New data on Cretaceous freshwater hybodont sharks from Guangxi Province, South China

Gilles Cuny 1 Jinyou Mo Romain Amiot 1 Eric Buffetaut Suravech Suteethorn Varavudh Suteethorn Haiyan Tong
1 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]
Abstract : The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited in a non-marine, fluvial environment, has yielded a diverse assemblage of vertebrates. The study of the shark teeth from the Xinlong Formation revealed the presence of teeth of Acrorhizodus khoratensis that do not appear to correspond to a jaw position retrieved in Thailand. It also provides a new understanding of the systematic affinities of the species \textquotedblleftHybodus\textquotedblright aequitridentatus. The latter does not belong to te genus Hybodus but to a new genus belonging to the family Thaiodontidae. The material found in the Xinlong Formation also questions our understanding of the heterodonty pattern of the genus Acrorhizodus and highlights how peculiar this genus is among Hybodontiformes. As only two teeth differ significantly from the material retrieved in Thailand, it is difficult to assess whether the Chinese material includes a species different from the Thai one, but it certainly calls for a careful reappraisal of all the available material to better assess the heterodonty pattern of this genus.
Keywords : Cretaceous Hybodont sharks freshwater endemism Asia
Document type :
Journal articles
Complete list of metadatas
https://hal-univ-lyon1.archives-ouvertes.fr/hal-02328792
Contributor : Depot 2 Lyon 1 <>
Submitted on : Wednesday, October 23, 2019 - 12:36:12 PM
Last modification on : Tuesday, November 19, 2019 - 2:40:40 AM

Identifiers

Collections

UNIV-LYON1 | ENS-LYON | CNRS | INSU | LGL-TPE | UDL

Citation

Gilles Cuny, Jinyou Mo, Romain Amiot, Eric Buffetaut, Suravech Suteethorn, et al.. New data on Cretaceous freshwater hybodont sharks from Guangxi Province, South China. Research & Knowledge, 2017, 3 (1), pp.11--15. ⟨10.14456/randk.2017.4⟩. ⟨hal-02328792⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

10

Contact

Informations

CCSD