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| Taxonomy | Phylogeny |
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The pelycosaurs (from pelyx meaning 'bowl' and sauros meaning 'lizard') were smallish to large (up to 3 meters or more) primitive Late . They appeared during the and reached their acme in the , remaining the dominant land animals for many millions of years. A few stragglers continued into the .
Well-known pelycosaurs include the , , , and .
The traditional Pelycosauria is with regard to the .
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Stratigraphic range: - Late
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- Phylum:
- Superclass:
- Class: (classic definition)
- Subclass: (made a class in Benton 2000, 2004)
- Order: Pelycosauria
- Subclass: (made a class in Benton 2000, 2004)
- Class: (classic definition)
- Superclass:
Author: ,
Environment: Semi-aquatic, terrestrial water margins, some forms may have lived in more upland environments
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At least two pelycosaur independently evolved a tall sail, consisting of elongated vertebral spines: the and the . In life, this would have been covered by skin, and possibly functioned as a device or for mating display. Pelycosaur fossils have been found mainly in and , although some small, late-surviving forms are known from and .