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Lepospondyli
Lepospondyli is a diverse group of Paleozoic tetrapods (four-limbed vertebrates). With the exception of one late-surviving lepospondyl from the Late Permian of Morocco (''Diplocaulus minumus''), the group lived from the Early Carboniferous (Mississippian) to the Early Permian and was geographically restricted to what is now Europe and North America.〔Carroll, R. L. (1988) ''Vertebrate Paleontology and Evolution'', WH Freeman & Co.〕 Five major groups of lepospondyls are known: Adelospondyli; Aïstopoda; Lysorophia; Microsauria; and Nectridea. Lepospondyls have a diverse range of body forms and include species with newt-like, eel- or snake-like, and lizard-like forms. Various species were aquatic, semiaquatic, or terrestrial. None were large (the biggest genus, the diplocaulid ''Diplocaulus'', reached a meter in length, but most were much smaller), and they are assumed to have lived in specialized ecological niches not taken by the more numerous temnospondyl amphibians that coexisted with them in the Paleozoic. Lepospondyli was named in 1888 by Karl Alfred von Zittel, who coined the name to include some tetrapods from the Paleozoic, that shared some specific characteristics in the notochord and teeth.
==Description==
All lepospondyls are characterised by having simple, spool-shaped vertebrae that did not ossify from cartilage, but rather grew as bony cylinders around the notochord. In addition, the upper portion of the vertebra, the neural arch, is usually fused to the centrum (the main body of the vertebra).〔Colbert 1969〕
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