Ordovician cephalopods from Western Gondwana are still poorly known and published data is in need of systematic and stratigraphical revision. In this work, the endocerid proterocameroceratid Protocyptendoceras from the Floian of the Eastern Cordillera of Argentina is revised using new material from La Ciénaga, 5 km upstream from Purmamarca. The species P. corvalani and P. teicherti are considered to be junior synonyms of P. fuenzalidae, which is redescribed in detail and reillustrated. Specimens preserve adapical parts of isolated siphuncles, related here to the presence of endocones in a posterior portion. Evidently P. fuenzalidae had a nektobenthic mode of life in a shallow water environment, oriented horizontally. Its palaeobiogeographical affinities are mainly with Floian proterocameroceratids from Eastern Gondwana, such as Anthoceras decorum and the related genera Lobendoceras, Ventroloboceras, and Notocycloceras.
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1 March 2009
A Review of the Endocerid Cephalopod Protocyptendoceras from the Floian (Lower Ordovician) of the Eastern Cordillera, Argentina
Marcela Cichowolski
Acta Palaeontologica Polonica
Vol. 54 • No. 1
March 2009
Vol. 54 • No. 1
March 2009
Argentina
Cephalopoda
Eastern Cordillera
Endocerida
Floian
Ordovician
Proterocameroceratidae