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Cytogenetic analysis of the pleurodine turtle Phrynops hogei and its taxonomic implications

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Conventional chromosomal preparations of the Brazilian sidenecked turtle Phrynops hogei indicate the karyotype of this species (diploid number 2n = 58; fundamental number FN = 64) is identical to that reported for other members of the genus. Electron microscopic analysis of whole-cell complements of synaptonemal complexes corroborated the karyotypic description and provided definitive resolution of the acrocentric condition of the microchromosomes. Additionally, this approach provided a continuous sequence of prophase I nuclei which enabled detailed description of chromosomal behavior from leptonema through diakinesis and the sequence of centriolar replication.

Affiliations: 1: Department of Biology, Texas A&M University, College Station, TX 77843-3258, USA; 2: Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-3258, USA; 3: Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, Orthopaedic Asso-ciates, P.C., Nichols Road, Fitchburg, MD, 01420, USA; 4: Conservation International, 1015 18th Street NW, Washington, DC, 20036, USA; 5: Fundação Rio Zoo, Quinta da Boa Vista, São Cristóvão — Rio de Janeiro, Brasil


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