Microcleidus

Microcleidus is an extinct genus of sauropterygian reptile belonging to the plesiosaur suborder. It was about the size of a medium sized dolphin, reaching a length of 3 metres (9.8 ft).[citation needed] The species has 40 neck vertebrae and a short tail of 28 vertebrae.

Classification
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.[1] It was later found to be a species of Microcleidus.

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