Open Paleo

Caenagnathasia

Currie et al., 1993 see-NAG-na-THAY-zhee-a

Combination of Caenagnathidae (the family to which it belongs, from Greek kainos meaning 'recent' and gnathos meaning 'jaw') with Asia (the continent of its origin). Full meaning: 'recent jaw from Asia'.

93.9–89.8 million years ago Turonian, Late Cretaceous
Late Cretaceous stages

Caenagnathasia is a genus of small caenagnathid oviraptorosaurian theropod from the Late Cretaceous of Uzbekistan.

Diagnosis

  1. Depression on posteroventral margin of symphysis is not hourglass shaped (unlike some Caenagnathus specimens)
  2. No circular pit or notch in dentary for reception of anterior tip of prearticular
  3. Fluting on lingual margin of occlusal edge less distinct, with no tooth-like apical projections on ridges
  4. First anterior occlusal groove relatively larger; first pair of lateral occlusal ridges do not meet ventrally to separate it from symphysial shelf concavity
  5. No second anterior occlusal groove and no tubercles on midline or at base of first lateral occlusal ridge
  6. Lateral groove narrower and deeper; no foramina in floor of midline depression of symphysial shelf

Species

Caenagnathasia martinsoni Currie et al., 1993

Type species

Named for Gerbert Genrikhovich Martinson.

Holotype
CCMGE 401/12457 , F.N. Chernyshev Central Museum of Geological Exploration
Material
Anterior region of fused dentaries.
Horizon
lower Bissekty Formation, Turonian, Late Cretaceous , 93.9–89.8 million years ago
Locality
CDZh-17a, Navoiy, Uzbekistan

References

  1. Currie, P. J.; Godfrey, S. J.; Nessov, L. (1993). New caenagnathid (Dinosauria: Theropoda) specimens from the Upper Cretaceous of North America and Asia. Canadian Journal of Earth Sciences 30(10): 2255-2272. Canadian Science Publishing. doi:10.1139/e93-196 currie1993a