malacostracan

adjective

1. belonging or pertaining to the crustacean subclass Malacostraca, which includes the lobsters, shrimps, crabs, etc.

noun

2. a malacostracan crustacean.

noun

1. any crustacean of the subclass or group Malacostraca, including lobsters, crabs, woodlice, sand hoppers, and opossum shrimps

adjective Also: malacostracous

2. of, relating to, or belonging to the Malacostraca