Microcleidus

Microcleidus Temporal range: Toarcian ~
Fossil M. homalospondylus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	†Sauropterygia
Order:	†Plesiosauria
Family:	†Microcleididae
Genus:	†Microcleidus Watson, 1909
Type species
Plesiosaurus homalospondylus (Owen, 1865)
Other species
M. macropterus (Seeley, 1865) M. tournemirensis (Sciau et al., 1990) M. melusinae Vincent et al., 2019
Synonyms
M. macropteus Plesiosaurus macropteus Seeley, 1865 M. tournemirensis Plesiosaurus tournemirensis Sciau et al., 1990 Occitanosaurus tournemirensis Bardet et al., 1999

Microcleidus is an extinct genus of sauropterygian reptile belonging to the Plesiosauroidea. It was about the size of a medium-sized dolphin, reaching a length of 3 metres (9.8 ft). The species has 40 neck vertebrae and a short tail of 28 vertebrae. Fossils of the genus have been found in France, the Posidonia Shale in Germany and Luxembourg, and the Alum Shale Formation of England.

Classification

Restoration

Fossil M. homalospondylus

Fossils of Microcleidus tournemirensis

Species include: Microcleidus homalospondylus (Owen 1865) and Microcleidus macropterus (Seeley 1865).

Occitanosaurus tournemirensis (originally "Plesiosaurus" tournemirensis), was named by Sciau et al. in 1990, based on a nearly complete skeleton of an animal approximately 4 meters (13 ft) long. It was later found to be a species of Microcleidus.

The following cladogram follows an analysis by Ketchum & Benson, 2011.

See also

• List of plesiosaur genera
• Timeline of plesiosaur research

References

Bibliography

• Bardet, Nathalie; Fernandez, Marta; Garcia-Ramos, Jose Carlos; Superbiola, Xabier Pereda; Pinuela, Laura; Ruiz-Omenaca, Jose Ignacio; and Vincent, Peggy (2008). "A juvenile plesiosaur from the Pliensbackian (Lower Jurassic) of Asturias, Spain". Journal of Vertebrate Paleontology 28(1): 258–263
• [1] Plesiosaur.com 13 Oct 2006
• [2] Palæos.com 13 Oct 2006
• [3]