Alpheopsis trigona ( Rathbun, 1901 )

Soledade, Guidomar O., Fonseca, Mytalle S. & Almeida, Alexandre O., 2015, Shallow-water stenopodidean and caridean shrimps from Abrolhos Archipelago, Brazil: new records and updated checklist, Zootaxa 3905 (1) : -

Alpheopsis trigona ( Rathbun, 1901)

( Fig. 3 A)

Material examined. 1 female, Ilha de Santa Bárbara (17°57’49”S 38°41’53”W), coll. G.O. Soledade, 22.viii.2013, intertidal, under rocks, UESC 1549.

Distribution. Western Atlantic—Bermuda to Barbados and West Indies to Yucatan Peninsula and Brazil (Fernando de Noronha Chain, Ceará, Paraíba, Bahia) ( Chace 1972; Coelho Filho 2006; this study).

Previous records from Abrolhos. None.

Remarks. Alpheopsis trigona is possibly a species complex ( Anker 2001). The species was previously recorded from northeastern Brazil, however, only in a general list of decapod crustaceans obtained during the REVIZEE campaigns ( Coelho Filho 2006), i.e. without morphological description or illustrations of diagnostic characters. The single female specimen from the Abrolhos was identified as A. trigona based on the tricarinate carapace and with nine sharp longitudinal or oblique crests and chelae distinctly triangular in cross section. The color pattern of the Brazilian specimen ( Fig. 3 A) corresponds well to that of a Bermuda specimen in Sterrer (1986). The southern distribution limit of A. trigona is extended from Paraíba (06°51’S 34°7’W) to Ilha de Santa Bárbara (17°57’49”S 38°41’53”W).

Figures

FIGURE 3. Some caridean (alpheid) shrimps from Ilha de Santa Bárbara, Abrolhos, Bahia, Brazil: A, Alpheopsis cf. trigona (Rathbun, 1901); B, Alpheus bouvieri A. Milne-Edwards, 1878; C, Alpheus carlae Anker, 2012; D, Alpheus formosus Gibbes, 1850; E, Alpheus verrilli (Schmitt, 1924); F, Automate cf. rectifrons Chace, 1972; G, Synalpheus cf. brevicarpus (Herrick, 1891); H, Synalpheus fritzmuelleri Coutière, 1909. Scale bars = 5 mm.