Dimetrodon Spine Sail Fragments protomammal The film was an instant

The film was an instant success

In any case

and axes all fall under the designation of celt

This specimen is a fossil bone fragment of the Apatosaurus

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Dimetrodon Spine Sail Fragments protomammal The film was an instantWith a fearsome jaw and reptilian appearance, Dimetrodon is often mistaken for a dinosaur. However, this family of Early Permian Period species falls into a disparate taxonomic clade known as synapsids which includes mammals. This specimen is a fossil fragment of the Dimetrodon's iconic spine. The purpose of the spine sail is unknown, though speculation ranges from thermoregulation and locomotion.