Journal article

Description and phylogenetic relationships of a new species of Torvoneustes (Crocodylomorpha, Thalattosuchia) from the Kimmeridgian of Switzerland


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  • 19.07.2023
Published in:
  • PeerJ. - PeerJ. - 2023, vol. 11, p. 1-57
English Metriorhynchids are marine crocodylomorphs found across Jurassic and Lower
Cretaceous deposits of Europe and Central and South America. Despite being one of
the oldest fossil families named in paleontology, the phylogenetic relationships
within Metriorhynchidae have been subject to many revisions over the past 15 years.
Herein, we describe a new metriorhynchid from the Kimmeridgian of Porrentruy,
Switzerland. The material consists of a relatively complete, disarticulated skeleton
preserving pieces of the skull, including the frontal, prefrontals, right postorbital,
nasals, maxillae, right premaxillae and nearly the entire mandible, and many remains
of the axial and appendicular skeleton such as cervical, dorsal, and caudal vertebrae,
ribs, the left ischium, the right femur, and the right fibula. This new specimen is
referred to the new species Torvoneustes jurensis sp. nov. as part of the large-bodied
macrophagous tribe Geosaurini. Torvoneustes jurensis presents a unique
combination of cranial and dental characters including a smooth cranium, a unique
frontal shape, acute ziphodont teeth, an enamel ornamentation made of numerous
apicobasal ridges shifting to small ridges forming an anastomosed pattern toward the
apex of the crown and an enamel ornamentation touching the carina.
The description of this new species allows to take a new look at the currently
proposed evolutionary trends within the genus Torvoneustes and provides new
information on the evolution of this clade.
Faculté des sciences et de médecine
Département de Géosciences
  • English
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