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Paraxenisaurus normalensis
Taxonomy
Paraxenisaurus normalensis was named by Serrano-Brañas et al. (2020). Its type specimen is BENC 2/2-001, a set of postcrania (proximal manual phalanx II-2 or III-3, partial right tarsals (astragalus and calcaneum) and partial left and right peses that include the shaft and distal end o), and it is a 3D body fossil. Its type locality is Las Pedreras (MUDE Loc. 13), which is in a Campanian terrestrial horizon in the Cerro del Pueblo Formation of Mexico. It is the type species of Paraxenisaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Paraxenisaurus normalensis Serrano-Brañas et al. |
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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.
†Paraxenisaurus normalensis Serrano-Brañas et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. I. Serrano-Brañas et al. 2020 | A large deinocheirid ornithomimosaur that possesses the following characteristics [unique features (autopomorphies) are mark with an asterisk]: (1) a strongly curved and laterally compressed manual ungual I that has a distally placed flexor tubercle divided by a deep sulcus; (2) a deeply concave proximal articular surface of manual ungual I, which is twice taller than wide, giving it an elliptical outline*; (3) a metacarpal III that has an expanded proximal articular end, which is similar in width with the one of metacarpal II; (4) posterior caudal vertebrae, in which low dorsoventrally prezygapophyses with nearly vertical articulation surfaces are found on the most anterior caudal vertebrae, and prezygapophyses that face ventromedially are found on the most posterior caudal vertebrae*; (5) a non-arctometatarsalian pes, where the proximal end of metatarsal III is expanded and has a proximal ovoid outline*, suggesting its complete exposure in proximal, anterior and posterior views; (6) the posterior surface of the distal quarter of metatarsal II bears an attachment site for metatarsal I, indicating the presence of pedal digit I; (7) the medial condyle of metatarsal II flares laterally to a greater extent in comparison to other ornithomimosaurian dinosaurs*; (8) the distal end of metatarsal III is wider transversely than anteroposteriorly and has a semi-ginglymoid articular surface; (9) distinctively broad and ventrally curved pedal unguals that angled downward with respect to the proximal articular surface and depending on the digit, the proximodorsal process becomes slightly enlarge and changes its position from nearly horizontal to mostly vertical, adopting a lip-shaped appearance; and (10) pedal unguals with a rounded, large foramen on the medial side* and a deep ventral fossa that surrounds a strongly developed, ridge-like flexor tubercle. |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| Reference: Averianov and Yarkov 2004 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | Mexico (Coahuila) | Paraxenisaurus normalensis (type locality: 136544) |