M3A1L1A1C3O1S1T1R1A1C3A1N1S1
20 points
MALACOSTRACANS is validvalid
MALACOSTRACAN, [n]
MALACOSTRACAN, any of a large subclass of crustaceans having a thorax consisting of eight segments usually covered by a carapace and including the decapods and isopods [n]