Speocarcinus meloi D’Incao & Silva, 1992

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 : 15-16

Speocarcinus meloi D’Incao & Silva, 1992

( Figs. 2 D; 3F; 5E; 6E)

Speocarcinus meloi D’Incao & Silva, 1992: 122 .

Speocarcinus meloi — Melo 1996: 416; 1998: 493; Souza 1997: 48; Rieger et al. 2003: 179; Bertini et al. 2004: 2200; Vezanni 2007: 104; Ng et al. 2008: 201; Brandão et al. 2010: 137.

Material examined. Holotype, male cl 12 mm, cw 15.6 mm ( MZUSP 9577), Brazil, Rio Grande do Sul, 32°17'S – 50°48'W, 14.xii. 1984, 82 m. Alagoas: Foz do Rio São Francisco, F/V Akaroa , st. 170, 10 °33’42’’ S– 36°16’30’’ W, 3.xii.1965, mud, 50 m: 1 male (DOUFPE 6099). Rio de Janeiro, Ilha Grande, R/V Emília , st. 137A, 4.vii. 1966, 29 m: 1 male ( MZUSP 9034). São Paulo, Ubatuba, Projeto Integrado, R/V Véliger II, st. 27, 23 °25' S– 44°52' W, 21.iv.1986, fine sand, 21 m: 1 male ( MZUSP 10930), Caraguatatuba, Biota Progresso, st. 17, iv.2001, 36.5 m: 1 male ( MZUSP 14320). Rio Grande do Sul, R/V Prof. W. Besnard, st. 313, 32 °45' S– 50°55' W, 26.vi. 1968, 78 m: 8 males ( MZUSP 35555), st. 378, 32 °15' S– 51°16' W, 24.viii. 1968, 57 m: 1 male ( MZUSP 3320); st. 379, 32 °32' S– 50°51' W, 24.viii. 1968, 70 m: 2 males ( MZUSP 3296), st. 421, 32 °53' S– 51°1' W, 3.xi. 1968, 68 m: 1 female ( MZUSP 4186), st. 425, 32 °8' S– 51°10' W, 4.xi. 1968, 57 m: 3 males, 2 females ( MZUSP 4070), st. 427, 32 °34' S– 50°29' W, 4.xi. 1968, 122 m: 1 female ( MZUSP 6137), st. 451, 32 °14' S– 50°40' W, 8.xii. 1968, 84 m: 1 male, 1 female ( MZUSP 3322), st. 451, 32 °14' S– 50°40' W, 8.xii. 1968, 84 m: 1 male, 1 female ( MZUSP 3323), st. 1662, 32 °20' S– 51°22' W, 21.i. 1972, 52 m: 1 male, 1 female ( MZUSP 9028), st. 1679, 30 °53' S– 50°16' W, 26.i. 1972, 60 m: 8 males, 6 females ( MZUSP 4073), st. 1697, 29 °30' S– 48°57' W, 30.i. 1972, 91 m: 10 males, 5 females ( MZUSP 6139), st. 1860, 30 °50' S– 50°06' W, 6.viii. 1972, 79 m: 2 males ( MZUSP 9029), st. 1907, 32 °07' S– 50°40' W, 21.viii. 1972, 91 m: 4 females ( MZUSP 13081), Projeto Crustáceos, 32°17'S – 50°48'W, 14.xii. 1984, 82 m: 1 fêmea ( MZUSP 9578), Torres, R/V Almirante Saldanha, st. 2234, 30 °37’ S– 49°59,6’ W, 18.x.1969, mud and sand, 71 m: 3 males (DOUFPE 6112), st. 2235A, 32°11’ S – 50°57,5’ W, 27.x.1969, mud and sand, 69 m: 9 males (DOUFPE 6100), st. 2236, 32 °12’ S– 50°40’ W, 27.x.1969, mud and sand, 82 m: 1 female (DOUFPE 6108); st. 1153: 2 males, 3 females ( MZUSP 8286); R/V Atlântico Sul, 32°17'S – 50°48'W, 14.xii. 1984, 82 m: 1 male, 1 female ( MZUSP 8605), 1 male, 1 female ( USNM 279079).

Type locality. Brazil, Rio Grande do Sul, 32°17'S – 50°48'W, 82 m.

Description. See D’Incao & Silva (1992).

Remarks. In some small males and females individuals of S. meloi the carapace anterolateral teeth may be very low and almost indistinct; the first (exorbital) and the second anterolateral teeth may be coalesced into a single lobe or fused basally only, in which case the exorbital tooth is acute, whereas the second anterolateral tooth is rounded at tip; the granulation density in the pterygostomian region is somewhat variable. The punctations and the rows of setae in the P1 propodus are more evident in small individuals than in larger ones.

Contrary to Brandão et al. (2010) the anterior margin of the sterno-abdominal cavity in S. meloi (fig. 5E) is more densely granular than in S. amazonicus (fig. 5A).

Distribution. Brazil (Alagoas, Rio de Janeiro, São Paulo and Rio Grande do Sul), in muddy sand bottoms, at depths between 21 and 122 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.