Genus: Lagerpetonidae gen. sp. indet 1 (Martinez, Apaldetti, Alcober, Colombi, Sereno, Fernandez, Malnis, Correa, and Abelin, 2013)

Classification: Archosauria - Dinosauromorpha - Lagerpetonidae

Type species: none

Other Species: none

Diagnosis: none

Holotype: none

Referred Specimens: PVSJ 883: Distal end of the left femur.

Time: Late Carnian, Late Triassic

Horizon: Near the base of the Ischigualasto Formation.

Location: Valle Pintado in Ischigualasto Provincal Park, San Juan Province, Argentina.

Total length:

Mass:

Diagnosis:

Comments:PVSJ 883 was added to the data matrix of Nesbitt et al. (2010) and was positioned within Lagerpetidae along with Lagerpeton chanarensis, Trilicosaurus rapax, Dromomeron romeri, and Dromomeron gregorii. PVSJ 883 was positioned as the sister taxon to the two Dromomeron species (Mart´ınez et al., 2013b).

The femoral shaft is hollow in cross-section, with a medullary cavity occupying approximately one-half the volume of the shaft. Some abrasion of the edges of the distal condyles has occurred. In lagerpetids, the distal end of the femur is diagnostic in several regards. The distal condyles are transversely broad relative to their maximum depth, and the anterior margin is transversely concave. Both of these features are present in PVSJ 883

Illustrations:

Distal end of the femur in Lagerpetidae. Distal end of the left femur of PVSJ 883 from the Ischigualasto Formation in anterior (A), posterior (B), lateral (C), medial (D), proximal (E), and distal (F) views. Distal view
of the left femur (anterior toward top of page) of Lagerpeton chanarensis (G), Dromomeron romeri (H), and Dromomeron gregorii (I) (from Nesbitt et al. (2009). (from Martinez, Apaldetti, Alcober, Colombi, Sereno, Fernandez, Malnis, Correa, and Abelin, 2013)

References:

Martinez, R. N., Apaldetti, C., Alcober, O. A., Colombi, C. E., Sereno, P. C., Fernandez, E., Malnis, P. S., Correa, G. A., and Abelin, D., 2013, Vertebrate succession in the Ischigualsto Formation: In: Basal sauropodomorphs and the vertebrate fossil record of the Ischigualasto Formation (Late Triassic: Carnian-Norian) of Argentina, SVP Memoir 12, p. 10-30.

© Tetrapoda Database Roman Ulansky roman.ulansky@gmail.com or adios85@mail.ru