. Breviora. 22 BREVIORA No. 474. Figure 15. R. elcobriensis, MCZ 3150. A. Dorsal view of right astragalus, calca- neum complex. B. Ventral view of the same. C. Dorsal view of right pes. D. Ventral view of the same. Scale equals 1 cm. Abbreviation: c, centrale. DISCUSSION Ruthiromia elcobriensis is considered a pelycosaur on the basis of the combined, derived characters (within reptiles) of excavated neu- ral arches, keeled mid-dorsal vertebrae, a strongly developed pro- cess for the coracoid head of the triceps and a keeled angular in the region of the articular. These constitute a suite of ch


. Breviora. 22 BREVIORA No. 474. Figure 15. R. elcobriensis, MCZ 3150. A. Dorsal view of right astragalus, calca- neum complex. B. Ventral view of the same. C. Dorsal view of right pes. D. Ventral view of the same. Scale equals 1 cm. Abbreviation: c, centrale. DISCUSSION Ruthiromia elcobriensis is considered a pelycosaur on the basis of the combined, derived characters (within reptiles) of excavated neu- ral arches, keeled mid-dorsal vertebrae, a strongly developed pro- cess for the coracoid head of the triceps and a keeled angular in the region of the articular. These constitute a suite of characters which is found only within the pelycosaurian families Varanopseidae and Sphenacodontidae. The Varanopseidae is currently defined by cranial characters (Langston and Reisz, 1981), yet shows a unique combination of two derived, postcranial characters: excavated neural arches and the. 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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