Upper Maastrichtian and Danian bryozoans from Northern Patagonia, Argentina

摘要: ABSTRACT The specimen-rich and diverse bryozoan fauna encrusting oyster shells from the Maastrichtian Danian Jaguel Roca formations in Neuquen Basin (Patagonia, Argentina) is described. Thirteen cyclostome species are recorded, along with 18 cheilostomes. We introduce two new species: Akatopora kaufmanni sp. nov. Eoporella lunata gen. et latter a homeomorph of common Miocene–Recent genus Microporella. Ten cyclostomes ten cheilostomes could not be identified at species-level because preservational limitations or lack diagnostic characters available specimens. most bryozoans present sheet-like colonies, among which ascophoran cheilostome Balantiostoma particularly well represented. Results show that northern Patagonia diversity associated exhibits no major changes across K/Pg boundary. However, an important increase recorded during upper Danian.