Mycterosaurus
Encyclopedia
Mycterosaurus was a pelycosaur
Pelycosaur
The pelycosaurs are an informal grouping composed of basal or primitive Late Paleozoic synapsid amniotes. Some species were quite large and could grow up to 3 meters or more, although most species were much smaller...

 belonging to the family Varanopidae
Varanopidae
Varanopidae was a family of synapsid "pelycosaurs" that resembled monitor lizards and might have had the same lifestyle, hence their name. No known varanopids developed a sail like Dimetrodon. Their size varied from lizard-sized to dog-sized creatures. Varanopids already showed some advanced...

 of the subfamily Mycterosaurinae. Mycterosaurus is the most primitive member of its family. It lacks some features that its advanced relatives have.
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