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1 September 2011 A New Barremian (Early Cretaceous) Ichthyosaur from Western Russia
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Abstract

A new ophthalmosaurid ichthyosaur, Sveltonectes insolitus, gen. et sp. nov., is described from a sub-complete and three-dimensionally preserved specimen from the late Barremian of western Russia. This new taxon is supported by 11 cranial, dental, and postcranial autapomorphies, and is also characterized by features previously considered as autapomorphic for some other Ophthalmosauridae, such as a processus narialis on the prefrontal and relatively long hind fins with pre- and postaxial accessory digits. We conducted a new phylogenetic analysis of Thunnosauria, which supports a ‘Stenopterygius’ origin for Ophthalmosauridae. Sveltonectes is regarded as the sister taxon of Aegirosaurus, which shares a similar skull roof construction. Contrary to most other Cretaceous ichthyosaurs, Sveltonectes is characterized by delicate and sharply pointed teeth, confirming that the ophthalmosaurids were ecologically highly diversified during the Early Cretaceous.

© 2011 by the Society of Vertebrate Paleontology
Valentin Fischer, Edwige Masure, Maxim S. Arkhangelsky, and Pascal Godefroit "A New Barremian (Early Cretaceous) Ichthyosaur from Western Russia," Journal of Vertebrate Paleontology 31(5), 1010-1025, (1 September 2011). https://doi.org/10.1080/02724634.2011.595464
Received: 18 December 2010; Accepted: 2 June 2011; Published: 1 September 2011
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