Dimetrodon 0.81" Neural Spine Fragment rockinaboxgembonependant Above: A fossilized Hyracodon skeleton

Above: A fossilized Hyracodon skeleton in the Los Angeles Natural History Museum (Source: Dawn Pedersen/Flickr)

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During the Ordovician

cephalopods like ammonites

Dimetrodon 0.81" Neural Spine Fragment rockinaboxgembonependant Above: A fossilized Hyracodon skeletonRare Permian Material! If all fossils are out of stock, sign up for email notifications as we do expect to get more over time. With a fearsome jaw and reptilian appearance, Dimetrodon is often mistaken for a dinosaur. However, this family of Early Permian Age species falls into a disparate taxonomic clade known as Synapsids which includes Mammals. This specimen is a 0. 81" fossil fragment of the Dimetrodon's iconic spine. The purpose of the spine sail