Tanaidacea from Brazil: III. new records and description of a new species collected from REVIZEE-NE Program

Catarina L Araújo-Silva,Kim Larsen

doi:10.1590/s0104-64972012000200002

Abstract

A new species of Paratanais Dana, 1852, Paratanais coelhoi sp. nov., is described and new records for Paradoxapseudes intermedius (Hansen, 1895), Intermedichelia gracilis Guţu, 1996, Vestigiramus sp., Nototanoides cf. trifurcatus Sieg and Heard, 1985, Biarticulata sp. and Arhaphuroides sp. are provided from northeastern Brazil based on collections from the REVIZEE-NE Program. This raises the number of tanaidacean species from the Brazilian coast from 45 to 49. Paratanais coelhoi sp. nov. shares morphological features such as habitus shape, maxilliped palp setation, and cheliped proportions with P. oculatus (Vanhöffen, 1914), P. martinsi Bamber and Costa, 2009, P. tara Bird, 2011 and P. euelpis Barnard, 1920. The new species can, however, be distinguished by a unique combination of characters including: pleonites 1-4 with lateral circumplumose setae while the 5th with simple seta only; antennule article 1 stout; cheliped propodus with one specialized outer 'S'-shaped broad seta; pereopod 1 merus length with 1.7 times as long as wide; pereopod 2 merus without ventral spiniform seta; uropodal endopod biarticulate, exopod uniarticulate as well as other characters.

Highlights

Among 45 species recorded from Brazil, only eleven were published from northeastern coast (Guţu, 1998 ; AraújoSilva and Larsen, 2012): Intermedichelia jesseri Araújo-Silva and Larsen, 2012, Leptochelia dubia (Krøyer, 1842), L. forresti
It is unlikely that so little tanaidacean diversity is present in this area, since the northeastern coast represents at least one-third of the entire Brazilian coast
Collections were made on northeastern coast (NE Score) along the continental shelf and oceanic banks of the Archipelago of Fernando de Noronha and North Chain Banks of Brazil

Summary

Introduction

While quite a number of taxonomic papers on the Tanaidacea of Brazil have been published (Krøyer, 1842; Mañé-Garzón, 1949; Lang, 1956; Silva-Brum, 1969, 1971, 1973, 1974, 1978; Băcescu, 1979, 1984, 1986; Masunari and Sieg, 1980; Sieg, 1983; Băcescu and Absalão, 1985; Guţu, 1996, 1998; Larsen, 1999; Santos and Pires-Vanin, 2006; Santos, 2007; Santos and Hansknecht, 2007; Larsen et al, 2009; Araújo-Silva and Larsen, 2012; Santos et al, 2012), most of species are described from southeastern Brazilian waters or deep-sea habitats. Article 2 about 0.4 times as long as wide, with two setulated setae on inner distal margin.

Results

Conclusion