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First 'Rauisuchian' archosaur (Pseudosuchia, Loricata) for the Middle Triassic Santacruzodon assemblage zone (Santa Maria Supersequence), Rio Grande do Sul State, Brazil.

Lacerda MB, Schultz CL, Bertoni-Machado C - PLoS ONE (2015)

Bottom Line: In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul State, specifically in the Middle Triassic Dinodontosaurus assemblage zone (AZ) and the Late Triassic Hyperodapedon AZ (Rauisuchus tiradentes).Between these two cenozones is the Santacruzodon AZ (Middle Triassic), whose record was, until now, restricted to non-mammalian cynodonts and the proterochampsian Chanaresuchus bonapartei.Here we present the first occurrence of a rauisuchian archosaur for this cenozone, from the Schoenstatt outcrop, located near the city of Santa Cruz do Sul and propose a new species, based on biostratigraphical evidence and a comparative osteological analysis.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Geociências, Laboratório de Paleovertebrados, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

ABSTRACT
The 'Rauisuchia' are a group of Triassic pseudosuchian archosaurs that displayed a near worldwide distribution. In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul State, specifically in the Middle Triassic Dinodontosaurus assemblage zone (AZ) and the Late Triassic Hyperodapedon AZ (Rauisuchus tiradentes). Between these two cenozones is the Santacruzodon AZ (Middle Triassic), whose record was, until now, restricted to non-mammalian cynodonts and the proterochampsian Chanaresuchus bonapartei. Here we present the first occurrence of a rauisuchian archosaur for this cenozone, from the Schoenstatt outcrop, located near the city of Santa Cruz do Sul and propose a new species, based on biostratigraphical evidence and a comparative osteological analysis.

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(A) Composite illustration of the left ilium with thee better preserved right ischium in articulation; (B) illustration of the ilium in medial view; (C) cross-section of the ilium in posterior view; (D) cross-section of the ischium in distal view.Abbreviations: as Fig. 2 plus: asr 1, articulation site for the sacral rib of the first sacral vertebra; asr 2, articulation site for the sacral rib of the second sacral vertebra. Damaged areas in grey.
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pone.0118563.g005: (A) Composite illustration of the left ilium with thee better preserved right ischium in articulation; (B) illustration of the ilium in medial view; (C) cross-section of the ilium in posterior view; (D) cross-section of the ischium in distal view.Abbreviations: as Fig. 2 plus: asr 1, articulation site for the sacral rib of the first sacral vertebra; asr 2, articulation site for the sacral rib of the second sacral vertebra. Damaged areas in grey.

Mentions: Additional diagnostic features would be the articulation sites for only two sacral vertebrae (Fig. 5), a condition that is described for Prestosuchus chiniquensis [24, 37], Saurosuchus galilei [34] and Decuriasuchus quartacolonia [14] but not for Batrachotomus kupferzellensis, which has 3 [13].


First 'Rauisuchian' archosaur (Pseudosuchia, Loricata) for the Middle Triassic Santacruzodon assemblage zone (Santa Maria Supersequence), Rio Grande do Sul State, Brazil.

Lacerda MB, Schultz CL, Bertoni-Machado C - PLoS ONE (2015)

(A) Composite illustration of the left ilium with thee better preserved right ischium in articulation; (B) illustration of the ilium in medial view; (C) cross-section of the ilium in posterior view; (D) cross-section of the ischium in distal view.Abbreviations: as Fig. 2 plus: asr 1, articulation site for the sacral rib of the first sacral vertebra; asr 2, articulation site for the sacral rib of the second sacral vertebra. Damaged areas in grey.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4340915&req=5

pone.0118563.g005: (A) Composite illustration of the left ilium with thee better preserved right ischium in articulation; (B) illustration of the ilium in medial view; (C) cross-section of the ilium in posterior view; (D) cross-section of the ischium in distal view.Abbreviations: as Fig. 2 plus: asr 1, articulation site for the sacral rib of the first sacral vertebra; asr 2, articulation site for the sacral rib of the second sacral vertebra. Damaged areas in grey.
Mentions: Additional diagnostic features would be the articulation sites for only two sacral vertebrae (Fig. 5), a condition that is described for Prestosuchus chiniquensis [24, 37], Saurosuchus galilei [34] and Decuriasuchus quartacolonia [14] but not for Batrachotomus kupferzellensis, which has 3 [13].

Bottom Line: In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul State, specifically in the Middle Triassic Dinodontosaurus assemblage zone (AZ) and the Late Triassic Hyperodapedon AZ (Rauisuchus tiradentes).Between these two cenozones is the Santacruzodon AZ (Middle Triassic), whose record was, until now, restricted to non-mammalian cynodonts and the proterochampsian Chanaresuchus bonapartei.Here we present the first occurrence of a rauisuchian archosaur for this cenozone, from the Schoenstatt outcrop, located near the city of Santa Cruz do Sul and propose a new species, based on biostratigraphical evidence and a comparative osteological analysis.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Geociências, Laboratório de Paleovertebrados, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

ABSTRACT
The 'Rauisuchia' are a group of Triassic pseudosuchian archosaurs that displayed a near worldwide distribution. In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul State, specifically in the Middle Triassic Dinodontosaurus assemblage zone (AZ) and the Late Triassic Hyperodapedon AZ (Rauisuchus tiradentes). Between these two cenozones is the Santacruzodon AZ (Middle Triassic), whose record was, until now, restricted to non-mammalian cynodonts and the proterochampsian Chanaresuchus bonapartei. Here we present the first occurrence of a rauisuchian archosaur for this cenozone, from the Schoenstatt outcrop, located near the city of Santa Cruz do Sul and propose a new species, based on biostratigraphical evidence and a comparative osteological analysis.

Show MeSH