Seldsienean

Seldsienean (Old English for "seldom seen one") in an extinct genus of machimosaurid thalattosuchian from the Middle Jurassic of England and France.

[1] It is known from the Calcaire de Caen and the Cornbrash Formation.

[1] Its type species, S. megistorhynchus, was originally described as a species of Steneosaurus in 1866,[2] but was given its own genus in 2020.

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Alternative view of the holotype