REASSESSMENT OF THE LIMNIC OSTRACODS FROM THE ITAPARICA FORMATION, BERRIANSIAN (LOWER CRETACEOUS), RECÔNCAVO BASIN, BAHIA, BRAZIL
A TAXONOMIC AND PALEOENVIRONMENTAL UPDATE
DOI:
https://doi.org/10.9771/geocad.v20i0.64563Palavras-chave:
Depositional Environment, Palaeoecology, Taxonomy.Resumo
Based on the study of a great quantity of ostracods carapaces from 10 cores of the Recôncavo Basin (Bahia, Brazil), this work presents the detailed and revised taxonomy of limnic ostracoda from the Itaparica Formation (Lower Cretaceous). Seven species belonging to four genera have been recovered: Kegelina kegeli, Kegelina depressa, Kegelina bisculpturata, Kegelina armata, Praecypridea acuta, Cypridea brevicornis, Theriosynoecum fittoni. What was once defined as Theriosynoecum varietuberatum proximum and Theriosynoecum varietuberatum varietuberatum is understood here as a difference in ornamental of the Theriosynoecum fittoni due to overall morphological compatibility. This observation is supported by most recent works, as it brings ornamentation itself as an insufficient aspect to distinct and define species for the Theriosynoecum genus. Based on the ostracoda associated with the litologic aspects, the Itaparica Fm represent a lacustrine depositional environment in a freshwater lake with depositions of shales, sandstones, siltstones, carbonatite and limestones in an arid climate.
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