. Breviora. 8 BREVIORA No. 360 Order Notoungulata Roth Family Isotemnidae Ameghino Coelostylodon, new genus Etymology. Greek koilos, hollow, stylos, pillar, odon, tooth. The name is meant to recall former reference to Acoelodiis and resemblance to Pleurostylodon. It is also consonant with much Ameghinian nomenclature. Type-species. Coelostylodon florentinoameghinoi, new species, injra. Known distribution. Casamayoran, Argentine Patagonia. Diagnosis. Primitive notoungulates with complete, nearly closed dentition. Upper canine small and fully incisiform. Cheek teeth brachydont, P--M^ soon wearin
. Breviora. 8 BREVIORA No. 360 Order Notoungulata Roth Family Isotemnidae Ameghino Coelostylodon, new genus Etymology. Greek koilos, hollow, stylos, pillar, odon, tooth. The name is meant to recall former reference to Acoelodiis and resemblance to Pleurostylodon. It is also consonant with much Ameghinian nomenclature. Type-species. Coelostylodon florentinoameghinoi, new species, injra. Known distribution. Casamayoran, Argentine Patagonia. Diagnosis. Primitive notoungulates with complete, nearly closed dentition. Upper canine small and fully incisiform. Cheek teeth brachydont, P--M^ soon wearing so that crown presents a single fossa, without complex folds or anterior opening. M^-^ with flattened, slightly bifid lingual faces. M^^ with slight para- style and paracone folds and very feeble metacone swelling on ectolophs, no mesostyle. M^ subtriangular, with short but distinct metaloph, longer than M' or M- and almost as long as Figure 5. Coelostylodon florentinoameghinoi, new genus and species. Holotype, MMP 1723M. Right C and pa - M^. X W2. Discussion. This genus is essentially that called Acoelodus by Ameghino (1901: 467) and discussed by me (Simpson, 1967: 57) under that name, but that apphcation of the name can no longer be sustained. The type-species of Acoelodus is A. oppositus Ameghino, 1897 (p. 454). The holotype of that species is MACN 10770, a fragment of a left mandibular ramus with much worn P and part of Pj. That specimen is essentially indeterminate. In 1901 Ameghino referred to the species a poorly preserved skull, MACN 10753, and redefined the genus essentially on the basis of. 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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