Early Jurassic Caenogastropoda and Architectibranchia from the Neuquén Basin, Argentina

FERRARI, S.M

JOURNAL OF PALEONTOLOGY

PALEONTOLOGICAL SOC INC

Lugar: Lawrence; Año: 2017

0022-3360

Early Jurassic marine gastropods are well represented in Argentina by threemajor taxa: Vetigastropoda, Caenogastropoda and Architectibranchia (=Opisthobranchia).The present paper aims at the description of six new caenogastropod species andone new architectibranch species from the Early Jurassic marine deposits of theNeuquén Basin, namely Procerithium subimbricatum n. sp., Microschiza weaverin. sp., Naricopsina aequabilis n. sp.,Naricopsina ballentae n. sp., Pictavia rothi n. sp., Oonia acuta n. sp. and  Cylindrobullinabrevispira n. sp. Seven other caenogastropods are reported for the firsttime in the area, including Cryptaulax redeliiFerrari, Procerithium nulloi (Ferrari), Rhabdocolpuspatagoniensis (Ferrari), Rhabdocolpus? sp., Pseudomelaniaferuglioi Ferrari, Pseudomelania aff.baugieriana (d?Orbigny) and Anulifera chubutensis Ferrari, extending their palaeobiogeographical distribution to the Andean regionof Argentina during the Early Jurassic. Caenogastropods such as, Globularia catanlilensis (Weaver) and Microschiza?americana (Möricke), and thearchitectibranch species Striactaeoninatransatlantica (Behrendsen) and Cylindrobullinaovata (Behrendsen) are redescribed and discussed on the basis of  new specimens from the type and other localities.The new fossils described here expand the known diversity of the gastropodfaunas in the Early Jurassic of Argentina and contribute to the paleontologicalknowledge of the group in the Mesozoic of South America.