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Acerosodontosaurus
Taxonomy
Acerosodontosaurus was named by Currie (1980). Its type is Acerosodontosaurus piveteaui.
It was assigned to Younginidae by Currie (1980); to Younginiformes by Benton (1985); to Acerosodontosauridae by Carroll (1988); and to Younginiformes by Bickelmann et al. (2009).
It was assigned to Younginidae by Currie (1980); to Younginiformes by Benton (1985); to Acerosodontosauridae by Carroll (1988); and to Younginiformes by Bickelmann et al. (2009).
Species
A. piveteaui (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1980 | Acerosodontosaurus Currie p. 501 |
| 1985 | Acerosodontosaurus Benton p. 154 |
| 1988 | Acerosodontosaurus Carroll |
| 2009 | Acerosodontosaurus Bickelmann et al. p. 652 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. J. Currie 1980 | Diapsid reptiles of the family Younginidae. Differs from Youngina, Heleosaurus, and Galesphyrus in having larger number of maxillary teeth. Marginal teeth slender and sharply pointed in contrast to the blade-like teeth of Heleosaurus or the peg-like teeth of Galesphyrus. Skull is wider in the antorbital region than Youngina. Cervical centra shorter than the thoracic centra, whereas in Heleosaurus the centra are about the same length throughout the column; neural spines taller and longer than those of Youngina, Galesphyrus, Heleosaurus, or Heleosuchus . Ventromedial-dorsolateral width of the pubis greater than its length, distinguishing it from Youngina, Galesphyrus, and Heleosaurus; iliac blade extends relatively farther caudad than that of Youngina. Radius has twisted appearance that is characteristic of Champsosaurus, but not reported in any other primitive diapsid; ulna (excluding olecranon) longer than radius, whereas in Youngina and Galesphyrus, the radius is longer; intermedium and ulnare relatively shorter than in Galesphyrus; medial centrale smaller than lateral centrale. Acerosodontosaurus is distinctive compared with a second younginid from Madagascar (Piveteau 1926, p. 171; Carroll, in preparation) in that it possesses a more gracile humerus, has an ulna that is longer than the radius, and has a pubis with different proportions. |
Measurements
No measurements are available
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| Source: subc = subclass, subp = subphylum, p = phylum | |||||
| References: Carroll 1988, Kiessling 2004 | |||||