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Simbirskiasaurus birjukovi
Taxonomy
Simbirskiasaurus birjukovi was named by Otschev and Efimov (1985) [Storrs, Arkhangelsky & Efimov (2000: table 11.2) incorrectly cited ‘SGU 104a/22’ as the holotype specimen]. Its type specimen is YKM 65119, a partial skull, and it is a 3D body fossil. Its type locality is Right bank of the Volga River, 25 km upstream from Ul'yanovsk, which is in a Barremian marine horizon in the Simbirskites Clay Formation of the Russian Federation.
It was recombined as Platypterygius birjukovi by Storrs et al. (2000), Maisch and Matzke (2000) and Maisch (2010); it was considered a nomen dubium by McGowan and Motani (2003).
It was recombined as Platypterygius birjukovi by Storrs et al. (2000), Maisch and Matzke (2000) and Maisch (2010); it was considered a nomen dubium by McGowan and Motani (2003).
Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Simbirskiasaurus birjukovi Otschev and Efimov figs. 1, 2 |
| 2000 | Platypterygius birjukovi Maisch and Matzke p. 82 |
| 2000 | Platypterygius birjukovi Storrs et al. p. 201 |
| 2010 | Platypterygius birjukovi Maisch |
| 2014 | Simbirskiasaurus birjukovi Fischer 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.
†Simbirskiasaurus birjukovi Otschev and Efimov 1985
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| V. G. Otschev and V. M. Efimov 1985 | "Ichthyosaurs four meters or somewhat more in length. Skull high, with marked bend of roof at level of anterior part of nostrils. Orbits relatively low and subquadratic. Jugal bones do not reach premaxillary; jaw bones long but do not extend to margins of external nasal apertures. Two apertures posterior to each nasal opening. Teeth with conical crowns that are slightly curved medially at their ends and slightly inflated at their bases. Their roots are markedly thickened." |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: Early/Lower Barremian or 130.00000 to 125.45000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Barremian | Russian Federation (Ul'yanovsk) | Ichthyosauria indet. (type locality: 100186) |