ammonites
Imperatoria minima Rigby and Potter 1986 (demosponge)

Demospongea - Agelasida - Preperonidellidae

Full reference: J. K. Rigby and A. W. Potter. 1986. Ordovician sphinctozoan sponges from the eastern Klamath Mountains, northern California. The Paleontological Society Memoir 20 1-47

Belongs to Imperatoria according to J. K. Rigby and A. W. Potter 1986

Sister taxa: Imperatoria fistulata, Imperatoria irregularis, Imperatoria marconii, Imperatoria media, Imperatoria mega, Imperatoria voluta

Type specimen: UNSM 395871

Ecology: stationary epifaunal suspension feeder