|Named By:||Watson in 1909|
|Time Period:||Early Jurassic|
|Fossil(s):||At least one almost complete specimen|
|Classification:||| Chordata | Reptilia | Sauropterygia | Plesisauria | Plesiosauridea ||
|Also known as:||| Plesiosaurus homalospondylus | Plesiosaurus macropterus ||
Microcleidus is an extinct genus of sauropterygian reptile belonging to the plesiosauroidea suborder. 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.