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Tehuelchesaurus benitezii
Taxonomy
Tehuelchesaurus benitezii was named by Rich et al. (1999). Its type specimen is MPEF-PV 1125 and is a 3D body fossil. Its type locality is Estancia Fernández, which is in an Oxfordian/Tithonian lacustrine sandstone/mudstone in the Cañadón Calcáreo Formation of Argentina. It is the type species of Tehuelchesaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Tehuelchesaurus benitezii Rich et al. p. 63 figs. 1, 4-14 |
| 2002 | Tehuelchesaurus benitezii Wilson p. 249 |
| 2004 | Tehuelchesaurus benitezii Upchurch et al. p. 263 |
| 2005 | Tehuelchesaurus benitezii Salgado and Coria p. 434 |
| 2011 | Tehuelchesaurus benitezii Carballido et al. p. 608 |
| 2012 | Tehuelchesaurus benitezii D'Emic |
| 2014 | Tehuelchesaurus benitezii Mocho et al. |
| 2015 | Tehuelchesaurus benitezi Salgado et al. p. 418 |
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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.
†Tehuelchesaurus benitezii Rich et al. 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. L. Carballido et al. 2011 | The taxon can be diagnosed by the autapomorphic presence of two accessory laminae in the infradiapophyseal fossa of the middle dorsal vertebrae. The accessory lamina 1 runs posterodorsally from the paradiapophyseal lamina and merges dorsally with the accessory lamina 2, which in turn runs posteroventrally from this point to the posterior centrodiapophyseal lamina. Further apomorphies include the presence of an accessory and laterally oriented lamina on the lateral surface of the intrapostzygapophyseal lamina and the strongly anteroposteriorly expanded and very robust distal end of the humerus. Tehuelchesaurus further differs from all other sauropods in the unique combination of the following characters: absence of the prezygoparapophyseal lamina in the middle and posterior dorsal vertebrae (reverse of the plesiomorphic sauropodomorph condition; see discussion below); pres- ence of an accessory posterior centrodiapophyseal lamina, giving the impression of a ventrally bifurcated pcdl (convergently acquired in Titanosauria); a single intrapostzygapophyseal lamina in at least the mid-dorsals (uncertain in other dorsals; convergently present in diplodocids and some basal taxa) that supports the weakly developed hyposphene in middle and posterior dorsal vertebrae; neural spines of dorsal vertebrae longer anteroposteriorly than wide transversely (reversal to the ancestral sauropodomorph condition, also present in Jobaria (Sereno et al., 1999) and Galvesaurus (Barco, 2009); absence of lateral expansion in the dorsal end of the neural spine of dorsal vertebrae; absence of postspinal lamina in dorsal neural spines; greatest anteroposterior width of the acromion process of the scapula over the glenoid almost four times the minimum width of the shaft. |
Measurements
No measurements are available
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| Source: infrao = infraorder | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Late/Upper Oxfordian to the top of the Tithonian or 157.90000 to 143.10000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oxfordian - Tithonian | Argentina (Chubut) | Camarasauridae indet. (type locality: 51938) |