionally short; no subdistal spur on P5 dactylus. Fused thoracic sternites 1, 2 (Coelho & Coelho 1998: fig. 7a) broadly triangular, proportionally narrow, short. Male pleon ( Fig. 49 H; Coelho & Coelho 1998: fig. 7c) with proportionally long, narrow telson, nearly triangular in shape. G1 slightly slender, narrow at base, distal segment with spinules ( Fig. 65 I; Coelho & Coelho 1998: fig. 7d). G2, female pleon, thorax, vulvae undescribed.

Remarks. Although no material of this species was examined, the description of the species by Coelho & Coelho (1998) leaves little doubt that it is indeed a separate species on account of its setose carapace and pereiopods and tooth on the inner margin of cheliped merus ( Fig. 3 G; Coelho & Coelho 1998: fig. 5).

Distribution. Brazil (Amapá, Pará). Depth: 24‒77 m (Coelho & Coelho 1998).

Figures

FIGURE 3. Overall dorsal view of species of Chasmocarcinus. A, C. chacei, Gulf of Mexico: male 6.6 × 8.0 mm (USNM 61489); B, C. chacei, Gulf of Mexico: female 7.8 × 9.5 mm (USNM 61489); C, C. cylindricus, Jamaica: male 3.6 × 4.9 mm (USNM 42942); D, C. cylindricus, Puerto Rico: neotype female 4.6 × 6.1 mm (USNM 23765); E, C. cylindricus, Puerto Rico: female 6.9 × 9.2 mm (USNM 24551); F, C. gemmatus n. sp., Costa Rica: male 7.7 × 11.6 mm (SIO C 1205); H, C. hirsutipes, Brazil: holotype male 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 5 a).

FIGURE 21. Frontal view of cephalothorax of species of Chasmocarcinus. A, C. typicus, Trinidad: holotype male 7.8 × 8.7 mm (USNM 6901); B C. arcuatus, Brazil: male 5.7 × 7.7 mm (ZRC 2015.221); C, D, C. arcuatus, Brazil: male 3.7 × 5.1 mm (ZRC 2015.220); E, C. chacei, Gulf of Mexico: male 6.6 × 8.0 mm (USNM 61489); F, C. cylindricus, Puerto Rico: neotype female 4.6 × 6.1 mm (USNM 23765); G, C. gemmatus n. sp., Costa Rica: male 7.7 × 11.6 mm (SIO C 1205); H, C. hirsutipes, Brazil: holotype female 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 5 c).

FIGURE 29. Third maxilliped of species of Chasmocarcinus and Deltopelta n. gen. A, Chasmocarcinus gemmatus n. sp., Costa Rica: male 7.7 × 11.6 mm (SIO C 1205); B, C. hirsutipes, Brazil: holotype male 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 6 c); C, Chasmocarcinus latipes, Mexico: holotype female 12.4 × 14.4 mm (USNM 21592); D, Chasmocarcinus latipes, Ecuador: male 10.5 × 14.5 mm (AMNH 1941 - 10668); E, Chasmocarcinus latipes, Mexico: female 9.2 × 13.0 mm (AMNH 16262, holotype female of Chasmocarcinus ferrugineus Glassell, 1936); F, Chasmocarcinus longipes, Colombia: paratype male 5.5 × 6.4 mm (USNM 78785); G, C. meloi, Brazil: holotype male 5.3 × 6.2 mm (after Coelho & Coelho 1998: fig. 8 c); H, Chasmocarcinus mississippiensis, Gulf of Mexico: male 7.2 × 8.8 mm (USNM 101082); I, Deltopelta obliquus, Bahamas: holotype male 5.2 × 5.1 mm (USNM 20509).

FIGURE 36. Chelae of species of Chasmocarcinus. A, B, C. gemmatus n. sp., Costa Rica: male 7.7 × 11.6 mm (SIO C 1205); C, D, C. hirsutipes, Brazil: holotype male 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 6 e, f); E, C. latipes, Mexico: holotype female 12.4 × 14.4 mm (USNM 21592); F, C. latipes, Mexico: female 9.2 × 13.0 mm (AMNH 16262, holotype female of Chasmocarcinus ferrugineus Glassell, 1936); G, H, C. latipes, Ecuador: male 10.5 × 14.5 mm (AMNH 1941 - 10668); I, J, C. longipes, Colombia: paratype male 5.5 × 6.4 mm (USNM 78785).

FIGURE 49. Anterior thoracic sternum and male pleon of species of Chasmocarcinus. A, C. typicus, Trinidad: holotype male 7.8 × 8.7 mm (USNM 6901); B, C. typicus, Brazil: male 4.0 × 5.1 mm (MCZ CRU- 10993, holotype of Chasmocarcinus rathbuni); C, C. arcuatus, Brazil: male 5.7 × 7.7 mm (ZRC 2015.221); D, C. arcuatus, Brazil: male 3.7 × 5.1 mm (ZRC 2015.220); E, C. chacei, Gulf of Mexico: male 6.6 × 8.0 mm (USNM 61489); F, C. cylindricus, Jamaica: male 3.6 × 4.9 mm (USNM 42942); G, C. gemmatus n. sp., Costa Rica: male 7.7 × 11.6 mm (SIO C 1205); H, C. hirsutipes, Brazil: holotype male 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 7 c).

FIGURE 65. Gonopods of species of Chasmocarcinus. A ‒ D, C. latipes, Ecuador: male 10.5 × 14.3 mm (AMNH 1941 - 10668); E ‒ H, C. longipes, Colombia: paratype male 5.5 × 6.4 mm (USNM 78785); I, C. hirsutipes, Brazil: holotype male 6.6 × 7.0 mm (after Coelho & Coelho 1998: fig. 7 d); J, C. meloi, Brazil: holotype male 5.3 × 6.2 mm (after Coelho & Coelho 1998: fig. 9 e). A, E, ventral view of left G 1; B, ventral view of distal part of left G 1; C, F, dorsal view of distal part of left G 1; G, ventral view of tip of left G 1; D, H, left G 2; I, J, ventral view of right G 1. Scales: A, D = 0.5 mm; E, F, H = 0.25 mm; I ‒ K = 1.0 mm; B, C, G = 0.1 mm.