Speocarcinus monotuberculatus Felder & Rabalais, 1986

Brandão, Marianna, Coelho-Filho, Petronio Alves & Tavares, Marcos, 2012, A review of the genus Speocarcinus Stimpson, 1859 (Crustacea: Brachyura: Xanthidae), with a key to its species and the description of one new species, Zootaxa 3327, pp. 1-19 : 16

Speocarcinus monotuberculatus Felder & Rabalais, 1986

( Figs. 2 G)

Speocarcinus monotuberculatus Felder & Rabalais, 1986: 561 .

Speocarcinus monotuberculatus— Ng et al. 2008: 201; Thoma et al. 2009: 559; Brandão et al. 2010: 137; Lai et al. 2011: 442.

Material examined. Holotype, female cl 6 mm, cw 7.8 mm ( USNM 228459), Texas, Gulf of Mexico, Southern Bank, 27°33'02”N – 96°29'03”W, 6.vii. 1976, 76 m; Hospital Rock, 27°26'49”N – 96°31'18”W, 1977, 81 m: 1 juv. male, 1 female paratypes ( USNM 228460) [judging from the labels, the locality and depth of the holotype and paratypes were switched in the original description].

Type locality. Texas, Gulf of Mexico, Southern Bank, 27°33'02”N – 96°29'03”W, 76 m.

Description. See Felder & Rabalais (1986).

Remarks. The G1 has never been documented in S. monotuberculatus , as the abdomen is lacking in the only known male specimen of this species (the juvenile USNM 228460). Otherwise, S. monotuberculatus was described and illustrated in great detail by Felder and Rabalais (1986). The species can be readily distinguished from all other species in the genus by having one dorsal median tubercle on both male and female abdominal segment 2.

Distribution. Texas, Gulf of Mexico, in soft bottoms between 76 and 81 m.

Figures

FIGURE 2. A – B, Lateral view of right and left chelipeds, respectively. C – H, Habitus, dorsal view. A, C, Speocarcinus amazonicus Brandão, Tavares & Coelho-Filho, 2010, holotype male cl 8 mm, cw 11 mm (MZUSP 23654). B, D, Speocarcinus granulimanus Rathbun, 1894, lectotype male cl 17.5 mm, cw 21 mm (USNM 17461). E, Speocarcinus lobatus Guinot, 1969, holotype male cl 16 mm, cw 12 mm (USNM 101081). F, Speocarcinus meloi D’Incao & Silva, 1991, holotype male cl 12 mm, cw 15.6 mm (MZUSP 9577). G, Speocarcinus monotuberculatus Felder & Rabalais, 1986, holotype female cl 6 mm, cw 7.8 mm (USNM 228459). H, Speocarcinus spinicarpus Guinot, 1969, male holotype cl 16 mm, cw 19 mm (USNM 231701). Note the differences in the chelipeds inner carpal spines. Scale bars: C – F, H, 10 mm; G, 2.5 mm.