Zootaxa, Nemesiidae (Araneae)

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Zootaxa 1088: 11–16 (2005) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA 1088 Copyright © 2005 Magnolia Press ISSN 1175-5334 (online edition) Description of a new genus of Nemesiidae (Araneae, Mygalomor- phae) from the Brazilian Cerrado RAFAEL PREZZI INDICATTI1, 2 & SYLVIA MARLENE LUCAS1 1Laboratório de Artrópodes, Instituto Butantan, Av. Vital Brasil, 1500, 05503-900, São Paulo, SP, Brazil. E- mail: [email protected], [email protected]. 2Programa de Pós-graduação em Biologia Animal, Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil. Abstract The new genus Longistylus of the family Nemesiidae is described from the Brazilian Cerrado. Longistylus ygapema n. sp. is recognized by the male palp with a globose bulb and a slender embolus, two times longer the palpal tibia, slightly curved retrolaterally and with no keels. Key words: Anaminae, Longistylus, Longistylus ygapema, spider taxonomy, Brazil Introduction The family Nemesiidae was proposed by Raven (1985) to include some genera transferred from Ctenizidae. To date, the family is divided in six subfamilies with 38 genera and 329 species, widely distributed worldwide (Platnick 2005). Twenty-six species from two subfamilies are presently known from Brazil: Pycnothelinae, with eight genera (Chaco Tullgren, Hermachura Mello-Leitão, Neostothis Vellard, Prorachias Mello-Leitão, Pselligmus Simon, Pycnothele Chamberlin, Rachias Simon and Stenoterommata Holmberg), and Anaminae, with two (Acanthogonatus Karsch and Hermacha Simon) (Raven 1985; Platnick 2005). In this paper we describe the new genus Longistylus, included in Nemesiidae due to the presence of two long biseriated superior claws (Goloboff 1995), absence of claw tufts, low caput, labium wider than large and apical segment of posterior lateral spinnerets triangular. Furthermore, the genus is tentatively placed in the subfamily Anaminae by the presence of whole scopulae on tarsi I–III and by the conformation of the male bulb (Raven 1985). The taxonomic placement of the genus will only be confirmed after a complete cladistic analysis, including the other genera of the family. Accepted by Peter Jäger: 9 Aug. 2005; published: 29 Nov. 2005 11.

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