Platycrinitidae
Platycrinitidae is an extinct family of Paleozoic stalked crinoids.
File:Platycrinites hemisphericus, Royal Tyrrell Museum, Drumheller, Alberta, 2025-07-13.jpg|left|thumb|Platycrinites hemisphaericus. Early Carboniferous, Muldraugh Formation, Indiana. At the Royal [Tyrrell Museum of Palaeontology].
These stationary upper-level epifaunal suspension feeders lived during the Devonian, Permian and the Carboniferous periods, from 416.0 to 259.0 Ma.