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Guaibasaurus candelariensis
Taxonomy
Guaibasaurus candelariensis was named by Bonaparte et al. (1999). Its type specimen is MCN-PV 2355, a partial skeleton, and it is a 3D body fossil. Its type locality is Botucarai Hill, BR-287 road, which is in a Norian fine channel fill sandstone/siltstone in the Caturrita Formation of Brazil.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Guaibasaurus candelariensis Bonaparte et al. p. 90 figs. 2-11 |
| 2003 | Guaibasaurus candelariensis Leal and Azevedo p. 71A |
| 2004 | Guaibasaurus candelariensis Langer p. 27 |
| 2005 | Guaibasaurus candelariensis Brea et al. p. 55 |
| 2006 | Guaibasaurus candelariensis Langer and Benton p. 311 |
| 2007 | Guaibasaurus candelariensis Upchurch et al. p. 75 |
| 2008 | Guaibasaurus candelariensis Machado et al. p. 309 |
| 2009 | Guaibasaurus candelariensis Bittencourt and Kellner p. 22 |
| 2010 | Guaibasaurus candelariensis Langer et al. p. 62 |
| 2011 | Guaibasaurus candelariensis Apaldetti et al. p. 1 |
| 2011 | Guaibasaurus candelariensis Langer et al. p. 302 |
| 2013 | Guaibasaurus candelariensis Bittencourt et al. p. 91 |
| 2013 | Guaibasaurus candelariensis Da-Rosa p. R14 |
| 2014 | Guaibasaurus canderlariensis Marzola and Dalla Vecchia p. 13 |
| 2020 | Guaibasaurus candelariensis Moro et al. |
| 2021 | Guaibasaurus candelariensis Müller and Garcia p. 12 |
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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.
†Guaibasaurus candelariensis Bonaparte et al. 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. C. Langer et al. 2011 | Saurischian dinosaur distinguished from all other well-known Triassic members of the group by a unique combination of anatomical features. It differs from typical herrerasaurs (Herrerasaurus, Staurikosaurus) by possessing axially elongated caudal trunk vertebrae, a long postacetabular ala with a well developed brevis fossa, and an unexpanded distal end of the pubis; from neotheropods by the retention of two sacral vertebrae, an unexpanded preacetabular ala, and an uncompressed calcaneum; from members of the sauropodomorph lineage by a narrow distal end of the humerus, and particularly from Saturnalia and Panphagia by a transversally elongated distal end of the tibia. It also differs from Saturnalia, Chindesaurus (PEFO 10395), and Eoraptor, by the absence of a trochanteric shelf, and from the latter by a narrow metacarpal III. In addition, G. candelariensis bears a peculiar proximal expansion at the mid-length of the caudoproximal corner of its astragalus, otherwise recognised only in Silesaurus (ZPAL AbIII 361/20), Chindesaurus (PEFO 10395), and a basal theropod from the Dockum Group of Texas (Nesbitt & Chatterjee 2008). The specimens referred to G. candelariensis match one another in almost every anatomical detail, but autapomorphic traits are hard to establish. Nevertheless, a groove extending dorsoventrally along the cranial part of the iliac antitrochanter and a reduced distal surface of the astragalus (which has cranial and caudal surfaces facing somewhat distally) are seen in both partial skeletons, probably representing unique fea- tures of G. candelariensis. In addition, the caudal process of the pubis in UFRGS PV0725T (not preserved in the holotype) has a unusual transverse groove on the caudal margin. |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||