Cumacea is an
order of small marine
crustaceans of the superorder Peracarida, occasionally called
hooded shrimp or comma shrimp. Their unique appearance and uniform
body plan makes them easy to distinguish from other crustaceans. They live in soft-bottoms such as mud and sand, mostly in the marine environment. There are more than 1,500 of species of cumaceans formally described. The species diversity of Cumacea increases with depth.