Resumo

SALGADO-BARRAGAN, José. A new species of Pinnixa (Crustacea: Brachyura: Pinnotheridae) from Mazatlan, Sinaloa, Mexico. Rev. Mex. Biodiv. [online]. 2015, vol.86, n.3, pp.629-633. ISSN 2007-8706.  https://doi.org/10.1016/j.rmb.2015.03.001.

A new pinnotherid crab, Pinnixa hendrickxi n. sp., is described from Isla de la Piedra, Mazatlán, Sinaloa, Mexico. The new species can be distinguished from most species of Pinnixa of the Eastern Pacific because males have an abdomen narrowed medially and widened distally. However, due to this characteristic, P. hendrickxi resembles P. darwiniGarth, 1960, P. plectrophorosGlassell, 1935, P. transversalisMilne-Edwards & Lucas, 1842, and P. bahamondeiGarth, 1957 from the eastern Pacific and P. faxoniRathbun, 1918, from the western Atlantic. Pinnixa hendrickxi can easily be distinguished from P. plectrophoros and P. transversalis by the absence of spines on third and fourth legs. On the other hand, the new species can be separated from P. transversalis , P. bahamondei , and P. faxoni by the absence of dorsal ridges on the carapace. It can be distinguished from P. darwini by the fingers of the chelae (which, when closed, leave a gap in P. darwini , but close almost completely in the new species), the exopod of the third maxiliped with a non-segmented flagellum in the new species, and first pleopod with slender terminal process and without bulbous subterminal swelling in the new species.

Palavras-chave : Brachyura; Pea crabs; New species; Taxonomy; Mexican Pacific.