Leafy Hornmouth

Ceratostoma foliatum

Leafy Hornmouth, a medium to large sea snail, features a shell characterized by spiral ridges and at least three prominent wing-like structures, which may be worn down in older individuals. The shell coloration ranges from brown and white to creamy-white, with young snails displaying tooth-like projections on the lip. This species is found in the Eastern Pacific, specifically along the California coast and the West coast of North America, inhabiting depths from the low intertidal zone down to 60 meters. Most occurrences are shallower than 40 meters, with a significant number recorded under 20 meters. As a benthic organism, the Leafy Hornmouth primarily feeds on small invertebrates, using its radula to bore through the shells of its prey, which includes clams, mussels, and barnacles. The species is a non-broadcast spawner, and its life cycle does not include a trocophore stage. Encountering this snail while diving can be intriguing, as divers may observe its unique shell structure and feeding behavior in its natural habitat. The conservation status of Leafy Hornmouth is currently not evaluated by the IUCN, indicating a lack of specific data regarding its population trends. However, it has been recorded at various dive sites, suggesting that it may be relatively accessible for divers exploring its range.