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Leonerasaurus taquetrensis
Taxonomy
Leonerasaurus taquetrensis was named by Pol et al. (2011). Its type specimen is MPEF-PV 1663, a partial skeleton, and it is a 3D body fossil. Its type locality is Cañadón Las Leoneras, which is in a Pliensbachian lacustrine claystone in the Las Leoneras Formation of Argentina.
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Leonerasaurus taquetrensis Pol et al. p. 4 figs. 3-13 |
| 2020 | Leonerasaurus taquetrensis Moro 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.
†Leonerasaurus taquetrensis Pol et al. 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Pol et al. 2011 | Leonerasaurus is a small basal sauropodomorph diagnosed by a unique combination of characters including the following autapomorphies: anterior teeth with low, spoon-shaped crowns (SI = 1.3); dorsosacral rib attached to preacetabular process of ilium (paralleled in Lufengosaurus); neural arches of primordial sacrals positioned on the anterior half of the centrum; caudosacral rib directed anterolaterally; humeral deltopectoral crest low and medially deflected along its distal half; flattened ischial shafts (paralleled in Anchisaurus). Leonerasaurus differs from most basal sauropodomorphs in the presence of the following characters: straight anterior region of the dentary; slightly procumbent teeth without marginal denticles and with convex labial surface and concave lingual surface; four sacral vertebrae, with two primordial sacrals bounded by a dorsosacral and a caudosacral; preacetabular process of ilium exceeding pubic peduncle and dorsoventrally low (except for Anchisaurus and Mussaurus). Finally, several plesiomorphic features distinguish Leonerasaurus from basal sauropods: teeth lacking labial or lingual grooves; posterior teeth with large denticles oriented at 45 degrees from tooth’s margin and slightly developed wrinkling pattern; vertebral centra amphicoelous and acamerate; cervical vertebrae low and moderately elongated, without postzygodiapophyseal lamina, with elongated prezygapophyses; dorsal vertebrae with low neural arches and neural spines elliptical in cross section; absence of spinoprezygapophyseal laminae in all dorsals and of prezygodiapophyseal lamina in mid-dorsals; posterior dorsals with dorsoventrally low hyposphene-hypantrum; proximal metatarsal II hour-glass shaped in proximal view. |
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: Early/Lower Pliensbachian or 192.90000 to 184.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Pliensbachian | Argentina (Chubut) | Leonerasaurus taquetrensis (type locality: 103445) |