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Ophthalmosaurian (Ichthyosauria) records from the Aalenian-Bajocian of Patagonia (Argentina); an overview

Marta S. Fernandez and Marianella Talevi
Ophthalmosaurian (Ichthyosauria) records from the Aalenian-Bajocian of Patagonia (Argentina); an overview (in New perspectives on ancient marine reptiles, Benjamin P. Kear (editor) and Graham E. Budd (editor))
Geological Magazine (January 2014) 151 (1): 49-59


The oldest ophthalmosaurian records worldwide have been recovered from the Aalenian-Bajocian boundary of the Neuquen Basin in Central-West Argentina (Mendoza and Neuquen provinces). Although scarce, they document a poorly known period in the evolutionary history of parvipelvian ichthyosaurs. In this contribution we present updated information on these fossils, including a phylogenetic analysis, and a redescription of "Stenopterygius grandis" Cabrera, 1939. Patagonian ichthyosaur occurrences indicate that during the Bajocian the Neuquen Basin palaeogulf, on the southern margins of the Palaeopacific Ocean, was inhabited by at least three morphologically discrete taxa: the slender Stenopterygius cayi, robust ophthalmosaurian Mollesaurus periallus and another indeterminate ichthyosaurian. Rib bone tissue structure indicates that rib cages of Bajocian ichthyosaurs included forms with dense rib microstructure (Mollesaurus) and forms with an "osteoporotic-like" pattern (Stenopterygius cayi).

ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 151
Serial Issue: 1
Title: Ophthalmosaurian (Ichthyosauria) records from the Aalenian-Bajocian of Patagonia (Argentina); an overview
Title: New perspectives on ancient marine reptiles
Author(s): Fernandez, Marta S.Talevi, Marianella
Author(s): Kear, Benjamin P.editor
Author(s): Budd, Graham E.editor
Affiliation: Museo de La Plata, Division Palaeontologia Vertebrados, La Plata, Argentina
Affiliation: Uppsala University, Department of Earth Sciences, Uppsala, Sweden
Pages: 49-59
Published: 201401
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 41
Accession Number: 2014-027301
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S55°00'00" - S37°00'00", W73°30'00" - W62°10'00"
Secondary Affiliation: Universidad Nacional de Rio Negro, ARG, Argentina
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201417
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