†Undithyrella Havlicek 1971 (lamp shell)
Parent taxon: Atrypida according to J. J. Sepkoski 2002
Sister taxa: Anazygidina, Antelocoelia, Atrypidina, Davidsoniidina, Lissatrypidina, Wutubulakia, Zygospirinae
Subtaxa: none
Ecology: stationary epifaunal suspension feeder