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Journal of Paleontology

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NEW MORPHOLOGICAL DATA FOR EOSANIWA KOEHNI HAUBOLD, 1977 AND A REVISED PHYLOGENETIC ANALYSIS

¹ Department of Geology, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605, rieppel{at}fieldmuseum.org,
² Department of Paleontology, American Museum of Natural History, 79^th Street at Central Park West, New York, New York 10024, jlconrad{at}amnh.org,
³ Jackson School of Geosciences, The University of Texas, Austin, Texas 78712, maisano{at}mail.utexas.edu

Eosaniwa koehni is an enigmatic platynotan that differs from related varanoids in the possession of a very long snout resulting in extremely elongate nasals and vomers; a robust and broad jugal; the presence of denticles on palatines, pterygoids, and vomers; the presence of a subdental shelf on the dentary; and a strongly twisted retroarticular process on the mandible. Phylogenetic analysis suggests that Eosaniwa is a derived varanoid platynotan, nested within a clade also including mosasauroids, Coniasaurus, and Paravaranus.