Lexovisaurus (Lexovii lizard)
Lexovisaurus (Lexovii lizard)
Named By : Robert Hoffstetter - 1957
Diet : Herbivore
Size : Estimated 6 meters long
Type of Dinosaur : /
Type Species : L. durobrivensis (type)
Found in : England - Oxford Clay Formation. Possibly France and Germany
When it Lived : Middle – Late Jurassic, 165.7–164.7 million years ago
Lexovisaurus, a genus stegosaur, is from the mid-to-Late Jurassic Europe (165.7-164.7 mya). Fossils of limb bones, armor fragments and other fossils were found in the middle-to-late Jurassic-aged strata in England and France.
Alfred Nicholson Leeds, a collector, acquired a skeleton from a dinosaur excavated in a small pit at Tanholt, near Eye, Cambridgeshire, in the early 1880s. The remains were presented to Henry Woodward, a paleontologist who created the first documentation about the subject in September 1885. Later, it was incorrectly assumed that the find was made at Fletton’s industrial brick pits. This is where Leeds usually finds its specimens. John Whitaker Hulke described the fossil in 1887 and called it Omosaurus durobrivensis, a new species. This name was used to refer to the ancient Roman city of Durobrivae. The British Museum of Natural History purchased the specimen on 30 May 1892.
The holotype, BMNH R1989 was found in the Peterborough Member, Oxford Clay Formation. It is more notable for the Kosmoceras Jason biozone, which dates from the middle Callovian. Hulke misunderstoodly assumed that the Kimmeridge Clay Formation was the source. It is composed of a sacrum, five vertebrae and two ilia. The species was also referred to by two plates, which were thought to be part the dermal armor. Othniel Marsh, who visited Leeds’ Eyebury collection on 22 August 1888, recognized the elements as belonging to a huge fish named Leedsichthys in 1889 by Arthur Smith Woodward. These plates actually form part of the skull roof.
Omosaurus durobrivensis in 1915 was renamed Dacentrurus derobrivensis because the name Omosaurus had previously been preoccupied by Marsh in 1870s. Robert Hoffstetter, a French paleontologist, created a separate species genus in 1957. The Lexovisaurus is the generic name. It derives its name from the Lexovii, a Gallic tribe that lived in Normandy in ancient times. Hoffstetter had discovered several stegosaurian specimens and referred them to Lexovisaurus. Omosaurus durobrivensis remains the type species, but the combinatio Nova is Lexovisaurus. Hofstetter also referred to a more complete stegosaurian skeleton that was discovered in 1901 by Leeds in Fletton brickpit, specimen BMNHR3167. This specimen had previously been called Stegosaurus priscus in 1911. Oskar Kuhn, who referred to the nomen nudum Omosaurus Leedsi in 1964 (seeley vide Huene 2001 to Lexovisaurus als Lexovisaurus leedsi). Peter Galton changed the name of Omosaurus vetustus Huene 1911 into Lexovisaurus vetustus in 1983.
Susannah Maidment and her colleagues determined that Lexovisaurus’ holotype, BMNH R1989 was not diagnostic. They therefore split BMNH R3167 from the French finds and named them Loricatosaurus. Lexovisaurus was made a nomen dubium, O. vetustus became a nomen dubium. However, Lexovisaurus was accepted by other workers who combined the English material collected at Leeds because of its shared provenance. Omosaurus vetustus was renamed Eoplophysis in the interim, though this genus isn’t considered valid. Maidment and co. mistakenly consider the nomen nudum Omosaurus leedsi to be a nomen Dubium. 2008) has been referred to Loricatosaurus.