[general category of the kingdom Animalia (multicellular animals) including those phyla whose members lack a notochord; ie, all animals except vertebrates in the phylum Chordata. ( CSP )]
UMLS (NCI) C0021948 Relation/PAR: animal
Relation/CHD: Acanthocephala
Annelida
arthropod
Cnidaria
Echinodermata
Mollusca
Nematoda
flatworm
Porifera
Rotifera