Describer

Huene, 1929 / Cuvier & Valenciennes, 1832

Time

Cretaceous Late Campanian Maastrichtian

Classification

Saurischia Sauropodomorpha Sauropoda Incerate Sedis

Diet

Herbivore

Fossilsite

Bajo Barreal Formation, Castillo Formation, Laguna Palacios Formation, Provincia de Chubut, Argentina

Fall Under

Campylodoniscus

Info

Genus

Campylodoniscus (Kuhn, 1961) > Campylodoniscus ameghinoi (Huene, 1929) = Campylodon ameghinoi (Huene, 1929) p.o.

Named for Camarasaurus-like teeth \\\\\\\"slightly curved in the lingual direction.\\\\\\\" (Preoccupied by Campylodon Cuvier & Valenciennes 1832.)

Part of: Bonaparte, J. F. and Z. Gasparini. 1979. Los saurópodos de los grupos Neuquén y Chubut, y sus relaciones cronologicas. Actas del VII Congreso Geológico Argentino, Neuquén 2:393-406. [The sauropods of the Neuquén and Chubut groups and their chronological relations]

_{Translated by Jeffrey A. Wilson, Museum of Paleontology, University of Michigan, January 2003.}

Campylodon ameginoi Huene, 1929. An. Mus. La Plata, Paleont. Argentina, III, 2nd series, pp. 82-83, pls. 40; figs. 1, 2.

Holotype

An incomplete left maxilla with seven alveoli, in one of these there is a tooth and one replacing; there is also an isolated broken crown.

Geographic Stratigraphic and chronological origin

Western flank of the Sierra San Bernardo, to the west of Lago Musters. Chubut Province, Chubut Group, Castillo, Bajo Barreal, or Laguna Palacios Formation. Pre-Maastrichtian Senonian.

Commentary

The material on which the genus and species are based is truly poor, as the maxilla is incomplete on all its margins except the alveolar margin. It pertains to a sauropod whose dental characters, as is possible to analyze with the fragmentary materials available, appear “…intermediate between the spatulate form of Camarasaurus and the pencil-like form of Diplodocus” (Huene , 1929:83).

Nonetheless, Huene later underscores that J. F. Bonaparte & Z. B. De Gasparini , The sauropods of the, etc. 403 the character of those “resembling in some ways that of Antarctosaurus wichmannianus by its roughened surface5…”. The diagnostic characters of all the sauropods of Patagonia are based on the morphology of the postcranial skeleton, principally the appendicular bones, simply because it rare to find cranial material of any significance. Under these circumstances, it is inadvisable to propose a new genus and species on an incomplete maxilla without basis of comparison; it could well correspond to one of the genera known only from postcranial skeletons (e.g., Argyrosaurus superbus). For this reason and for the peculiarities of this maxilla cited by Huene (op. cit.:109), we consider Campylodon ameghinoi to be a nomen vanum.

_{Source: Polyglot Paleontologist}

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