Ridged Pearl-ovulid

Diminovula culmen

Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Littorinimorpha
Family: Ovulidae
Genus: Diminovula
Species: Diminovula culmen

The ridged pearl-ovulid (Diminovula culmen) is a tiny ovulid with a ridge across its shell, camouflaged on soft corals. 'Culmen' means summit or ridge.

Its shell is only about 1 cm long. Its mantle matches the colour and texture of its host coral, on which it feeds.

In the Philippines it is found on soft corals on reefs.

Photo: Micha Baum, CC BY-SA 4.0, via iNaturalist