Desmoceratidae, Silesitidae and Kossmaticeratidae (Ammonitida) from the Upper Aptian-Albian of Patagonia

MEDINA, F.A. & RICCARDI, A.C.

Revue de Paléobiologie

Muséum d'Histoire Naturelle

Lugar: Ginebra, Suiza; Año: 2005 p. 251 - 286

1661-5468

Upper Aptian-Albian Desmoceratidae, Silesitidae and Kossmaticeratidae of the Patagonian Andes are revised taxonomically and chronologically, based on the re-examination of all available specimens and of most Aptian-Albian localities of Santa Cruz Province, Argentina. Types and figured specimens of previously described species are reillustrated, but a few appear to be lost. Desmoceratidae Puzosiinae are represented by Pseudosilesites EGOIAN, Feruglioceras LEANZA, Umsinenoceras KENNEDY, WRIGHT and KLINGER, and Stolleyiceras gen. nov., Silesitidae by Neoastieria EGOIAN, Piatnitzkyceras gen. nov. and Bonarelliceras gen. nov., and Kossmaticeratidae by Eomarshallites MEDINA & RINALDI. They include Pseudosilesites russoi (LEANZA), Feruglioceras piatnitzkyi LEANZA, Umsinenoceras cardielense sp. nov., Stolleyiceras desmoceratoides (STOLLEY), Neoastieria patagonica sp. nov., Piatnitzkyceras bonarellii sp. nov., P.? infirmum sp. nov., Bonarelliceras meseticum (BONARELLI), Eomarshallites espinosum MEDINA & RINALDI and E. hibridum MEDINA & RINALDI. Sexual dimorphism is indicated or suggested for some species. Affinities with Upper Aptian–Albian Puzosiinae, Silesitidae and Kossmaticeratidae from other areas of the globe are discussed. Puzossiinae, Silesitidae and Kossmaticeratidae are present in several sections between San Martin and Cardiel lakes, where they characterize stratigraphic levels. The following occurrences are documented: Pseudosilesites russoi (LEANZA) in the Australiceras hallei and in the Peltocrioceras deeckei Assemblage Zones (Upper Aptian), Neoastieria patagonica sp. nov. in the Peltocrioceras deeckei Assemblage Zone, Feruglioceras piatnitzkyi LEANZA, Piatnitzkyceras bonarellii sp. nov. and P.? infirmum sp. nov. in the Aioloceras argentinum Assemblage Zone (Lower Albian), Umsinenoceras cardielense sp. nov. in the A. rollerii Assemblage Zone (Lower Albian), Stolleyiceras desmoceratoides (STOLLEY) belongs either to the A. argentinum or the A. rollerii Assemblage Zone, Bonarelliceras meseticum (BONARELLI) in the Sanmartinoceras patagonicum Assemblage Zone (Middle Albian), and Eomarshallites espinosum MEDINA & RINALDI and E. hibridum MEDINA & RINALDI in the Puzosia vegaensis Assemblage Zone (Upper Albian).