1. pelycosaurs
Wikipedia definition
2. PelycosaurThe pelycosaurs (from Greek πέλυξ - pelyx "axe" or perhaps "bowl"/"pelvis" and σαῦρος sauros "lizard") are an informal grouping (previously considered an order) 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.
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