Mystriosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic (Toarcian). Fossil specimens have been found in the Whitby Mudstone of England and Posidonia Shale of Germany. The only known species, M. laurillardi, exceeded 4 metres (13 ft) in length.[1]

Temporal range: Early Jurassic Toarcian
Mystriosaurus assigned specimen.jpg
Assigned specimen (holotype of the junior synonym Steneosaurus brevior)
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Pseudosuchia
Superorder: Crocodylomorpha
Suborder: Thalattosuchia
Family: Teleosauridae
Genus: Mystriosaurus
Kaup, 1834
M. laurillardi
Binomial name
Mystriosaurus laurillardi
Kaup, 1834

"Steneosaurus" brevior Blake, 1876

  • Engyommasaurus Kaup, 1834
Holotype skull

A 2019 phylogenetic analysis found Mystriosaurus to be distinct from Steneosaurus.[2]

See alsoEdit


  1. ^ "Sachs_Mystiosaurus". Sachs. Retrieved 2011-09-12.
  2. ^ Sachs, S.; Johnson, M.M.; Young, M.T.; Abel, P. (2019). "The mystery of Mystriosaurus: Redescribing the poorly known Early Jurassic teleosauroid thalattosuchians Mystriosaurus laurillardi and Steneosaurus brevior" (PDF). Acta Palaeontologica Polonica. 64 (3): 565–579. doi:10.4202/app.00557.2018.