Semicassis bisulcata, common name: the Japanese bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.

They are carnivorous and mainly feed on other smaller marine gastropods like Umbonium vestiarium.

[3] This species occurs in the Red Sea and in the Indo-West Pacific.

Media related to Semicassis bisulcata at Wikimedia Commons

This Cassidae-related article is a stub.