†family Plethospiridae Wenz 1938 (snail)
Parent taxon: Murchisonioidea according to D. M. Rohr and R. B. Blodgett 2001
Sister taxa: Berouniconcha, Cheeneetnukiidae, Hormotomidae, Kaseiella, Kosovoconcha, Mendelia, Murchisoniidae, Pithodeidae
Subtaxa: Kirkospira, Plethospirinae
Ecology: facultatively mobile epifaunal suspension feeder