A new discinoid Kosoidea australis sp. nov. from the Iapo and Vila Maria Formations, NE Parana Basin, Brazil

Autor(es)

Zabini, Carolina ^[1] ; Furtado-Carvalho, Ana Beatriz ^[2] ; Carmo, Dermeval Do ^[3] ; Assine, Mario Luis ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Geosci, Dept Geol & Nat Resources, BR-13083855 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Inst Geosci, Lab Paleohydrogeol, Campinas, SP - Brazil

^[3] Univ Brasilia, Inst Geosci, Lab Micropaleontol, Campus Darcy Ribeiro, Brasilia, DF - Brazil

^[4] Sao Paulo State Univ UNESP IGCE, Appl Geol Dept, Rio Claro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HISTORICAL BIOLOGY; v. 33, n. 4 AUG 2019.
• Citações Web of Science: 0

Resumo

Many fossil brachiopod genera are used to comprehend previous geological settings. Such fossils often provide trustworthy information about ancient earth configurations, such as the supercontinent Gondwana. This study presents a new occurrence of a discinoid brachiopod, from the Iapo and Vila Maria Formations of the Parana Basin. Fossiliferous strata overlie deposits of glacial and post-glacial times, here interpreted as Hirnantian in age. This is the first occurrence of Kosoidea for Paleozoic strata of Brazilian Sedimentary Basins. A new discinoid species Kosoidea australis sp. nov. is erected. Disarticulated valves are extremely abundant as juveniles in transgressive marine mudrocks. The new species is characterised by a convexo-plane shell and a marked posterior triangular pedicle opening. The microornamentation consists of pits arranged in radial rays, mostly visible on the dorsal valve surface. Adults are rare, and a size-sorting process probably sieved and fragmented the valves during transportation and fossilisation. Medium to large discinoids - such as the one here described - are commonly associated with chilly waters. The presence of this genus both in Soom Shale (Cape Basin, South Africa) and in Parana Basin, associated to sedimentological data points to a possible connection between the two in marginal basins of Gondwana, during the Early Paleozoic. (AU)

• Processo FAPESP: 17/10956-5 - Taxonomia e análise fossildiagenética dos lingulídeos paleozoicos das Bacias do Paraná e Parnaíba
• Beneficiário: Carolina Zabini
• Modalidade de apoio: Auxílio à Pesquisa - Regular