an Entity references as follows:
Crustaceomorpha is a proposed clade of arthropods that includes crustaceans and numerous extinct groups. Synapomorphies for the clade are that the larval antenna is a feeding or locomotory organ, and there are six endopodal podomeres in post-antennal limbs. Extinct groups included in Crustaceomorpha vary considerably. It includes Agnostida (usually treated under Trilobita), Waptiida, , Phosphatocopida, and Bradoriida, among others. These primitive crustaceomorphs are grouped under .