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Re: Buccal soft anatomy in Lesothosaurus

And two more papers on mesozoic reptiles in the same issue:

Maisch, Michael W.; Jiang, Da-Yong; Hao, Wei-Cheng; Sun, Yuan-Lin; Sun, Zuo-Yu; Stöhr, Henrik. 2008. A well-preserved skull of Qianichthyosaurus zhoui LI, 1999 (Reptilia: Ichthyosauria) from the Upper Triassic of China and the phylogenetic position of the Toretocnemidae. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, Volume 248, Number 3, June 2008 , pp. 257-266.

A well-preserved skull and mandible of the toretocnemid ichthyosaur Qianichthyosaurus zhoui LI, 1999 is described from the Upper Triassic Wayao Member of the Falang Formation (Carnian) of Guanling County, Guizhou Province, southwestern China. It allows substantial additions to the knowledge of the cranial osteology of this taxon and the rectification of previous misinterpretations, particularly of the temporal region. Qianichthyosaurus shows numerous similarities to the mixosaurids in its cranial skeleton, particularly with regard to the temporal region, skull proportions and dentition, although it lacks some key features of the family, such as continuous supranarial and supraorbital crests or a high saggital crest on nasal, frontal and parietal. Nevertheless, there is some evidence that the jaw muscles were arranged similarly to the mixosaurids. The similarities in cranial osteology, together with some remarkably plesiomorphic features of the postcranial skeleton, suggest, that the Toretocnemide may not be the sister-group of the Longipinnati, as previously proposed, but may be closely related to the Mixosauridae instead, developing the basically tridactylous fin pattern independently of other longipinnate ichthyosaurs.


?si, Attila. 2008. Cranial osteology of Iharkutosuchus makadii, a Late Cretaceous basal eusuchian crocodyliform from Hungary. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, Volume 248, Number 3, June 2008 , pp. 279-299.

The detailed cranial osteology of Iharkutosuchus makadii is described herein. Comparisons with advanced neosuchians and basal eusuchians confirm that Iharkutosuchus is a basal eusuchian, which shares several features with the Barremian Hylaeochampsa vectiana. On the basis of in situ and isolated teeth, the complete, heterodont dentition of Iharkutosuchus is reconstructed. The dentition is composed of incisiviform, premolariform and molariform teeth with an increase in the number of cusps on the crowns posteriorly. Iharkutosuchus has robust and wide ectopterygoids and extremely large and wide posterior teeth also supposed in Hylaeochampsa. Additional special characters include the closed supratemporal fenestrae and the long, posteriorly extended process of the maxilla. These features are related to the food processing of this small-bodied animal. Iharkutosuchus confirms the hypothesis that the advanced caudal migration of the secondary palate is a consequence of the structural reinforcement of the skull.


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