Ax, P.; Weidemann, E.; Ehlers, B. (1978). Zur Morphologie sublitoraler Otoplanidae (Turbellaria, Proseriata) von Helgoland und Neapel. [On the morphology of sublittoral Otoplanidae (Turbellaria, Proseriata) from Helogoland and Naples.]. Zoomorphologie, 90:113-133.