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Sefapanosaurus zastronensis
Taxonomy
Sefapanosaurus zastronensis was named by Otero et al. (2015). Its type specimen is BP/1/386, a set of limb elements (incomplete, articulated left pes), and it is a 3D body fossil. Its type locality is Zastron, which is in a Norian/Hettangian terrestrial horizon in the Elliot Formation of South Africa. It is the type species of Sefapanosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Sefapanosaurus zastronensis Otero et al. p. 591–592 fig. 2–16 |
| 2021 | Sefapanosaurus zastronensis Müller and Garcia p. 5 |
| 2023 | Sefapanosaurus zastronensis Sciscio et al. p. 3 |
| 2024 | Sefapanosaurus zastronensis Barrett and Choiniere p. 2 |
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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.
†Sefapanosaurus zastronensis Otero et al. 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Otero et al. 2015 | Sefapanosaurus zastronensis is a medium-sized basal sauropodomorph distinguished from other nonsauropod sauropodomorphs by the following autapomorphies present in the holotype: tall ascending process of the astragalus, being 35% of the mediolateral length of the astragalar body; T-shaped, triradiate cross-section of ascending process of the astragalus; and ascending process of the astragalus framed medially and caudally by well-developed, straight, thick ridges, which have subcircular cross-sections.
Additionally, the material referred to S. zastronensis (BP/1/7409–7455) differs from other nonsauropod sauropodomorphs by the following unique combina- tion of characters (autapomorphies denoted with an asterisk): slit-shaped posterior dorsal neural canal; length of the base of the proximal neural spine greater than half the length of the neural arch; cross- sectional shape of distal caudal centra square- shaped; long ridge extending from the craniodorsal margin of the coracoid to the coracoid foramen*; craniomedial process of the ulna twice as long as the craniolateral process and distally tapered*; presence of biceps tubercle and caudodistal tubercles of the radius; distal carpal I with proximally pointing tip on the palmar surface, giving a triangular shape in palmar view*; strongly concave medial margin of meta- carpal I; ventral margin of phalanx I.1 well devel- oped with a proximally pointing tip; metacarpal V longer than wide with flat proximal surface; first meta- carpal short and wide (proximal width is more than 100% of the total length of the bone); craniomedial projection on the distal end of the fibula*. |
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 Norian to the top of the Hettangian or 227.30000 to 199.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Norian - Hettangian | South Africa (Free State) | Sefapanosaurus zastronensis (type locality: 170616) |