Reference

Bastian Brenzinger, Gerhard Haszprunar, Michael Schrödl (2013): At the limits of a successful body plan – 3D microanatomy, histology and evolution of Helminthope (Mollusca: Heterobranchia: Rhodopemorpha), the most worm-like gastropod – Frontiers in Zoology – 2013: 0001-37-0027.