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A molecular phylogeny of the Neotropical snail-eating snakes (tribe   Dipsadini  ) is presented including 43 (24 for the first time) of the 77 species, sampled for both nuclear and mitochondrial genes. Morphological and phylogenetic support was found for four new species of    Dipsas    and one of    Sibon   , which are described here based on their unique combination of molecular, meristic, and color pattern characteristics.    Sibynomorphus    is designated as a junior subjective synonym of    Dipsas   .    Dipsas   latifrontalis    and    D.   palmeri    are resurrected from the synonymy of    D.   peruana   .    Dipsas   latifasciata    is transferred from the synonymy of    D.   peruana    to the synonymy of    D.   palmeri   . A new name,    D.   jamespetersi   , is erected for the taxon currently known as    Sibynomorphus   petersi   . Re-descriptions of    D.   latifrontalis    and    D.   peruana    are presented, as well as the first photographic voucher of an adult specimen of    D.   latifrontalis   , along with photographs of all known Ecuadorian   Dipsadini   species. The first country record of    D.   variegata    in Ecuador is provided and    D.   oligozonata    removed from the list of Peruvian herpetofauna. With these changes, the number of   Dipsadini   reported in Ecuador increases to 22, 18 species of    Dipsas    and four of    Sibon   .

Systematics of South American snail-eating snakes ( Serpentes , Dipsadini ), with the description of five new species from Ecuador and Peru