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Issue: Vol. 2604 No. 1: 7 Sep. 2010
Type: Articles
Published: 2010-09-07
DOI: 10.11646/zootaxa.2604.1.4
Page range: 52–60
Abstract views: 53
PDF downloaded: 22

A new species of freshwater crab of the genus Allacanthos Smalley, 1964 (Crustacea, Decapoda, Pseudothelphusidae) from southern Costa Rica, Central America

Instituto Nacional de Pesquisas da Amazônia, Caixa Postal 478, 69011-970 Manaus, AM, Brazil
Instituto Costarricense de Electricidad-Proyecto Hidroeléctrico El Diquís. Puntarenas, Costa Rica
Museo de Zoología, Escuela de Biología, Universidad de Costa Rica, 2060 San José, Costa Rica Unidad de Investigación Pesquera y Acuicultura (UNIP) of the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, 2060 San José, Costa Rica
Crustacea taxonomy Costa Rica Central America Brachyura Potamocarcinini Neotropical region

Abstract

A new species of pseudothelphusid crab, Allacanthos yawi n. sp., from the Río Volcán drainage, Puntarenas Province, southern Costa Rica, Central America, is described and illustrated. This is the second species to be assigned to the genus Allacanthos Smalley, 1964. The new species is distinguished by its congener by having a first gonopod with a mesiolaterally flattened distal portion, a concave and nearly smooth subdistal portion of the lateral and cephalic sides, a narrow marginal process with a nearly straight distal border, and a lateral lobe with a sharp tip on the apex. An amended diagnosis for Allacanthos is provided.

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