New species aNd New records of Benthana Budde-LuNd , 1908 ( isopoda : oNiscidea : phiLosciidae ) from southerN BraziL

The genus Benthana includes 25 species with distribution in Brazil and Paraguay. In this paper we describe a new species from the state of Santa Catarina, southern Brazil, and provide new records for Benthana cairensis Sokolowicz, Araujo & Boelter, 2008, Benthana longicornis Verhoeff, 1941, Benthana moreirai Lemos de Castro, 1985, Benthana picta (Brandt, 1833), Benthana serrana Araujo & Lopes, 2003, and Benthana taeniata Araujo & Buckup, 1994. Key-Words: Crustacea; Terrestrial isopods; Neotropical; Atlantic forest.

The genus is characterized by the presence of the dentiform protrusion on the pleopod 1 exopod of male (Leistikow, 2001); additionally, in order to distinguish the species, two methods were proposed to analyze the appendage: the z:y ratio (see Araujo & Lopes, 2003), which classifies the exopod as elongated or rounded, and the levels of indentation (see Campos-Filho et al., 2013), which categorizes the indentation of the distal margin of the dentiform protrusion as low, medium or high.
Recently we examined material collected during expeditions in southern Brazil and material deposited in the Coleção de Carcinologia, Universidade Federal do Rio Grande do Sul, Porto Alegre and Museu de Zoologia, Universidade de São Paulo (MZUSP) and identified one new species from the state of Santa Catarina, and new records for six species of Benthana.

MATERIAL AND METHODS
Specimens were stored in 70% ethanol and descriptions were based on morphological characters.The specimens were dissected and the appendages and pereonites were mounted on slides.Drawings were prepared using a camera lucida.The noduli laterales were measured and illustrated as in Vandel (1962).The z:y ratio of the male pleopod 1 exopod was defined according to Araujo & Lopes (2003) and the indentation level of the dentiform protrusion was defined according to Campos-Filho et al. (2013).
The material was deposited in the Museu Nacional (MNRJ), Universidade Federal do Rio de Janeiro, Rio de Janeiro; Museu de Zoologia (MZUSP), Universidade de São Paulo, São Paulo; and Coleção de Carcinologia (UFRGS), Universidade Federal do Rio Grande do Sul, Rio Grande do Sul.
Description: Maximum body length 14 mm, cephalothorax width 2.5 mm.Light brown color.Cephalon with irregular unpigmented spots.Antenna with unpigmented proximal portion of the fourth article and distal portion of fifth article.Pereon with two lines of unpigmented longitudinal spots paramedially, a central line of unpigmented spots from the first pereonite to the fifth pleonite; epimera with large unpigmented spots.Telson with three unpigmented spots.
Antennule (Fig. 1I) triarticulate, distal article the longest, with 13 aesthetascs plus apical pair.Antenna (Fig. 1J) when extended posteriorly reaches fifth pereonite, flagellum triarticulate, first article longest, second and third subequal in length; apical organ short, one sixth of the length of the distal article, free sensilla inserted near the base.
Uropod (Fig. 2C) with protopod grooved on outer margin, endopod and exopod inserted almost at the same level, with few long setae along inner and outer margins; exopod slightly longer than endopod, with six setae on apex; endopod with three setae on apex.

:
Castro, 1958opod 1 exopod of Benthana carijos sp.nov. is similar to that of B. bocainensis Lemos deCastro, 1958, B. santosi Lemos de Castro,  1958 and B. schubarti Lemos de Castro, 1958, by the not prominent dentiform protrusion and low indentation, but can be distinguished by the absence of lobe on the inner margin (vs.present in B. bocainensis), and presence of setae on outer margin (vs.absent in B. santosi and B. schubarti).Benthana carijos sp.nov.can also be distinguished by the number of aesthetascs on the antennule(16+2 vs. 8+2 in B. bocainenis, 9+2  in B. santosi, and 6+2 in B. schubarti), uropod exopod slightly longer than endopod (vs.exopod twice as long as endopod in all three species), and the shape of the male pleopod 1 exopod with narrow distal third, an unique characteristic of this species.