. Breviora. BREVIORA No. 464. Figure 4. The right astragalus and calcaneum of Trilophosaurus. Calcaneum in A) ventral, B) dorsal, C) proximal, and D) distal views; astragalus in E) ventral, F), medial, and G) dorsal views. Calcaneum: specimen TMM 31025-258; astragalus: specimen TMM 31025-259, Texas Memorial Museum. appears. Prolacerta and Protorosaurus have long been recognized as being closely related (Camp, 1945; Watson, 1958). Romer (1956) denied the presence of such a relationship, choosing to place Protorosaurus in the Euryapsida because of the presumed presence of a solid cheek. However,
. Breviora. BREVIORA No. 464. Figure 4. The right astragalus and calcaneum of Trilophosaurus. Calcaneum in A) ventral, B) dorsal, C) proximal, and D) distal views; astragalus in E) ventral, F), medial, and G) dorsal views. Calcaneum: specimen TMM 31025-258; astragalus: specimen TMM 31025-259, Texas Memorial Museum. appears. Prolacerta and Protorosaurus have long been recognized as being closely related (Camp, 1945; Watson, 1958). Romer (1956) denied the presence of such a relationship, choosing to place Protorosaurus in the Euryapsida because of the presumed presence of a solid cheek. However, as noted by Chatterjee (1980), much uncertainty about the structure of the skull of Protorosaurus exists. Details of the skull and postcranial skeleton that are known for certain are similar to Prolacerta, and Chatterjee unites these genera in the suborder Prolacertiformes. Gow (1975) concluded on the basis of evidence from the skull of Prolacerta that the Prolacerti- formes are related to archosaurs. The remaining groups in this assemblage, rhynchosaurids and trilophosaurids, have highly specialized skulls that could be derived from any primitive diapsid, so the skull neither supports nor negates a relationship between these groups and the archosaur-protoro-. 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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