Pachygrapsus transversus en Isla de Pascua, ¿De qué especie estamos hablando? (Decapoda, Brachyura, Grapsoidea)

Abstract

Abstract.-Pachygrapsus transversus has been reported repeatedly at Easter Island, south Pacific, this species was registered in both side of America and in the West and East Atlantic and Mediterranean Sea. In a phylogeographic analysis, P. transversus is considered a species of the Atlantic Ocean and Pachygrapsus socius has been regarded as part of the Eastern Pacific fauna. At the same time, a review of the genus Pachygrapsus concludes that the species from Easter Island could be Pachygrapsus laevimanus. A recent paper about the phylogeny of the Grapsidae, reveal that the genus Pachygrapsus is polyphyletic, with just 5 species. In the same study is showed that P. laevimanus belong to genus Planes. Here we analyze the gonopods of the males of new material of this group from Easter Island, and compare with other species of genera Pachygrapsus and Planes. We conclude that the species in Easter Island belong to Planes laevimanus. Additional comparisons between species are given, as well as with genus Planes, sister group of Pachygrapsus.

Redescripción de <i>Percnon pascuensis</i> (Brachyura, Grapsoidea, Percnidae) de Rapa Nui

“…P. gibbesi y P. planissimum poseen una marcada similitud morfológica inclusive en la forma de los gonópodos. Los gonópodos de los braquiuros son un importante carácter para diferenciar entre grupos taxonómicos; especies de un mismo género tienden a tener gonópodos relativamente semejantes (Guzman & Olguin 2016), radicando las diferencias en pequeñas modificaciones morfológicas.…”