Taxonomy of limnic Ostracoda (Crustacea) from the Quiricó Formation, Lower Cretaceous, São Francisco basin, Minas Gerais State, Southeast Brazil

Abstract

AbstractThe present work presents a detailed taxonomic study on Ostracoda from the Quiricó Formation, Areado Group, São Francisco Basin, Brazil. The samples were collected from three outcrops in the Minas Gerais State: Tereza Farm (João Pinheiro Municipality), and from the banks of the São José and Quiricó creeks (Presidente Olegário Municipality). Sixteen ostracode species were recovered:Harbinia alta,Harbiniaaff.H.angulata,Harbiniaaff. H.crepata,Harbiniaaff.H.salitrensis,Harbinia symmetrica,Brasacypris fulfaroi,Brasacypris ovum,Cypridea conjugata,Cypridea hystrix,Cypridea infima,Cypridea jequiensis,Neuquenocypris(Protoneuquenocypris)antiqua,Penthesilenula martinsi,Penthesilenula pintoinew species,Alicenula longiformisnew species, andTimiriasevia sanfranciscanensisnew species. With the recovery of well-preserved specimens, it was possible to observe new characteristics inBrasacypris ovum,Cypridea conjugata,C.hystrix, andC.infima, and propose emendments to them. Additionally, three new species are described:Penthesilenula pintoin. sp.,Alicenula longiformis, n. sp., andTimiriasevia sanfranciscanensisn. sp. To date, the genusTimiriaseviahad not been recorded in strata from Brazil. Also,Darwinula martinsiis reassigned to the genusPenthesilenula. Several species herein recorded are also found in other Brazilian continental basins, as well as in African and Argentinian basins, contributing to the knowledge of Brazilian Cretaceous continental deposits.