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1 June 2005 AN UNUSUAL TYLOSAURINE MOSASAUR FROM NEW ZEALAND: A NEW SKULL OF TANIWHASAURUS OWENI (LOWER HAUMURIAN; UPPER CRETACEOUS)
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Abstract

Recently collected materials of a tylosaurine mosasaur from Haumuri Bluff, New Zealand, are assigned to Taniwhasaurus oweni Hector, 1874. Previously described tylosaurine mosasaur specimens from Haumuri Bluff that were assigned to other taxa are re-evaluated here and assigned to T. oweni. Taniwhasaurus is diagnosed as a tylosaurine based on the possession of a premaxillary rostrum and anterior edentulous process of the dentary. However, Taniwhasaurus also exhibits a prefrontal-maxillary contact in which the prefrontal forms a portion of the naris, thus precluding the frontal-maxillary contact characteristic of all other tylosaurines with the possible exception of Hainosaurus bernardi. The distribution of the frontal-maxillary contact in mosasaurs suggests that it may be correlated with snout elongation.

MICHAEL W. CALDWELL, ROBERT HOLMES, GORDEN L. BELL, and JOAN WIFFEN "AN UNUSUAL TYLOSAURINE MOSASAUR FROM NEW ZEALAND: A NEW SKULL OF TANIWHASAURUS OWENI (LOWER HAUMURIAN; UPPER CRETACEOUS)," Journal of Vertebrate Paleontology 25(2), (1 June 2005). https://doi.org/10.1671/0272-4634(2005)025[0393:AUTMFN]2.0.CO;2
Received: 6 July 2004; Accepted: 9 August 2004; Published: 1 June 2005
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