. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Acheloma Trematops Fig. 30. Trematopsids. Mainly after Trematops to the usual shortness of the face in dissorophids; but between Trema- tops and the relatively long-faced Aspidosaurus the contrast is much less marked. In the postcranial skeleton the similarities are numerous and striking. Much of the resemblance between the families may be laid to parallelism, as Olson suggests; but resemblances are so numer- ous that it is not improbable that there is a real relationship, and that the parallelism is true para
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Acheloma Trematops Fig. 30. Trematopsids. Mainly after Trematops to the usual shortness of the face in dissorophids; but between Trema- tops and the relatively long-faced Aspidosaurus the contrast is much less marked. In the postcranial skeleton the similarities are numerous and striking. Much of the resemblance between the families may be laid to parallelism, as Olson suggests; but resemblances are so numer- ous that it is not improbable that there is a real relationship, and that the parallelism is true parallelism, in the narrow sense of the term, between closely related evolutionary phyla. Acheloma (Fig. 30) Long obscure, the nature of this Texas Lower Permian genus (cf. Case 1911, pp. 34-37, 104-lOG, pi. 11) has been revealed by recently discovered material (Olson 1941); it proves to be a genus close to Trematops but rather more primitive in nature. The geno- type, A. cumminsi, is recorded as occurring in the Clear Fork, but this may be inaccurate, and two new species erected by Olson {A. pricei, A. whitei) are from the Wichita beds (Putnam and Belle Plains Formations, respectively). These forms differ from Trematops, among. 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. : The Museum
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