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Phenacovolva (Pellasimnia) gracilis (Adams, A. & Reeve, 1848).
I changed it on 4 August 2017 into Phenacovolva subreflexa (G. B. Sowerby II, 1848) [Ovulum].
The above specimens were identified using POPPE-IMAGES.
Species of the family Ovulidae Fleming, 1822 are sometimes mistaken for seaslugs, especially when the shell is covered by the large colourful mantle. Let me quote Bill Rudman:
"One easy way to separate snails from slugs is to look for their eyes. If they are raised from the skin like this then they are a snail. If the eyes are embedded in the skin they are an opisthobranch."
How to cite:
Köhler, E. (2017), published 4 August 2017, Phenacovolva subreflexa (G. B. Sowerby II, 1848)
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Ovulidae/Phenacovolva_subreflexa/Phenacovolva_subreflexa.htm