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American Zoologist 1989 29(3):857-862; doi:10.1093/icb/29.3.857
© 1989 by The Society for Integrative and Comparative Biology
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The Axial Tail Musculature of Recent Crocodiles and Its Phyletic Implications1

EBERHARD FREY, JURGEN RIESS and SAMUEL F. TARSITANO
Institut und Museum für Geologic und Paläontologie, The University of Tübingen D-7400 Tübingen 1, FRG
Department of Biology, Southwest Texas State University San Marcos, Texas 78666

The phylogenetic position of the Ganges Gharial (Gavalis gangeticus) among the living Crocodilia is reconsidered in the light of new biochemical and morphological data. The anatomical data suggest a sister group relationship between Gavialis and all other living crocodilians. In contrast the biochemical evidence indicates a sister group relationship between Gavialis and the false gavial, Tomistoma schlegelii, and the rest of the living Crocodilia. The new morphological data from the dissections of the caudal musculature clearly favor the phylogenetic relationship for Gavialis as proposed by the comparative anatomists. In this regard the findings of this study are concordant with those concerning the skull construction of the living crocodilians.


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