. Breviora. 16 BREVIORA No. 295 DiNODONTOSAURUS PLATYGNATHUS sp. nOV. Holotype. No. 65-XI-14-5 Museo de la Plata, La Plata, Argen- tina, fragmentary skull and lower jaw. Collected by the 1964-1965 expedition of the Museo de la Plata and the Museum of Com- parative Zoology. Horizon and locality. From an exposure in the Triassic Chah- ares Formation, about P/i miles north-north-west of the point where the Gualo River emerges from the Piano del Gualo, in west- ern La Rioja Province, Argentina. Referred material. Specimen No. 149R, Divisao de Geologia e Mineralogia, Ministerio das Minas e Energia,
. Breviora. 16 BREVIORA No. 295 DiNODONTOSAURUS PLATYGNATHUS sp. nOV. Holotype. No. 65-XI-14-5 Museo de la Plata, La Plata, Argen- tina, fragmentary skull and lower jaw. Collected by the 1964-1965 expedition of the Museo de la Plata and the Museum of Com- parative Zoology. Horizon and locality. From an exposure in the Triassic Chah- ares Formation, about P/i miles north-north-west of the point where the Gualo River emerges from the Piano del Gualo, in west- ern La Rioja Province, Argentina. Referred material. Specimen No. 149R, Divisao de Geologia e Mineralogia, Ministerio das Minas e Energia, Rio de Janeiro. Description. The type specimen consists only of the palatal and occipital regions of a large skull, and of an almost complete lower jaw (Fig. 11). The bluntly-ending snout and the presence of downwardly directed canine tusks show that the specimen prob- ably belongs to the genus Dinodontosaurus. The anterior end of the lower jaw, however, is elongated and tapers to a relatively thin. Figure II. Dinodontosaurus platygnathus, type specimen. Lateral view of lower jaw, x Vi (for abbreviations, see p. 26). point, unlike that of Dinodontosaurus turpior. It at first seemed likely that this was merely an aberrant type of distortion, but the existence of an almost identical lower jaw (specimen No. DGM 149R) in the Rio de Janeiro collection from the Santa Maria Formation of Brazil makes this explanation less plausible, and sug- gests instead that a different species of Dinodontosaurus may be represented. The fragments of the palate and occiput associated with the type specimen unfortunately do not show any other fea- tures by which the species could be distinguished from D. turpior, but it is felt nevertheless that the characters of the lower jaw merit specific distinction as Dinodontosaurus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr
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