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A new prozostrodontian cynodont (Therapsida) from the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil.
An Acad Bras Cienc. 2014 Dec; 86(4):1673-92.AA

Abstract

We report here on a new prozostrodontian cynodont, Botucaraitherium belarminoi gen. et sp. nov., from the Late Triassic Riograndia Assemblage Zone (AZ) of the Candelária Sequence (Santa Maria Supersequence), collected in the Botucaraí Hill Site, Candelária Municipality, state of Rio Grande do Sul, Brazil. The new taxon is based on a single specimen (holotype MMACR-PV-003-T) which includes the left lower jaw, without postdentary bones, bearing the root of the last incisor, canine and four postcanines plus one partial crown inside the dentary, not erupted, and two maxillary fragments, one with a broken canine and another with one postcanine. The features of the lower jaw and lower/upper postcanines resemble those of the prozostrodontians Prozostrodon brasiliensis from the older Hyperodapedon AZ and Brasilodon quadrangularis and Brasilitherium riograndensis from the same Riograndia AZ. The inclusion of Botucaraitherium within a broad phylogenetic analysis, positioned it as a more derived taxon than tritylodontids, being the sister-taxon of Brasilodon, Brasilitherium plus Mammaliaformes. Although the new taxon is based on few cranial elements, it represents a additional faunal component of the Triassic Riograndia AZ of southern Brazil, in which small-sized derived non-mammaliaform cynodonts, closely related to the origin of mammaliaforms, were ecologically well succeed and taxonomically diverse.

Authors+Show Affiliations

Laboratório do Setor de Paleovertebrados, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul/UFRGS, Porto Alegre, RS, Brasil.Laboratório do Setor de Paleovertebrados, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul/UFRGS, Porto Alegre, RS, Brasil.Museu de Zoologia, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana/UEFS, Feira de Santana, BA, Brasil.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25590707

Citation

Soares, Marina B., et al. "A New Prozostrodontian Cynodont (Therapsida) From the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil." Anais Da Academia Brasileira De Ciencias, vol. 86, no. 4, 2014, pp. 1673-92.
Soares MB, Martinelli AG, De Oliveira TV. A new prozostrodontian cynodont (Therapsida) from the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil. An Acad Bras Cienc. 2014;86(4):1673-92.
Soares, M. B., Martinelli, A. G., & De Oliveira, T. V. (2014). A new prozostrodontian cynodont (Therapsida) from the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil. Anais Da Academia Brasileira De Ciencias, 86(4), 1673-92. https://doi.org/10.1590/0001-3765201420140455
Soares MB, Martinelli AG, De Oliveira TV. A New Prozostrodontian Cynodont (Therapsida) From the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil. An Acad Bras Cienc. 2014;86(4):1673-92. PubMed PMID: 25590707.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new prozostrodontian cynodont (Therapsida) from the Late Triassic Riograndia Assemblage Zone (Santa Maria Supersequence) of Southern Brazil. AU - Soares,Marina B, AU - Martinelli,Agustín G, AU - De Oliveira,Téo V, Y1 - 2014/11/28/ PY - 2014/09/08/received PY - 2014/10/14/accepted PY - 2015/1/16/entrez PY - 2015/1/16/pubmed PY - 2015/6/16/medline SP - 1673 EP - 92 JF - Anais da Academia Brasileira de Ciencias JO - An Acad Bras Cienc VL - 86 IS - 4 N2 - We report here on a new prozostrodontian cynodont, Botucaraitherium belarminoi gen. et sp. nov., from the Late Triassic Riograndia Assemblage Zone (AZ) of the Candelária Sequence (Santa Maria Supersequence), collected in the Botucaraí Hill Site, Candelária Municipality, state of Rio Grande do Sul, Brazil. The new taxon is based on a single specimen (holotype MMACR-PV-003-T) which includes the left lower jaw, without postdentary bones, bearing the root of the last incisor, canine and four postcanines plus one partial crown inside the dentary, not erupted, and two maxillary fragments, one with a broken canine and another with one postcanine. The features of the lower jaw and lower/upper postcanines resemble those of the prozostrodontians Prozostrodon brasiliensis from the older Hyperodapedon AZ and Brasilodon quadrangularis and Brasilitherium riograndensis from the same Riograndia AZ. The inclusion of Botucaraitherium within a broad phylogenetic analysis, positioned it as a more derived taxon than tritylodontids, being the sister-taxon of Brasilodon, Brasilitherium plus Mammaliaformes. Although the new taxon is based on few cranial elements, it represents a additional faunal component of the Triassic Riograndia AZ of southern Brazil, in which small-sized derived non-mammaliaform cynodonts, closely related to the origin of mammaliaforms, were ecologically well succeed and taxonomically diverse. SN - 1678-2690 UR - https://www.unboundmedicine.com/medline/citation/25590707/A_new_prozostrodontian_cynodont__Therapsida__from_the_Late_Triassic_Riograndia_Assemblage_Zone__Santa_Maria_Supersequence__of_Southern_Brazil_ DB - PRIME DP - Unbound Medicine ER -