Macrocoeloma subparallelum ( Stimpson, 1860 )

Parasram, Nadeshinie, Santana, William & Vallès, Henri, 2023, Checklist of the shallow-water marine Brachyura (Crustacea: Decapoda) of Barbados, West Indies, Zootaxa 5314 (1), pp. 1-62 : 18-19

Macrocoeloma subparallelum ( Stimpson, 1860)

( Figs. 8B–C )

Pericera subparallela Stimpson, 1860: 186 [type-locality: St. Thomas; type in USNM].

Pericera vilpini Desbonne in Desbonne & Schramm, 1867: 12, pl. 5, figs. 14, 15.

Macrocoeloma subparallelum . — Rathbun 1897: 7; 1901: 74. Nutting 1919: 75; Rathbun 1921: 87; 1925: 480, pl. 172; Abele & Kim 1986: 516; Melo 1996: 220, unnumbered fig.; Ng et al. 2008: 119; Lira et al. 2013: 54, tab. 1; García & Capote 2015: 9, figs. 4 e–f; Carmona-Suárez & Poupin 2016: 359, fig. 5H; González-Gómez et al. 2018: 11, tab. 1; Poupin 2018: 185.

Distribution. Western Atlantic: Cuba, Jamaica, Haiti, Puerto Rico, Gulf of Mexico, St. Thomas, Isla de Blanquilla, Venezuela, and Brazil ( Rathbun 1925; García & Capote 2015; Carmona-Suárez & Poupin 2016; Poupin 2018).

Material examined. Barbados, Shermans, St. Peter , subtidal, 13°16’07.25”N, 59°38’43.73”W, 1♀ CW: 17.6 mm ( BLSZ 164 ) . Reeds Bay, St. James , subtidal, 13°13’9.10”N, 59°38’32.44”W, 1Ô CW: 7.1 mm ( BLSZ 048 ) . Drill Hall , St. Michael, nearshore rubble, 13°4’36.30”N, 59°36’26.63”W, 1 ♀ (ovig.) CW: 25.4 mm ( BLSZ 047 ) . Idem , 1 Ô, CW: 22.6 mm ( BLSZ 046 ) . Idem , 2 Ô, 1 ♀ CW: 10.3, 10.6, 10.6 mm ( MZUSP 40888 , 40916 ) .

Remarks. Specimens of Macrocoeloma subparallelum were collected by hand in nearshore rubble habitat at low tide and caught in crab traps placed on sandy bottoms (~ 4 m deep) on the west coast of Barbados. One ovigerous female was collected in July 2019. Two colour varieties of Macrocoeloma subparallelum were collected by this study, the purple ( Fig. 8B ) and green variety ( Fig. 8C ). Rathbun (1921: 87) reported specimens of Macrocoeloma subparallelum (three females (one immature; one ovigerous), USNM 72864, 72865, 72882) for Barbados that were collected by the Barbados-Antigua Expedition in 1918. Macrocoeloma subparallelum can be identified by the shape of the rostral horns, which are subparallel and not fused at the base, the presence of a row of five spines in the posterior branchial region (not including lateral spines), and the presence of a spine on the dorsal surface of the carapace in the intestinal region (modified from Rathbun 1925).

Figures

FIGURE 8. Superfamily Majoidea Samouelle, 1819, dorsal habitus: A, Macrocoeloma nodipes (Desbonne in Desbonne & Schramm, 1867) (BLSZ 020); B, C, Macrocoeloma subparallelum (Stimpson, 1860) green variety, male, cw 22.6 mm (BLSZ 046); purple variety, female (ovig.), cw 25.4 mm, (BLSZ 047). Scale bars: 20 mm.