Definitions

1. noun

an order of small, mainly marine, crustaceans (shrimps and prawns) that have a distinctive body shape and are often parasitic on other animals

“The marine biologist studied the mysidacea species found in the estuary.”

2. noun

a suborder of Mysidacea, often considered a synonym for the entire order

“The researcher focused on the various types of mysidacea found in the ocean.”