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Ignavusaurus rachelis
Taxonomy
Ignavusaurus rachelis was named by Knoll (2010). Its type specimen is BM HR 20, a partial skeleton, and it is a 3D body fossil. Its type locality is Ha Ralekoala, which is in a Hettangian/Sinemurian terrestrial siltstone in the Elliot Formation of Lesotho. It is the type species of Ignavusaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Ignavusaurus rachelis Knoll pp. 814-815 figs. 2-14 |
| 2011 | Ignavusaurus rachelis Apaldetti et al. p. 4 |
| 2021 | Ignavusaurus rachelis Peyre de Fabrègues et al. p. 327 |
| 2024 | Ignavusaurus rachelis Barrett and Choiniere p. 1 |
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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.
†Ignavusaurus rachelis Knoll 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Knoll 2010 | A non-sauropod sauropodomorph dinosaur with the following unique combination of character-states: transverse width of the ventral ramus of the postorbital greater than its rostrocaudal width at midshaft; height of the postorbital rim of the orbit raised so that it projects laterally to the caudal dorsal process; first dentary tooth adjacent to symphysis; teeth linearly placed within the jaws; orientation of the dentary tooth crowns slightly procumbent; distribution of the serrations along the mesial and distal carinae of the tooth restricted to the apical half of the crown; 14 vertebrae between cervicodorsal transition and primordial sacral vertebrae; transverse processes of the dorsal vertebrae dorsally directed; caudal margin of middle dorsal neural spines concave in lateral view with a projecting caudodorsal corner; first caudal centrum shorter than high; shape of the metacarpal V about as wide as it is long with a strongly convex proximal articulation surface; caudal margin of the postacetabular process of the ilium bluntly pointed; lateral margins of the pubic apron concave in dorsal view; no longitudinal dorsolateral sulcus on proximal ischium; roughly hemispherical femoral head with no sharp medial distal corner; subrectangular astragalus in proximal view; pyramidal process on the craniolateral corner of the proximal surface of the astragalus; transverse width of the proximal end of the fifth metatarsal 50 % of the length of this bone. Although none of these features are proper to Ignavusaurus rachelis, they do not occur in this combination in any other taxon. |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Hettangian to the top of the Sinemurian or 201.40000 to 192.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hettangian - Sinemurian | Lesotho (Mafeteng) | Ignavusaurus rachelis (216627) | |
| Hettangian - Sinemurian | Lesotho (Qacha's Nek) | Ignavusaurus rachelis (type locality: 99624) |