New record of the genus Gracilimesus Kavanagh & Wilson, 2007 (Crustacea: Isopoda: Asellota) from Brazilian deep sea, with description of a new species

A new species of the genus Gracilimesus is described from Brazilian deep sea, with material collected from Alagoas-Sergipe, Espirito Santo and Campos Basins. The species has dimorphism sexual, common in the genus, males with anterolateral spines on pereonites I and IV and females with anterolateral spines on pereonite I only, shorter than spines observed on pereonite I of males. Diagnostic characters of the new species include: antennula with 5 articles, article 2 with 2 long simple dorsomedial setae and 1 simple lateral seta; pleotelson posterolateral margin, anterior to uropods, with pedestal spines: length approximately half uropod length, in females and males. The new species shares some characters with G. celticensis, but differs from it in having 2 long setae in article 2 of the antennula, not observed in G. celticensis; mouthparts less setose; pereonite IV with a short anterolateral spine, versus long in G. celticensis and pereopod I carpus and propodus ventral margin serrate. This is the first report of the genus Gracilimesus from Brazilian deep sea.