A Permian mixohaline ostracod association of the Teresina Formation, Paraná Basin, Brazil
DOI:
https://doi.org/10.4072/rbp.2022.1.02Abstract
New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresina Formation, Paraná Basin, from two localities in the São Paulo State, southwestern Brazil: Xavante Dam and Pau Preto Quarry. Paranacythere nigripallus gen. nov. and sp. nov., Velatomorpha xavante sp. nov., and Velatomorpha pseudoaltilis sp. nov. are herein described. The association Velatomorpha–Paranacythere is proposed as typical of Permian mixohaline environments of the Teresina Formation, and is the most abundant in the two studied localities. Paranacythere nigripallus gen. nov. and sp. nov. is proposed to accommodate a very abundant species with typically cytheroidean characteristics, and tentatively ascribed to the family Cytheruridae. Some ecological remarks are presented based on ostracod population age structure, biostratinomy and taxonomic composition of assemblages. The diagnosis of Velatomorpha Tibert & Dewey is emended.
Keywords: evolution, marginal marine environments, paleoecology, Teresina Formation, taxonomy.
RESUMO – Novas espécies de ostracodes são propostas para rochas do Permiano Médio a Superior (Guadalupiano) da Formação Teresina, Bacia do Paraná, em duas localidades no Estado de São Paulo, sudeste do Brasil: Represa Xavante e
Pedreira Pau Preto. Paranacythere nigripallus gen. nov. e sp. nov., Velatomorpha xavante sp. nov., and Velatomorpha pseudoaltilis sp. nov. são descritas. A associação entre os gêneros Velatomorpha e Paranacythere é interpretada como típica de ambientes mixoalinos da Formação Teresina, e são os ostracodes mais abundantes nas localidades aqui estudadas. Paranacythere nigripallus gen. nov. e sp. nov. é proposto para acomodar uma espécie com características tipicamente cytheroides e tentativamente atribuído à família Cytheruridae. Aspectos ecológicos são discutidos com base na estrutura populacional etária, biostratinomia e composição taxonômica das assembleias. É proposta uma emenda à diagnose de Velatomorpha Tibert & Dewey.
Palavras-chave: ambientes marginais marinhos, evolução, Formação Teresina, paleoecologia, taxonomia.
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