Nuevo Material Postcraneano de<i>Saurosuchus galilei</i>Reig (Archosauria: Crurotarsi) del Triásico Superior del Centro-Oeste de Argentina

Trotteyn, M. Jimena; Desojo, Julia Brenda; Alcober, Oscar A.

doi:10.5710/amgh.v48i1(265)

Cited by 41 publications

(61 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There are no signs of articulation facets on the lateral margins, which indicate that the osteoderm originated from a single median row of osteoderms and was not part of a paramedian series. Whereas a paramedian row of osteoderms is found along or attached to the cervical and dorsal vertebrae in rauisuchian archosaurs (Peyer et al 2008;Gower and Schoch 2009;Trotteyn et al 2011), single median rows of symmetrical osteoderms originated from the tail section (Peyer et al 2008). Symmetrical and pointed osteoderms, similar to the one in question, are present in Ticinosuchus ferox from the posterior part of the tail dorsally and ventrally, Prestosuchus chiniquensis (UFRGS-PV0629T), and Rauisuchus tiradentes (Lautenschlager 2008).…”

Section: Caudal Osteodermmentioning

confidence: 92%

“…The cervical vertebrae are short and high in Prestosuchus chiniquensis, whereas they are actually considerably longer in ''Prestosuchus'' loricatus 1 (BSPG AS XXV 13). A single cervical vertebra, tentatively referred to Saurosuchus galilei by Sill (1974), is also very elongated (length:height = 3.7:1), but the discovery and recent description of new material, including one complete and several fragmentary cervical vertebrae of Saurosuchus galilei, showed that the respective vertebra described by Sill (1974) did not belong to Saurosuchus galilei, but might possibly belong to another pseudosuchian (Trotteyn et al 2011). The cervicals of Saurosuchus galilei, however, are short and nearly isometric (op.…”

Section: Cervical Vertebraementioning

confidence: 95%

“…This corresponds well with the body size of this species, which represents one of the smallest known rauisuchian archosaurs. Specimens with a comparable body size, as for example Rauisuchus tiradentes (Lautenschlager 2008), show an equally slender scapula, which contrasts the large and expanded scapulae of large species, such as Prestosuchus chiniquensis (von Huene 1942) and Saurosuchus galilei (Trotteyn et al 2011). A small fragmentary element located to the left of the right coracoid was tentatively identified as a possible clavicle by Krebs (1965).…”

Section: Pectoral Girdlementioning

confidence: 97%

“…Within Rauisuchia this feature seems to be equally distributed between the quadrupedal rauisuchoids [e.g. Batrachotomus (Gower and Schoch 2009); Stagonosuchus (see above); Saurosuchus (Trotteyn et al 2011); Postosuchus (Peyer et al 2008)], the bipedal poposauroids [Effigia, Sillosuchus (Nesbitt 2007); Poposaurus (Weinbaum and Hungerbühler 2007)], as well as the peculiar sail-backed forms [Arizonasaurus (Weinbaum and Hungerbühler 2007); Hypselorhachis )], although without a clear pattern of distribution (Fig. 10).…”

Section: Hyposphene-hypantrum Articulation In Dorsal Vertebraementioning

confidence: 97%

“…In the last 20 years rauisuchian archosaurs have therefore been in the focus of extensive research, mainly because of the discovery of new taxa and specimens (Gower 1999;Sulej 2005;Nesbitt 2005Nesbitt , 2007Gower and Schoch 2009;Desojo and Arcucci 2009;Trotteyn et al 2011), but also because of the revision of known and historical material (Alcober 2000;Weinbaum and Hungerbühler 2007;Lautenschlager 2008). The latter is an especially important factor for the understanding of Rauisuchia and their evolution-however, many taxa collected during the first half of the last century (and before the application of numerical phylogenetic analyses) remain scientifically neglected.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Reassessment of the Middle Triassic rauisuchian archosaurs Ticinosuchus ferox and Stagonosuchus nyassicus

Lautenschlager

Desojo

2011

Paläontol. Z.

View full text Add to dashboard Cite

The Middle Triassic (Anisian) rauisuchian archosaurs Ticinosuchus ferox and Stagonosuchus nyassicus are two of the earliest representatives of this group and therefore of special importance for our understanding of the evolution and early diversification of Rauisuchia. Both taxa are well preserved and, in the case of the holotype of Ticinosuchus ferox, nearly complete and articulated. However, the original descriptions and recent revisions of the material do not sufficiently cover all aspects of their osteology. We identify new skull elements previously unknown for Ticinosuchus ferox and present new reconstructions of the pectoral and pelvic girdle elements. Vertebral laminae and fossae are described for the first time in both Ticinosuchus ferox and Stagonosuchus nyassicus. Newly recognised character states of Stagonosuchus nyassicus include the presence of additional infraprezygapophyseal and infrapostzygapophyseal laminae in the cervical vertebrae, a hyposphene-hypantrum articulation in the dorsal vertebrae and a fibula with a posteromedial depression. Furthermore, we provide a revised and emended diagnosis for both taxa, including several autapomorphies for Stagonosuchus nyassicus (e.g. a boss-like protuberance on the postacetabular process of the iliac blade and a marked short dorsolateral crest on the proximal ischium). We review the taxonomic status of a further specimen of Ticinosuchus ferox, as well as material related to Stagonosuchus nyassicus from the Manda Beds of Tanzania. Additionally, we discuss the distribution and possible function of rauisuchian characters, such as accessory neural spines in the caudal vertebrae, in these and other rauisuchian taxa.Kurzfassung Aufgrund ihres stratigraphischen Alters sind die beiden Rauisuchier Ticinosuchus ferox und Stagonosuchus nyassicus aus der Mittleren Trias (Anisium) für das Verständnis der Evolution und frühen Diversifikation der Rauisuchier von besonderer Bedeutung. Obwohl beide Taxa gut erhalten sind, und der Holotyp von Ticinosuchus ferox fast vollständig und artikuliert ist, weisen sowohl die Erstbeschreibungen, als auch neuere Bearbeitungen, Lücken auf. Wir beschreiben bisher unbekannte Schädelelemente von Ticinosuchus ferox und präsentieren neue Rekonstruktionen des Schulter-und Beckengürtels. Erstmals beschreiben wir detailliert die Lamina und Fossa der Hals-und Rückenwirbel beider Taxa, sowie neu identifizierte Merkmalen von Stagonosuchus nyassicus. Dazu zählen: Zusätzliche infraprezygapophyseale und infrapostzygapophyseale Lamina in den Halswirbeln, Hyposphen-Hypantrum-Gelenkungen in den Rückenwirbeln und eine charakteristische posteromediale Vertiefung in der Fibula. Desweiteren präsentieren wir eine erweiterte und

show abstract

Section: Caudal Osteodermmentioning

confidence: 92%

Section: Cervical Vertebraementioning

confidence: 95%

Section: Pectoral Girdlementioning

confidence: 97%

Section: Hyposphene-hypantrum Articulation In Dorsal Vertebraementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reassessment of the Middle Triassic rauisuchian archosaurs Ticinosuchus ferox and Stagonosuchus nyassicus

Lautenschlager

Desojo

2011

Paläontol. Z.

View full text Add to dashboard Cite

show abstract

Functional morphology of the Triassic apex predator Saurosuchus galilei (Pseudosuchia: Loricata) and convergence with a post‐Triassic theropod dinosaur

Fawcett

Lautenschlager

Bestwick

et al. 2023

The Anatomical Record

View full text Add to dashboard Cite

Pseudosuchian archosaurs, reptiles more closely related to crocodylians than to birds, exhibited high morphological diversity during the Triassic and are thus associated with hypotheses of high ecological diversity during this time. One example involves basal loricatans which are non‐crocodylomorph pseudosuchians traditionally known as “rauisuchians.” Their large size (5–8+ m long) and morphological similarities to post‐Triassic theropod dinosaurs, including dorsoventrally deep skulls and serrated dentitions, suggest basal loricatans were apex predators. However, this hypothesis does not consider functional behaviors that can influence more refined roles of predators in their environment, for example, degree of carcass utilization. Here, we apply finite element analysis to a juvenile but three‐dimensionally well‐preserved cranium of the basal loricatan Saurosuchus galilei to investigate its functional morphology and to compare with stress distributions from the theropod Allosaurus fragilis to assess degrees of functional convergence between Triassic and post‐Triassic carnivores. We find similar stress distributions and magnitudes between the two study taxa under the same functional simulations, indicating that Saurosuchus had a somewhat strong skull and thus exhibited some degree of functional convergence with theropods. However, Saurosuchus also had a weak bite for an animal of its size (1015–1885 N) that is broadly equivalent to the bite force of modern gharials (Gavialis gangeticus). We infer that Saurosuchus potentially avoided tooth–bone interactions and consumed the softer parts of carcasses, unlike theropods and other basal loricatans. This deduced feeding mode for Saurosuchus increases the known functional diversity of basal loricatans and highlights functional differences between Triassic and post‐Triassic apex predators.

show abstract

Paleoneurology and neuroanatomical notes on the South American “rauisuchian” Saurosuchus galilei from the Ischigualasto formation, San Juan, Argentina

von Baczko,

Cardillo,

Ulloa‐Guaiquin

et al. 2023

The Anatomical Record

Self Cite

View full text Add to dashboard Cite

Non‐crocodylomorph loricatans, traditionally known as “rauisuchians,” are considered as the top predators of the Triassic continental faunas that reigned before the emergence of the well‐known theropod dinosaurs. In particular, Saurosuchus galilei is a large quadrupedal prestosuchid loricatan found in the Ischigualasto Formation from northwestern Argentina. Here, we reevaluated the braincase of S. galilei and present the first paleoneurological study based on the partial natural casts of the holotype and the digital cranial endocast of the referred specimen PVSJ 32. The braincase of S. galilei was here reinterpreted, identifying the sutures of the supraoccipital, otoccipital, basioccipital, parabasisphenoid, prootic, and laterosphenoid. A unique feature identified in the braincase of S. galilei is the presence of deep paracondylar recesses associated with pharyngotympanic pneumaticity, which has not been identified in any other “rauisuchians” so far. Most of the structures of the encephalon were recognized in the cranial endocast and natural casts including cranial nerves V–XII, olfactory bulbs, main blood vessels and sinuses, and inner ear. These structures allowed us to quantify some of its sensorial capacities and recognize that S. galilei had an enhanced olfactory acuity, with coefficients higher than those expected for its body size, a condition previously observed in living crocodilians and tyrannosaurid dinosaurs. An improved sense of smell might have allowed Saurosuchus to track its prey from long distances and compensate for the poorer development of its other senses like vision and balance.

show abstract

Nuevo Material Postcraneano deSaurosuchus galileiReig (Archosauria: Crurotarsi) del Triásico Superior del Centro-Oeste de Argentina

Cited by 41 publications

References 33 publications

Reassessment of the Middle Triassic rauisuchian archosaurs Ticinosuchus ferox and Stagonosuchus nyassicus

Reassessment of the Middle Triassic rauisuchian archosaurs Ticinosuchus ferox and Stagonosuchus nyassicus

Functional morphology of the Triassic apex predator Saurosuchus galilei (Pseudosuchia: Loricata) and convergence with a post‐Triassic theropod dinosaur

Paleoneurology and neuroanatomical notes on the South American “rauisuchian” Saurosuchus galilei from the Ischigualasto formation, San Juan, Argentina

Contact Info

Product

Resources

About