On the genus Elasmopus Costa, 1853 from the Northeastern Coast of Brazil with five new species and new records

Abstract

The genus Elasmopus is the most diverse in the Family Maeridae. Five new species and new records of Elasmopus from the Brazilian coast are herein described. The specimens were collected in intertidal and subtidal zones along the Northeastern Brazilian coast between 2010 and 2014. The distribution of Elasmopus longipropodus along the coast is extended. Eighteen species of Elasmopus are known from Brazil, not including these five new species. An identification key to the species of Elasmopus is provided.

The Unique Amphipoda and Tanaidacea (Crustacea: Peracarida) Associated With the Brown Algae Dictyota sp. From the Oceanic Trindade Island, Southwestern Atlantic, With Biogeographic and Phylogenetic Insights

“…nov. female differs from the former E. besnardi in several characters, including accessory flagellum 3-articulate, shorter than first proximal article of flagellum (vs. accessory flagellum 2-articulate, larger than first proximal article of flagellum), articles 2 and 3 of mandibular palp similar in length (vs. article 3 larger than 2), palm of gnathopods delimited by robust setae and length dactylus similar to palm (vs. not delimited palm and length dactylus shorter to palm); inner ramus of uropod 3 without robust setae on the inner margins (vs. inner margins with robust setae) and telson cleft about 1 /2 length (vs. telson totally cleft). Alves et al (2016) observed that the species of Elasmopus have some morphological patterns and therefore suggested the species separation into four groups, in which E. gabrieli sp. nov. can be placed in group 3, together with E. longipropodus Senna and Souza-Filho, 2011, E. rapax Costa, 1853, E. thalyae Gouillieux and Sorbe, 2015, E. thomasi Ortiz and Lalana, 1994, and E. yupanquii Alves et al, 2016, by having three palmar processes on gnathopod 1 of the male.…”