CASADIO Silvio Alberto
Upper Maastrichtian and Danian bryozoans from Northern Patagonia, Argentina
BREZINA, SOLEDAD S.; TAYLOR, PAUL D.; ROMERO, MARÍA V.; PALÓPOLO, EVANGELINA E.; CASADÍO, SILVIO
CRETACEOUS RESEARCH (PRINT)
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Año: 2021 vol. 125 p. 1 - 33
The specimen-rich and diverse bryozoan fauna encrusting oyster shells from the Maastrichtian andDanian Jagüel and Roca formations in the Neuquen Basin (Patagonia, Argentina) is described. Thirteencyclostome species are recorded, along with 18 cheilostomes. We introduce two new species: Akatoporakaufmanni sp. nov. and Eoporella lunata gen. et sp. nov. The latter is a homeomorph of the commonMioceneeRecent genus Microporella. Ten of the cyclostomes and ten of the cheilostomes could not beidentified at species-level because of preservational limitations or lack of diagnostic characters in theavailable specimens. The most common bryozoans present are sheet-like colonies, among which theascophoran cheilostome Balantiostoma is particularly well represented. Results show that in northernPatagonia the diversity of encrusting bryozoans associated with oyster shells exhibits no major changesacross the K/Pg boundary. However, an important increase in the diversity is recorded during the upperDanian.