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We present a molecular phylogeny of snake genus    Atractus   , with an improved taxon sampling that includes 30 of the 140 species currently recognized. The phylogenetic tree supports the existence of at least three new species in the Pacific lowlands and adjacent Andean slopes of the Ecuadorian Andes, which we describe here. A unique combination of molecular, meristic and color pattern characters support the validity of the new species. With the newly acquired data, we propose and define the    A.   iridescens    species group, as well as redefine the    A.   roulei    species group. The species    A.   iridescens    is reported for the first time in Ecuador, whereas    A.   bocourti    and    A.   medusa    are removed from the herpetofauna of this country. We provide the first photographic vouchers of live specimens for    A.   multicinctus   ,    A.   paucidens    and    A.   touzeti   , along with photographs of 19 other Ecuadorian    Atractus    species. The current status of    A.   occidentalis    and    A.   paucidens    is maintained based on the discovery of new material referable to these species. With these changes, the species number reported in Ecuador increases to 27, a number that is likely to increase as material not examined in this work becomes available and included in systematic studies.

Molecular phylogeny of Atractus ( Serpentes , Dipsadidae ), with emphasis on Ecuadorian species and the description of three new taxa