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1 June 2004 REDESCRIPTION AND PHYLOGENETIC POSITION OF THE ADRIATIC (UPPER CRETACEOUS; CENOMANIAN) DOLICHOSAUR PONTOSAURUS LESINENSIS (KORNHUBER, 1873)
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Abstract

The Upper Cretaceous marine squamate Pontosaurus lesinensis is redescribed. Extensive re-preparation has exposed new details of the skull, mandibles, and postcranial skeleton. Important new characteristics include a unique supraoccipital-parietal articulation, elongation of all postdentary bones, at least twelve cervical vertebrae, hypapophyses with large unfused peduncles, twenty-eight dorsal vertebrae, and a fused scapulocoracoid with a primary coracoid emargination. Cladistic analysis of all anguimorph squamates, including mosasaurs, aigialosaurs, dolichosaurs, snakes, and Pontosaurus, resulted in 3-most parsimonious trees: 334 steps; C.I. 0.78; H.I. 0.42; R.I. 0.81. Both the strict consensus tree and the 50% majority-rule consensus tree found support for the monophyly of the Pythonomorpha, containing mosasaurs, aigialosaurs, dolichosaurs, and snakes (pachyophiids and modern snakes). Pontosaurus is found to be a dolichosaur nested within the clade Pythonomorpha as the sister taxon to Adriosaurus and the Ophidia.

STEPHANIE E. PIERCE and MICHAEL W. CALDWELL "REDESCRIPTION AND PHYLOGENETIC POSITION OF THE ADRIATIC (UPPER CRETACEOUS; CENOMANIAN) DOLICHOSAUR PONTOSAURUS LESINENSIS (KORNHUBER, 1873)," Journal of Vertebrate Paleontology 24(2), 373-386, (1 June 2004). https://doi.org/10.1671/1960
Received: 7 October 2002; Accepted: 1 June 2003; Published: 1 June 2004
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