Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Order Next family	Aplustridae The family Aplustridae (also known as Hydatinidae) includes acteonoideans with thin, strongly inflated shells with low spires. They have large parapodia, lack an operculum and cannot withdraw completely into their shells. The genus Hydatina is nocturnal while Micromelo is diurnal. They feed on polychaete worms. There are at least four species in Hawaii in two genera (Hydatina and Micromelo). Hydatina amplustre Hydatina physis Hydatina zonata  Micromelo undatum
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