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      Karyotypes of two rare rodents, Hapalomys delacouri and Typhlomys cinereus (Mammalia, Rodentia), from Vietnam

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          Abstract

          Abstract

          Karyotypes of Hapalomys delacouri ( Rodentia, Muridae) and Typhlomys cinereus ( Rodentia, Platacanthomyidae) from Vietnam are described for the first time. The diploid karyotype of Hapalomys delacouri is 38 (NFa=48), consisting of six pairs of bi-armed and 12 pairs of acrocentric autosomes decreasing in size; plus a large metacentric X chromosome and Y chromosome, also metacentric, that is equal in size to the largest pair of acrocentric autosomes. The newly described karyotype differs significantly from that reported for Hapalomys delacouri from northern Thailand. The latter record very likely represents a different species of Hapalomys , possibly the taxon Hapalomys pasquieri described from north-central Laos.The diploid karyotype of Typhlomys cinereus is 38 (NF=48), consisting of five pairs of meta- to submetacentric and 14 pairs of acrocentric chromosomes varying in size from large to small; sex chromosomes were not defined.

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          A colchicine, hypotonic citrate, squash sequence for mammalian chromosomes.

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            The Phylogenetic Position of the Rodent GenusTyphlomysand the Geographic Origin of Muroidea

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              Mitochondrial diversity of the white-toothed shrews (Mammalia, Eulipotyphla, Crocidura) in Vietnam

              We explored the patterning of genetic diversity within white-toothed shrews of the genus Crocidura from 14 localities across Vietnam. An analysis of cytochrome oxidase c subunit I (COI) and cytochrome b (cytb) gene fragments from 185 specimens of white-toothed shrews of the genus Crocidura from 14 localities across Vietnam revealed six deeply divergent (p-distance for both COI and cytb >10%) lineages, corresponding to the morphological species C. sokolovi, C. zaitsevi, C. phuquocensis, С . indochinensis, C. tanakae and, C. phanluongi. Crocidura sokolovi was distinct from all other Vietnamese white-toothed shrews (~13% on average for both cytb and COI). In addition to demonstrating the genetic separation of previously described species, substantial cryptic genetic diversity was revealed. Crocidura zaitsevi and C. tanakae each included two subgroups that corresponded to geographically remote localities, while C. indochinensis contained two distinct subgroups that exhibited co-varying patterns of morphological and ecological differentiation, suggesting that the individuals from Sa Pa represent a separate species (provisionally named Crocidura sp. AB1). Mitochondrial data generated for the type specimens of C. phanluongi from Yok Don and Bu Gia Map supported the validity of the species while an additional specimen from Binh Chau, South Vietnam originally referred to C. phanluongi exhibited a deep genetic split (cytb: 8.4%; COI: 8.7%) from a neighbouring population in Yok Don. We propose that the specimen from Binh Chau also represents an undescribed species (provisionally named Crocidura sp. AB2). Our cytb data were then compared to the sequences of 28 species of Crocidura from Southeast Asia available in GenBank, suggesting that three more species occur in northern Vietnam, namely C. wuchihensis, C. attenuata and C. fuliginosa/C. dracula. The discovery of fairly deep genetic divergences among Vietnamese Crocidura illustrates that the understudied and largely undescribed diversity of white-toothed shrews in Southeast Asia requires deeper scrutiny. It also shows the useful insights of mitochondrial markers as to the taxonomic resolution of this enigmatic group of mammals.
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                Author and article information

                Journal
                Zookeys
                ZooKeys
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2012
                11 January 2012
                : 164
                : 41-49
                Affiliations
                [1 ]Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, Saint-Petersburg 199034, Russia
                [2 ]A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr., 33, Moscow 119071, Russia
                [3 ]Joint Vietnam-Russian Tropical Research and Technological Centre, Nguyen Van Huyen, Nghia Do, Cau Giay, Hanoi, Vietnam
                Author notes
                Corresponding author: Alexei V. Abramov ( a.abramov@ 123456mail.ru )

                Academic editor: K. M. Helgen

                Article
                10.3897/zookeys.164.1785
                3272621
                22328851
                c4441624-12be-46cd-802d-6089801922c5
                Alexei V. Abramov, Vladimir M. Aniskin, Viatcheslav V. Rozhnov

                This is an open access article distributed under the terms of the Creative Commons Attribution License 3.0 (CC-BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 8 July 2011
                : 21 December 2011
                Categories
                Article

                Animal science & Zoology
                hapalomys pasquieri,karyotypes,vietnam,hapalomys delacouri,typhlomys cinereus

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