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