root › cellular organisms › Eukaryota › Opisthokonta › Metazoa › Eumetazoa › Bilateria › Protostomia › Ecdysozoa › Panarthropoda › Arthropoda › Mandibulata › Pancrustacea › Crustacea › Multicrustacea › Thecostraca › Cirripedia › Thoracica › Thoracicalcarea › Balanomorpha › Balanoidea