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The taxonomic status of Leptognathus incertus Jan, 1863, with revalidation of Dipsas alternans (Fischer, 1885) (Serpentes: Colubridae: Dipsadinae)

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The dipsadine snake Leptognathus incertus was originally described from French Guiana and subsequently was restricted to the Atlantic Rain Forest in southeastern and south Brazil. We compare its original description with available data for Leptognathus alternans as well as with species of the genus Dipsas occurring in French Guiana. Leptognathus alternans is revalidated in the combination Dipsas alternans, representing the populations occurring in the Atlantic Rain Forest of southeastern and south Brazil. The neotype of L. alternans is designated and described. The taxonomic status of L. incertus is revised and, in the interest of stabilizing the nomenclature of this species, Dipsas copei is synonymized with L. incertus in the combination Dipsas incerta, corresponding to populations of the Guianan region. The holotype of L. copei is designated as the neotype of L. incertus. A serpente dipsadínea Leptognathus incertus foi descrita originalmente da Guiana Francesa e posteriormente restrita à Floresta Atlântica no sudeste e sul do Brasil. Comparamos sua descrição original com os dados disponíveis de Leptognathus alternans, bem como com espécies do gênero Dipsas que ocorrem na Guiana Francesa. Leptognathus alternans é revalidada sob a combinação Dipsas alternans, representando as populações que ocorrem na Floresta Atlântica do sudeste e sul do Brasil. O neótipo de L. alternans é designado e descrito. O status taxonômico de L. incertus é revisado e, no interesse da estabilização da nomenclatura desta espécie, Dipsas copei é sinonimizada com L. incertus sob a combinação Dipsas incerta, correspondendo às populações da região das Guianas. O holótipo de L. copei é designado como o neótipo de L. incertus.


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