Deinodon horridus Leidy, 1856

Sahni, Ashok, 1972, The vertebrate Fauna of the Judith River formation, Montana, Bulletin of the American Museum of Natural History 147 (6), pp. 319-416 : 358

publication ID

https://doi.org/ 10.5281/zenodo.3382461

DOI

https://doi.org/10.5281/zenodo.3512166

persistent identifier

https://treatment.plazi.org/id/1A7187CF-FFC3-1777-FDAE-FA31E0075860

treatment provided by

Plazi

scientific name

Deinodon horridus Leidy, 1856
status

 

Deinodon horridus Leidy, 1856

Deinodon horridus LEIDY, 1856 , p. 72 View Cited Treatment .

Aublysodon mirandus LEIDY, 1868, p. 198 View Cited Treatment .

Aublysodon lateralis COPE, 1876b, p. 248 View Cited Treatment .

Laelaps incrassatus COPE, 1876a, p. 248 View Cited Treatment ; 1876b, p. 341 View Cited Treatment .

Laelaps hazenianus COPE, 1876b, p. 343 View Cited Treatment .

Ornithomimus grandis MARSH, 1890 , p. 85 View Cited Treatment .

Dryptosaurus kenabekides HAY, 1899, p. 348 View Cited Treatment .

Gorgosaurus libratus LAMBE, 1914, p. 13 View Cited Treatment .

Deinodon horridus was proposed by Leidy (1856) for about a dozen teeth collected by Hayden from the Judith River Formation. This species was the first of the carnivorous dinosaurs to be recovered from the Upper Cretaceous sediments of the American continent. The collection of teeth on which the genus was based consists of two distinct morphological types, although Leidy (1856, p. 73; 1860, p. 144) considered them as belonging to a single species. Leidy (1860, p. 145) correctly guessed that the differences involved in the two groups of teeth were positional in nature and suggested that the teeth with U-shaped cross sections were incisors. Later, Leidy (1868, p. 198) erected a separate genus, Aublysodon , for the inclusion of those teeth he had earlier regarded as incisors. These teeth have serrated crests on the posterior side. Cope (1876a, 1876b) described a number of species from the Judith River Formation under the genus Laelaps , the type of which is L. aquilunguis , obtained from New Jersey. The genus Aublysodon was placed in synonymy with Deinodon by Matthew and Brown (1922). Of the three species of Laelaps collected from the Judith River Formation, two, L. explanatus and L. falculus , were referred to Dromaeosaurus and the other, L. incrassatus , was transferred to Deinodon by Matthew and Brown (1922).

On the basis of the dentition it is not possible to separate the closely related genera Gorgosaurus and Deinodon . As suggested by a number of authors including Matthew and Brown (1922, p. 383), and Russell (1964, p. 13), the genus Gorgosaurus is probably synonymous with the Judith River Formation Deinodon . Lambe (1914) described G. libratus from the Oldman Formation and then restudied it in greater detail (Lambe, 1917) on the basis of more complete material than that known for Deinodon . The name Deinodon , however, has priority and no differences can be shown to exist between the type specimen of Deinodon and material of Gorgosaurus . The name Deinodon should be retained for the large carnivorous dinosaur found in the Judith River and Oldman formations.

The present collection consists of a number of teeth similar to those described by Leidy (1856) and later figured by him ( Leidy, 1860, pl. 9, figs. 21-48) View Figure . AMNH 8513 View Materials is a large saber-shaped linguolabially compressed tooth. Both its anterior and posterior edges are serrated. It is either a maxilla or dentary tooth ( fig. 8M, N View FIG ). The premaxillary teeth are small with a Ushaped cross section. Morphologically similar, but larger, teeth come from the anterior part of the dentary. The premaxillary teeth ( AMNH 8514 View Materials , fig. 8Q, R View FIG ) are usually smaller than the anterior dentary teeth ( AMNH 8515 View Materials , fig. 80, P View FIG ) and have serrated crests lateral to the apex of the tooth that become more posterior toward the base of the tooth. A strong median keel is present that is not found in the larger dentary teeth.

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The type specimen of Ornithomimus grandis Marsh (1890) was supposedly recovered from the Eagle Sandstone, but probably came from the Judith River Formation, and was referred by Gilmore (1920) to Deinodon .

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Dinosauria

Family

Tyrannosauridae

Genus

Deinodon

Loc

Deinodon horridus Leidy, 1856

Sahni, Ashok 1972
1972
Loc

Gorgosaurus libratus

Lambe 1914: 358
1914
Loc

Dryptosaurus kenabekides

Hay 1899: 348
1899
Loc

Ornithomimus grandis

Marsh 1890: 85
1890
Loc

Aublysodon lateralis

Cope 1876: 248
1876
Loc

Laelaps incrassatus

Cope 1876: 248
Cope 1876: 341
1876
Loc

Laelaps hazenianus

Cope 1876: 343
1876
Loc

Aublysodon mirandus

Leidy 1868: 198
1868
Loc

Deinodon horridus LEIDY, 1856

Leidy 1856: 72
1856
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