Phymosoma texanum
Echinoid
Lower Cretaceous
Walnut Formation
Comanche County, Texas, USA

26mm echinoid.

Phymosoma is an extinct genus of sea urchin known from the Middle Jurassic to Early Paleocene of the Americas, Europe, and Africa.  It tends to be uncommon where it occurs and specimens tend to exhibit some crushing or look like something took a bite out of it.

This is an above-average specimen and at a good price.