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Alxasaurus elesitaiensis
Taxonomy
Alxasaurus elesitaiensis was named by Russell and Dong (1994). Its type specimen is IVPP 88402, a partial skeleton, and it is a 3D body fossil. Its type locality is Elesitai, SCDP, which is in an Aptian lacustrine claystone in the Bayangobi Formation of China. It is the type species of Alxasaurus. It was considered monophyletic by Currie (2000).
Synonymy list
| Year | Name and author |
|---|---|
| 1994 | Alxasaurus elesitaiensis Russell and Dong p. 2108 figs. 1-15 |
| 1995 | Alxasaurus elesitaiensis Clark et al. p. 24A |
| 1995 | Alxasaurus elesitaiensis Nessov p. 35 |
| 2000 | Alxasaurus elesitaiensis Currie p. 439 |
| 2003 | Alxasaurus elesitaiensis Rauhut p. 41 |
| 2004 | Alxasaurus elesitaiensis Clark et al. p. 152 |
| 2006 | Alxasaurus elesitaiensis Zanno p. 637 |
| 2007 | Alxasaurus elesitaiensis Li et al. p. 545 |
| 2007 | Alxasaurus elesitaiensis Turner et al. p. 26 |
| 2009 | Alxasaurus elesitaiensis Zanno et al. p. S4 |
| 2010 | Alxasaurus elesitaiensis Zanno p. 196 |
| 2012 | Alxasaurus elestaiensis Qian et al. p. 341 |
| 2013 | Alxasaurus elesitaiensis Pu et al. |
| 2019 | Alxasaurus elesitaiensis You et al. p. 8 |
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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.
†Alxasaurus elesitaiensis Russell and Dong 1994
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Zanno 2010 | Russell & Dong (1993, p. 2108) provided the original diagnosis for Alxasaurus: “dentary teeth number approximately 40; symphyseal region of dentary bears teeth; ribs not fused to cervical centra; ligament pits often well developed in manual phalanges; ilium not greatly
shortened craniocaudally; preacetabular ala moderately expanded, ungual shorter than or subequal to first phalanx in pedal digits II-IV”. The original diagnosis suffers from the same problems as that given for Beipiaosaurus in that it is composed of plesiomorphies which, in light of recent discoveries, are no longer of use as differentiae (see also Clark et al. 2004). Although clearly necessary, the rediagnosis of Alxasaurus must await the availability of the type materials (see Materials and Methods). A single autapomorphic feature can be recognized on the type materials available for this study: cranial blade of proximal chevrons with profound lateral flare at region of bifurcation into articular facet (Fig. 2F–G). |
Measurements
No measurements are available
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| Source: superf = superfamily, o = order | |||||
| References: Holtz et al. 2000, Marsh 1875 | |||||