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Revision and Cladistic Analysis of Oligoxystre Vellard, 1924 and Description of a New Genus (Araneae; Theraphosidae; Ischnocolinae)

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Revision and Cladistic Analysis of Oligoxystre Vellard, 1924 and Description of a New Genus (Araneae; Theraphosidae; Ischnocolinae) Revision and cladistic analysis of Oligoxystre Vellard, 1924 and description of a new genus (Araneae; Theraphosidae; Ischnocolinae). José Paulo Leite Guadanucci A The family Theraphosidae is the largest sinonimy with Oligoxystre and transferred to within the Mygalomorphae spiders with more Barychelidae, subfamily Sasoninae since it than 800 species distributed in 8 subfamilies. shows the anterior maxilary lobe indistinct, The subfamily Ischnocolinae is considered a eye group wider than long and clipeus. taxonomic mess what makes it dificult the The taxa Holothele rondoni, Sickius determination of some genera. The longibulbi, Ischnocolus algericus and Gen.n.1 Ischnocolinae form a basal parafiletic group in form a monophiletic group different of that Theraphosidae (Raven, 1985) and it is the formed by the other genera (Gen.n.2 e subfamily that shows the broadest geographic Oligoxystre) considered Ischnocolinae. This distribution. Since the charater used to two genera formed a monophiletic group with diagnost this subfamily represents a Tapinauchenius sp, Pterinochilus sp, plesiomorphic state and it is present in all Avicularia avicularia, Euathlus vulpinus and juvenil Theraphosids, a lot of species Vitalius vellutinus. Although the taxons belonging to other subfamilies were included considered Ischnocoline formed two distinct within the Ischnocolinae. The lack of monophilect groups, it was prefered not to consistent sistematic studies envolving create a new subfamily since a lot of Ischnocolinae resulted a chaos in the representants of Ischnocolinae were not taxonomy of the group. available for this analysis. Therefore, the The cladistic analysis was done using 35 Ischnocolinae should sitll remain as morfologial characters and 20 terminal taxa. paraphiletic until monophiletic groups get Reichlingia annae (Barychelidae) and their status defined through cladistic analysis. Paratropis sp (Paratropididae) were used as out-groups. Genera belonging to distinct Palavras chave: Araneae, Mygalomorphae, Theraphosidae subfamilies were included in Theraphosidae, Ischnocolinae, Oligoxystre, the analysis: Pterinichilus sp (Harpactiriinae), Systematics, Taxonomy. Avicularia avicularia (Aviculariinae), Euathlus sp and Vitalius vellutinus UNIVERSIDADE DE SÃO PAULO (Theraphosinae), Holothele rondoni, Sickius INSTITUTO DE BIOCIÊNCIAS longibulbi and Ischnocolus algericus Guadanucci, José Paulo Leite (Ischnocolinae), besides Oligoxystre and two new genera. Revisão e análise cladística do gênero The genus Oligoxystre was revised and Oligoxystre Vellard, 1924 e descrição de um counts with 7 species, O. auratum, O. gênero novo (Araneae; Theraphosidae; bolivianum and 5 new species. This genus is Ischnocolinae). 102 páginas. monophiletic suported by the following sinapomorphies: labium wider than long and Dissertação (Mestrado) – Instituto de Biociências da Universidade de São Paulo. reduced number of cuspulas on the labium and Departamento de Zoologia. maxila. Orientador: Pinto-da-Rocha, Ricardo The species O. argentinense was transferred to a new genus named here as Gen.n.1, wich is monophiletic based on the following Descritores: 1. Araneae 2. Theraphosidae 3. sinapomorphies: reduced number of cuspulas Ischnocolinae on the maxila, tarsal claws with one line of I. Universidade de São Paulo. Instituto de Biociências. Departamento de Zoologia. teeth on the margin of the claw and less than a half of the metatarsus IV with escopula, and counts with more 3 new species. e-mail autor: [email protected] The monotipic genus Cenobiopelma, type- species C. mimetica, was removed from the http://www.biotaneotropica.org.br .
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