Prozostrodon brasiliensis, a probainognathian cynodont from the Late Triassic of Brazil: second record and improvements on its dental anatomy
| Autor: | Ane Elise Branco Pavanatto, Marina Bento Soares, Agustín G. Martinelli, Cristian Pereira Pacheco, Sérgio Dias-da-Silva |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
010506 paleontology biology Dentition Dental anatomy Holotype Prozostrodon Hyperodapedon CYNODONTIA HYPERODAPEDON AZ LOWER JAW Prozostrodontia Anatomy biology.organism_classification 010603 evolutionary biology 01 natural sciences Paleontología Ciencias de la Tierra y relacionadas con el Medio Ambiente Cynodont Paleontology PROZOSTRODONTIA General Agricultural and Biological Sciences Cingulum (tooth) CIENCIAS NATURALES Y EXACTAS 0105 earth and related environmental sciences |
| DOI: | 10.6084/m9.figshare.6073340 |
| Popis: | Probainognathian cynodonts are conspicuous elements of the Assemblage Zones of the Triassic Santa Maria Supersequence in southern Brazil. Within this group, the derived clade Prozostrodontia, in which the crown group Mammalia is included, is taxonomic diverse in the Hyperodapedon and Riograndia AZs. We describe here the second known specimen (CAPPA/UFSM 0123) of Prozostrodon brasiliensis, until now only represented by its holotype. CAPPA/UFSM 0123 includes a right dentary with dentition. As in the holotype of P. brasiliensis, it has four lower incisors, pc4 with conspicuous cusp a, and small cusps b, c, and d, pc5-pc6 of ‘triconodont’ type with cusps a > c > b > d, with continuous lingual cingulum bearing up to six small discrete cusps, length of the lower tooth row more than half the length of the dentary, and relatively deep horizontal ramus of the dentary. The new specimen is about 25% smaller than the holotype and there is not a diastema between the canine and postcanine teeth, indicating its juvenile condition. Based on both known specimens of P. brasiliensis, a discussion on tooth replacement is presented, showing that the adult individual has more postcanine tooth morphotypes than the juvenile one. Fil: Pacheco, Cristian P.. Universidade Federal de Santa Maria; Brasil Fil: Martinelli, Agustín Guillermo. Universidade Federal do Rio Grande do Sul; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Pavanatto, Ane E. B.. Universidade Federal de Santa Maria; Brasil Fil: Soares, Marina B.. Universidade Federal do Rio Grande do Sul; Brasil Fil: Dias-da-Silva, Sérgio. Universidade Federal de Santa Maria; Brasil |
| Databáze: | OpenAIRE |
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