What is "branchiura"

Branchiura \Bran"chi*u"ra\, n. pl. [NL., fr., Gr. ? gill + o'yra` tail.] (Zo["o]l.) A group of Entomostraca, with suctorial mouths, including species parasitic on fishes, as the carp lice ( Argulus).

Branchiura is a group of crustaceans ranked as a subclass of the class Maxillopoda. It comprises the fish lice of the family Argulidae, and the prehistoric Cyclida ("cycloids").