Globulocystites levatus
Cystoid
Ordovician (Blackriverian)
Bromide Formation – Pooleville Member
Criner Hills, Carter County, Oklahoma, USA

Loose 23mm.

Globulocystites is a genus of cystoid that lived during the Ordovician Period.  Its remains have been found in Oklahoma and Kentucky.

Cystoids belong to an extinct order of echinoderms from the Ordovician to Devonian Periods.  Similar to crinoids, they had somewhat rounded, plated bodies attached to a stalk that was anchored to the sea bottom.