The Miocene beds of Western Nebraska and Eastern Wyoming and their vertebrate faunae

Abstract

Examination of most of the specimens,including holotypes,of cabassous that are extant in the major collections indicates the following taxa and distributions: C. centralis(Miller), Central and South America to northwestern Venezuela; C. unicinctus unicinetus (L.),east of the Andes and north of the Amazon; C. u. squamicaudis( Lund),intergrading with C. u. unicinctus along the Amazon-Solimões and thence south to the Mato Grosso;C . chacoensis, a new species of the Gran Chaco; C. tatouay( Desmarest),from the southeastern highlands of Brazil to Uruguay and northeastern Argentina;and a larger