†Kirkella yersini Hintze 1952 (shark)
Full reference: L. F. Hintze. 1952. Lower Ordovician trilobites from western Utah and eastern Nevadea. Utah Geological and Mineralogical Survey Bulletin 48:249 p.
Belongs to Kirkella according to L. F. Hintze 1952
Sister taxa: Kirkella elliptica, Kirkella fillmorensis, Kirkella indentata, Kirkella typicalis
Type specimen: 26281 (AMNH), an exoskeleton (cranidium)
Ecology: nektonic carnivore