Stygiomysida is a small order of malacostracan crustaceans in the superorder Peracarida. It has traditionally been considered part of the order Mysida (opossum shrimps), but was separated from it on phylogenetic grounds.

Families:

• Lepidomysidae Clarke, 1961 (1 genus, 9 species)
• Stygiomysidae Caroli, 1937 (1 genus, 7 species)

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