PHYLUM - CHORDATA
There are more than 75,000 living chordates and are based on a bilateral symmetry plan.
All species in the phylum chordata have these characteristics in common:
There are more than 75,000 living chordates and are based on a bilateral symmetry plan.
All species in the phylum chordata have these characteristics in common:
- A notochord- (found in the embryos of in the phylum chordata, is composed of cells derived from the mesoderm, and provides the main axial support in embryos)
- A nerve chord (spinal chord)
- Pharangeal slits- (filter feeding and connect pharynx to the back of the throat or to the outside of the neck, usually only seen in embryonic stages, except for fish that have gills)
- Postanal tail- (usually only seen during embryonic development)