Triassic conchostracans from Antofagasta, Atacama and Coquimbo Regions, Chile.

Abstract

Conchostracans from different triassic localities of Chile are describes and references to previous studies are made. The fauna comprises: Menucoestheria terneraensis gen. et sp. nov. from La Ternera Formation (Upper Triassic) and 'La Coipa Beds' (Lower Triassic); Menucoestheria puquenensis sp. nov. from the Pichidangui? and Profeta? Formations (Upper Triassic); Liograpta troncosoi sp. nov. from 'La Coipa Beds' (Lower Triassic) and Asmussia? sp. from Profeta? Formation (Upper Triassic). A few remarks on the geographical distribution, biochrons and taxonomic implicances of the describes taxons are made.