| Popis: |
Sibynomorphus, an assemblage of about a dozen species of South American gastropod-eating colubrids, has a peculiar distribution. Six species occur in northern Peru and southwestern Ecuador. The others are distributed south of the Amazon basin in Brazil, Bolivia, Paraguay, Uruguay, and Argentina. Species of Sibynomorphus known from Ecuador and Peru are reviewed. Sibynomorphus oligozonatus and S. petersi are reported from Peru for the first time. Study of existing collections considerably amplifies understanding of the geographic ranges and character variation within S. oligozonatus, S. oneilli, S. petersi, and S. williamsi. Sibynomorphus vagrans is known only from its type locality (Bellavista, Cajamarca Department, Peru), and S. vagus (type locality unknown) is known only from near the single historically reported locality for the species (Huancabamba, Piura Department, Peru). Sibynomorphus oligozonatus (four specimens known) is distributed in southwestern Ecuador (Azuay and Loja Provinces) and n... |
