A PERMIAN MIXOHALINE OSTRACOD ASSOCIATION OF THE TERESINA FORMATION, PARANA BASIN, BRAZIL

Abstract

New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresina Formation, Parana Basin, from two localities in the Sao Paulo State, southwestern Brazil: Xavante Dam and Pau Preto Quarry. Paranacythere nigripallus gen. nov. andsp. nov., Velatomorpha xavante sp. nov.,and Velatomorphapseudoaltilis 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.