Hydatina physis
Hydatina physis is a species of sea snail, a bubble snail, a marine opisthobranch gastropod mollusk in the family Aplustridae. This bubble snail’s distribution is circumglobal in tropical waters. This species lives in shallow water, crawling and burrowing into the sand. It feeds on polychaete worms of the family Cirratulidae, mussels and slugs.
photo credits: Samuel Chow