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Aucasaurus garridoi

Reptilia - Abelisauridae

Taxonomy
Aucasaurus garridoi was named by Coria et al. (2002). Its type specimen is MCF PVPH-236, a skeleton, and it is a 3D body fossil. Its type locality is Auca Mahuevo theropod site, which is in a Campanian/Campanian lacustrine - small mudstone/sandstone in the Anacleto Formation of Argentina. It is the type species of Aucasaurus.

Synonymy list
YearName and author
2002Aucasaurus garridoi Coria et al. p. 460 figs. 2-4
2003Aucasaurus garridoi Chiappe et al. p. 100
2004Aucasaurus garridoi Coria and Arcucci p. 597
2004Aucasaurus garridoi Juárez Valieri and Fiorelli p. 36
2004Aucasaurus garridoi Martínez et al. p. 578
2004Aucasaurus garridoi Novas et al. p. 68
2004Aucasaurus garridoi Tykoski and Rowe p. 49
2005Aucasaurus garridoi Candeiro and Martinelli p. 9
2005Aucasaurus garridoi Novas et al. p. 169
2006Aucasaurus garridoi Candeiro et al. p. 935
2006Aucasaurus garridoi Coria et al. p. 1288
2007Aucasaurus garridoi Malkani
2007Aucasaurus garridoi Sampson and Witmer p. 33
2008Aucasaurus garridoi Carrano and Sampson p. 191
2008Aucasaurus garridoi Maganuco et al. p. 248
2010Aucasaurus garridoi Garrido p. 99
2010Aucasaurus garridoi Paulina Carabajal and Canale p. 253
2011Aucasaurus garridoi Juárez Valieri et al. p. 167
2011Aucasaurus garridoi Paulina Carabajal p. 793
2011Aucasaurus garridoi Ruiz et al. p. 1271
2012Aucasaurus garridoi Burch and Carrano p. 1
2012Aucasaurus garridoi Candeiro et al. p. 326
2012Aucasaurus garridoi Candeiro and Harris p. 76
2013Aucasaurus garridoi Fernandes de Azevedo et al. p. 135
2013Aucasaurus garridoi Furtado et al. p. 109
2013Aucasaurus garridoi Machado et al. p. 447
2013Aucasaurus garridoi Novas et al. p. 176
2014Aucasaurus garridoi Dalman p. 174
2014Aucasaurus garridoi Delcourt and Grillo p. 311
2014Aucasaurus garridoi Hendrickx and Mateus p. 19
2014Aucasaurus garridoi Méndez p. 99
2014Aucasaurus garridoi Xing et al. p. 1653
2016Aucasaurus garridoi Canale et al. p. 18
2016Aucasaurus garridoi Filippi et al. p. 210
2016Aucasaurus garridoi Ratsinbaholison et al. p. 281
2018Aucasaurus garridoi Delcourt p. 2
2018Aucasaurus garridoi Delcourt and Grillo p. 516
2020Aucasaurus garridoi de Souza et al. p. 2
2022Aucasaurus garridoi Méndez et al. p. 1
2023Aucasaurus garridoi Baiano et al. p. 6

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
Romeriida
Diapsida()
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Theropoda()
Neotheropoda
Ceratosauria()
superfamilyAbelisauroidea
familyAbelisauridae
Brachyrostra
genusAucasaurus
speciesgarridoi

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.

Aucasaurus garridoi Coria et al. 2002
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Diagnosis
ReferenceDiagnosis
R. A. Coria et al. 2002A carnotaur theropod whose skull differs from Carnotaurus sastrei by having a longer and lower rostrum and external antorbital fenestra, a horizontal ventral margin of the latter, complete lateral exposure of the maxillary fenestra, frontal swells instead of horns, and a sigmoidal outline of the dentigerous margin of the maxilla. Several postcranial differences also distinguish Aucasaurus garridoi from Carnotaurus sastrei: a less developed coracoidal process, a forelimb relatively longer than Carnotaurus, a humerus with a slender and craniocaudally compressed shaft and well-defined condyles, a proximal radius lacking a hooked ulnar process, and chevrons with dorsally open haemal canals. The last character-state is interpreted as an autapomorphy of Aucasaurus because the opposite condition is found in the abelisaurs Carnotaurus and Ilokelesia (Coria and Salgado, 1998).
M. T. Carrano and S. D. Sampson 2008Abelisaurid with (1) complete lateral exposure of the maxillary fenestra and (2) frontal swells instead of horns (modified from Coria et al. 2002).
M. A. Baiano et al. 2023The original diagnosis established by Coria, Chiappe & Dingus (2002) was largely based on morphological comparisons with Carnotaurus and mentioning only one autapomorphy (i.e., anterior haemal arches with proximally opened neural canal). Here, we expand the diagnosis to include the following unique features of the axial skeleton: (1) atlas with a subcircular articular surface; (2) interspinous accessory processes extended to sacral and caudal neural spine; (3) presence of a tubercle lateral to the prezygapophysis of mid caudal vertebrae (a similar structure is mentioned in Aoniraptor; Motta et al., 2016); (4) presence of pneumatic foramina laterally to the base of the neural spine in the anterior caudal vertebrae; (5) presence of a prominent tubercle and extensive rugosity on the lateral rim of the transverse processes of caudal vertebrae fourth to twelfth; (6) presence of a small ligamental scar near the anterior edge of the dorsal surface in the anteriormost caudal transverse processes; (7) distinct triangular process located at the fusion point of posterior middle gastralia. In addition, according to Coria, Chiappe & Dingus (2002), the skull of Aucasaurus differs from that of Carnotaurus sastrei in having a longer and lower rostrum, frontal swells instead of horns, and a sigmoidal outline of the dentigerous margin of the maxilla. Several postcranial differences also distinguish Aucasaurus garridoi from Carnotaurus sastrei: a less developed coracoidal process, a forelimb relatively longer, a humerus with a slender and craniocaudally compressed shaft and well-defined condyles, and a proximal radius lacking a hooked ulnar process.