1.9" Pennsylvanian Phyllocarid (Concavicaris) Fossil - Iowa

Pennsylvanian Phyllocarid (Concavicaris) Fossil - Iowa #262606

This is a phyllocarid (Concavicaris sp.) fossil from the Pennsylvanian-aged Stark Formation near Thayer, Iowa. It's 1.9" long and rests on a 4.2 x 3.6" rectangular piece of slate.

It comes with an acrylic display stand.

Phyllocarids are a type of arthropod that first developed during the Cambrian. They had a hard protective shell, hinged carapace, and were thought to have a lifestyle similar to shrimp. Exactly how they fit into the arthropod taxonomy is still under debate: they may represent either a stem-lineage euarthropod or a primitive branchiopod crustacean.