Leurospondylus

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Leurospondylus
Temporal range: Late Cretaceous
Leurospondylus.jpg
Dorsal view of the spine of Leurospondylus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Sauropterygia
Order: Plesiosauria
Suborder: Plesiosauroidea
Family: unknown
Genus: Leurospondylus
Species

Leurospondylus is a genus of plesiosaur whose family is not known for certain, but is thought to be Plesiosauridae.

Etymology[edit]

The name Leurospondylus comes from a fusion of two Greek words, leuros (λευρός) meaning "even", "flat" or "smooth", and spondylos (σπόνδυλος) meaning "vertebra."[1] The name of the type species L. ultimus comes from the Latin ultimus meaning "last." It was so named because this genus was the latest known occurrence of a fossil plesiosaur when it was described in 1913."[1]

Description[edit]

The first described Leurospondylus was a juvenile.[2] It was found with 12 vertebrae but is thought to have had twice that number,[2] and was estimated to be roughly seven feet long as a juvenile.[2] Samuel Paul Welles noted that the vertebrae are short and similar to those of pliosaurs,[3] while the scapulae and coracoids bear resemblance to those of elasmosaurids,[3] thus making it difficult to determine to which family it belongs.[3] There is some speculation that the Leurospondylus specimen is either a juvenile of a known species, or in its own, unrecognized taxonomic group.[1]

Distribution[edit]

The first Leurospondylus was found in the brackish paleoenvironment represented by the Edmonton beds located on the present-day Red Deer River. This area is part of the Horseshoe Canyon Formation in Alberta, Canada.[1] The occurrence of this juvenile fossil in an identifiably brackish environment led to the conclusion that plesiosaurs spent their early lives in rivers and estuaries.[1] However, some plesiosaurs spent their adult lives in fresh water also; whether Leurospondylus grew up and then left, or grew up and stayed in a fresh water ecosystem has not been determined.[1]

References[edit]

  1. ^ a b c d e f "ppne.co.uk entry on Leurospondylus". Retrieved 2008-05-20. 
  2. ^ a b c A new plesiosaur, Leurospondylus, from the Edmonton Cretaceous of Alberta. Bulletin of the AMNH ; v. 32, article 40.
  3. ^ a b c Welles, S. P. 1962. A new species of elasmosaur from the Aptian of Columbia and a review of the Cretaceous plesiosaurs. University of California Publications in Geological Science 46, 96 pp.

External links[edit]