The family Munnopsidae is a family of asellote isopoda which is one of the most speciose and frequently collected of the known isopod families. As currently structured it consists of nine subfamilies, 44 genera and about 364 species. The Munnopsidae is frequently the most abundant and diverse isopod family in benthic deep−sea communities and also has a wide distribution in cold waters.

Bathyopsurus nybelini, a member of this family, has been known to consume Sargassum that has fallen to the seabed.

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