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A New Species of the Genus Chelorchestia (Amphipoda, Talitridae) from Palma Island, Malaga Bay, Pacific Coast of Colombia

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A new species of talitrid amphipod, Chelorchestia colombiensis sp. nov., is described from the central zone of the Pacific coast of Colombia. Specimens examined were collected on the intertidal rocky shore associated with encrusting and filamentous algae. This new species of Chelorchestia differs from the other four described species, C. costaricana (Stebbing, 1906), C. vaggala (Bowman, 1977), C. darwinii (Muller, 1864), and C. forceps Smith & Heard, 2001 principally by the presence of well developed lobes on the ischium of the second gnathopod in males, as well as by the presence of two well developed rounded humps on the palm of the second gnathopod in males. Furthermore, variation was found in the length of antenna 2, uropod 1, uropod 2, and telson. Se describe una nueva especie de anfípodo talítrido, Chelorchestia colombiensis sp. nov., para la región central de la costa Pacífica colombiana. Los especimenes fueron colectados en la zona rocosa intermareal asociados a algas filamentosas e incrustantes. Esta nueva especie de Chelorchestia difiere de las otras cuatro especies descritas para el género, C. costaricana (Stebbing, 1906), C. vaggala (Bowman, 1977), C. darwinii (Muller, 1864), y C. forceps Smith & Heard, 2001, principalmente por la presencia de un lóbulo bien desarrollado en el isquio del segundo gnatópodo de los machos, y la presencia de dos tubérculos bien desarrollados en la palma del segundo gnatópodo de los machos. Adicionalmente, se encontraron diferencias en la longitud de la antena 2, urpodo 1, uropodo 2 y telsón.

Affiliations: 1: Grupo de Investigación en Ecología Animal, Universidad del Valle, Facultad de Ciencias, Departamento de Biología, A.A. 25360, Cali, Colombia;, Email: bellival@univalle.edu.co; 2: Grupo de Investigación en Ecología Animal, Universidad del Valle, Facultad de Ciencias, Departamento de Biología, A.A. 25360, Cali, Colombia

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