Chordata, Nonvertebrate

**Definition:** A portion of the animal phylum Chordata comprised of the subphyla CEPHALOCHORDATA; UROCHORDATA, and HYPEROTRETI, but not including the Vertebrata (VERTEBRATES). It includes nonvertebrate animals having a NOTOCHORD during some developmental stage.

**Tree numbers:** - B01.050.150.200 - B01.050.500.272

**Synonyms:** - Invertebrate Chordate