. Breviora. 1981 THE ORIGIN OF THE CROCODIl OID TARSI 21 SUMMARY A summary of the relationships suggested above may be made in the form of a phylogenetic diagram (Fig. 13). According to this phylogeny. many of the higher taxa of diapsid reptiles are artificial assemblages, and major modifications of reptilian classification are necessary to accurately reflect reptilian relationships. It would, however, be useful to test these relationships through examination of other structural complexes before making the necessary changes. Ornithosuchidae Stagonolepdidae Rauisuchidae Gracilisuchus Lacertilia
. Breviora. 1981 THE ORIGIN OF THE CROCODIl OID TARSI 21 SUMMARY A summary of the relationships suggested above may be made in the form of a phylogenetic diagram (Fig. 13). According to this phylogeny. many of the higher taxa of diapsid reptiles are artificial assemblages, and major modifications of reptilian classification are necessary to accurately reflect reptilian relationships. It would, however, be useful to test these relationships through examination of other structural complexes before making the necessary changes. Ornithosuchidae Stagonolepdidae Rauisuchidae Gracilisuchus Lacertilia. Tnlophosaundae Sauropterygia Figure 13. The interrelationships of thecodonts. ACKNOWLEDGMENTS I would like to thank Dr. R. L. Carroll, at whose suggestion this project was undertaken. For reading the manuscript and making many useful suggestions, 1 thank Hans Dieter Sues, Museum of Comparative Zoology, Harvard University; Michael Parrish, Uni- versity of Chicago; Dr. Sankar Chatterjee, Texas Tech University; and Robert Long and Dr. S. Welles, University of California,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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