chordates-features

Limbs-derivation-From several segments
Notochord-present at some stage or replaced by a backbone made of ringlike vertebrae
Gut position-ventral to nerve cord
Pharyngeal gill-slits-present at some stage of life
Bloodvascular systems-closed
Dorsal blood vessle- Blood flows posteriorly
Hepatic portal systems-present
Respiration-Through gills or lungs
Nervous systems-Hollow
Brain- Dorsal to pharynx in head
Nerve cord-Single ,Dorsal, without ganglia