Reference
Katrin Göbbeler, Annette Klussmann-Kolb (2007): Paddle cilia on the cephalic sensory organs (CSOs) of Opisthobranchia (Mollusca: Gastropoda) - genuine structures or artefacts? – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 55: 223 - 229.