High Quality Content by WIKIPEDIA articles! The family Argulidae contains the carp lice or fish lice – a group of parasitic crustaceans of uncertain position within the Maxillopoda. Although they are thought to be primitive forms, they have no fossil record. Argulidae is the only family in the order Arguloida (occasionally "Arguloidea"), although a second family, Dipteropeltidae, has been proposed.