Navegando por Palavras-chave "Gymnophthalmidae"

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    Molecular phylogeny, biogeography and insights into the origin of parthenogenesis in the Neotropical genus Leposoma (Squamata: Gymnophthalmidae): Ancient links between the Atlantic Forest and Amazonia
    (Elsevier B.V., 2011-11-01) Pellegrino, Katia C. M. [UNIFESP]; Rodrigues, Miguel T.; James Harris, D.; Yonenaga-Yassuda, Yatiyo; Sites, Jack W.; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP); UP; Brigham Young Univ
    Leposoma is a conspicuous component of leaf litter herpetofauna of South and Central American rainforests. the 15 bisexual and one parthenogenetic species are allocated to the parietale and scincoides groups based on morphology. Phylogenetic analyses of 1830 bp (mtDNA + nuclear) were performed on 63 specimens of four species from Amazonian and Panamanian rainforests, and six species and one undescribed form from the Atlantic Forest. Different methods of tree reconstruction were explored, with Anotosaura vanzolinia and Colobosauroides cearensis as outgroups. the monophyly of the parietale and scincoides groups is strongly supported. Contrary to previous hypotheses suggesting a recent contact between Atlantic and Amazon forests, our estimates point to an initial split in Miocene. the position of Leposoma baturitensis, endemic to relictual forests in the semiarid Caatingas northeastern Brazil, and its divergence from the remaining species of the Atlantic Forest, suggests an ancient isolation with no indication of a secondary contact with forests of the eastern coast. Our data do not permit unambiguous assignment of parental species of the unisexual Leposoma percarinatum or the mechanism involved in the origin of parthenogenesis, but revealed two highly divergent diploid and triploid lineages within L percarinatum, indicating that the unisexuals represent a species complex. (C) 2011 Elsevier Inc. All rights reserved.
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    A new species of Leposoma (Squamata: Gymnophthalmidae) with four fingers from the Atlantic Forest central corridor in Bahia, Brazil
    (Magnolia Press, 2013-03-28) Rodrigues, Miguel Trefaut; Teixeira, Mauro; Recoder, Renato Sousa; Dal Vechio, Francisco; Damasceno, Roberta; Machado Pellegrino, Katia Cristina [UNIFESP]; Universidade de São Paulo (USP); Univ Calif Berkeley; Universidade Federal de São Paulo (UNIFESP)
    Leposoma sinepollex sp. nov., a new species of the scincoides group, is described from a mountain region in the Atlantic Forest central corridor in state of Bahia, Brazil. the new species is characterized by elongate dorsal and lanceolate ventral scales arranged in diagonal rows, a single and smooth frontonasal, five supraoculars, absence of pollex, third toe as long as or longer than fourth, absence of striations in lower part of head, parietals longer than wide and as long as interparietal, 27-29 dorsals, 25-29 scales around body, 17-19 ventrals, 12-14 total pores in the male (absent in females), 9-10 and 9-11 subdigital lamellae respectively under IV Finger and IV Toe, and strong sexual color dichromatism with a black pigmentation in the ventral parts of males, creamy in females. the new species is morphologically similar to Leposoma nanodactylus, sharing with it among other features the synapomorphic division of the first supraocular. Phylogenetic analyses of 981 bp of combined sequences (cyt b+ ND4) recovered also a strongly supported (PP=1,0; BP=100) sister relationship between both species. the new species and Leposoma nanodactylus are placed sister to all the other Atlantic Forest species, with L. baturitensis being the first to diverge in this radiation. We discuss the distribution of the Atlantic Forest Leposoma, as well as possible scenarios for the origin of the new species.