963 resultados para Hutchinson, Thomas--1711-1780
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Mode of access: Internet.
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Goldsmiths'-Kress no. 27139.
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Rees, E. Libri Walliae,
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Vol. 3 printed by Manning & Loring for Thomas & Andrews.
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Includes index: p. [585]-598.
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Mode of access: Internet.
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The present volume is an abstract of the Memoirs by Dr. Hanna. Cf.Pref.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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WHS shelf-list has note: Inv. 1275.
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Mode of access: Internet.
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Scale not given.
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A novel karyotype with 2n = 50, FN = 48, was described for specimens of Thaptomys collected at Una, State of Bahia, Brazil, which are morphologically indistinguishable from Thaptomys nigrita, 2n = 52, FN = 52, found in other localities. It was hence proposed that the 2n = 50 karyotype could belong to a distinct species, cryptic of Thaptomys nigrita, once chromosomal rearrangements observed, along with the geographic distance, might represent a reproductive barrier between both forms. Phylogenetic analyses using maximum parsimony and maximum likelihood based on partial cytochrome b sequences with 1077 bp were performed, attempting to establish the relationships among the individuals with distinct karyotypes along the geographic distribution of the genus; the sample comprised 18 karyotyped specimens of Thaptomys, encompassing 15 haplotypes, from eight different localities of the Atlantic Rainforest. The intra-generic relationships corroborated the distinct diploid numbers, once both phylogenetic reconstructions recovered two monophyletic lineages, a northeastern clade grouping the 2n = 50 and a southeastern clade with three subclades, grouping the 2n = 52 karyotype. The sequence divergence observed between their individuals ranged from 1.9% to 3.5%.
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American Museum of Natural History