Rhachidelus

Rhachidelus is a genus of snake in the subfamily Dipsadinae. The genus is endemic to South America.
Species.
The genus "Rhachidelus" is monotypic, containing the sole species Rhachidelus brazili, which is commonly known as the Brazilian bird snake.
Etymology.
The specific name, "brazili", is in honor of Brazilian herpetologist Vital Brazil.
Geographic range.
"R. brazili" is found in northeastern Argentina, southern Brazil, and southeastern Paraguay.