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Revista Brasileira de Paleontologia
Article . 2022 . Peer-reviewed
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Novas evidências de possíveis Unenlagiinae (Deinonychosauria, Theropoda) na Bacia São Luís-Grajaú, Albiano–Cenomaniano do Estado do Maranhão, Brasil

Authors: Luiz Antonio Letizio; Reinaldo J. Bertini; Manuel Alfredo Medeiros;

Novas evidências de possíveis Unenlagiinae (Deinonychosauria, Theropoda) na Bacia São Luís-Grajaú, Albiano–Cenomaniano do Estado do Maranhão, Brasil

Abstract

New evidence of putative Unenlagiinae (Deinonychosauria, Theropoda) in the São Luís-Grajaú Basin, Albian–Cenomanian, State of Maranhão, Brazil. We studied an assemblage of teeth from Laje do Coringa, São Luís-Grajaú Basin, Alcântara Formation, State of Maranhão, Brazil. The collection sites are dated as Albian–Cenomanian. Ten teeth were submitted to morphological analysis in Scanning Electron Microscopy, with the goal of identifying materials likely associated with unenlagiine theropod dinosaurs. Three specimens were identified as putative members of the group based on: (a) strong labial-lingual flattening of the crown, (b) absence of longitudinal grooves, (c) dimensions compatible with previously described Unenlagiinae, (d) “ziphodont” morphology lightly to the mesial portion, (e) basal section with two distinguishable borders, (f) complete absence of serrations. These teeth expand chronological and geographical distributions of Unenlagiinae dinosaurs. Keywords: Dinosauria, teeth, Maniraptoriformes, Cretaceous. RESUMO – O presente trabalho investiga uma associação de dentes isolados provenientes da Laje do Coringa, Bacia São Luís-Grajaú, Formação Alcântara, Estado do Maranhão, Brasil. Os locais de coleta são datados para os andares Albiano–Cenomaniano do Período Cretáceo. Dez dentes foram submetidos a análises morfológicas em Microscopia Eletrônica de Varredura, com objetivo de identificar materiais possivelmente associáveis a dinossauros terópodos unenlagiinos. Três espécimes foram identificados como possivelmente associáveis ao grupo, com base em (a) forte achatamento lábio-lingual da coroa, (b) ausência de estrias longitudinais, (c) dimensões totais dos espécimes compatíveis com as equivalentes de Unenlagiinae previamente descritos, (d) forma “zifodonte” levemente voltada para a porção mesial, (e) forma da seção basal com duas bordas distinguíveis, (f) ausência completa de serrilhas. Estes dentes ampliam distribuições cronológicas e geográficas de dinossauros Unenlagiinae. Palavras-chave: Dinosauria, dentes, Maniraptoriformes, Cretáceo.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Top 10%
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