Paleoneurology and neuroanatomical notes on the South American “rauisuchian” Saurosuchus galilei from the Ischigualasto formation, San Juan, Argentina DOI
M. Belén von Baczko,

Ariel F. Cardillo,

Karen S. Ulloa-Guaiquin

et al.

The Anatomical Record, Journal Year: 2023, Volume and Issue: 307(4), P. 1239 - 1253

Published: Dec. 22, 2023

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

Language: Английский

Assessing the adductor musculature and jaw mechanics of Proterochampsa nodosa (Archosauriformes: Proterochampsidae) through finite element analysis DOI
Daniel de Simão‐Oliveira, Tiago dos Santos, Felipe L. Pinheiro

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 307(4), P. 1300 - 1314

Published: Jan. 19, 2024

Abstract Proterochampsids are a group of South American nonarchosaurian archosauromorphs whose general morphology has been historically likened to that the extant Crocodylia, which purportedly exhibited similar habits by convergence. Taxa from genus Proterochampsa , for example, show platyrostral skulls with dorsally faced orbits and external nares elongated snouts might indicate feeding habit crocodilians. Nonetheless, some aspects their craniomandibular anatomy distinct. comparatively larger skull temporal fenestrae, unique mandibular adductor chamber, remarkably large surangular shelf fainter retroarticular region in mandible. In light this, we conducted biomechanical tests on 3‐dimensional model nodosa including first Finite Element Analysis proterochampsians compared it models crocodylians Tomistoma schlegelii Alligator mississippiensis . Our analyses suggested that, despite differences was able perform bite forces comparable those modeled significantly higher than However, chamber renders more prone accumulate stresses resulting muscle contraction, when both analogs. The lower jaw like is susceptible bending, As result, suggest employ anteriorly directed bites only handling small soft‐bodied prey. addition, exemplifies diversity arrangements musculature adopted different diverging archosauromorph groups.

Language: Английский

Citations

3
Paleoneurology and neuroanatomical notes on the South American “rauisuchian” Saurosuchus galilei from the Ischigualasto formation, San Juan, Argentina DOI
M. Belén von Baczko,

Ariel F. Cardillo,

Karen S. Ulloa-Guaiquin

et al.

The Anatomical Record, Journal Year: 2023, Volume and Issue: 307(4), P. 1239 - 1253

Published: Dec. 22, 2023

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

Language: Английский

Citations

4