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Protochordata
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Chordata, Phylum Chordata
• Stiff supporting rod like structure along the back: notochord; found i
all members of the phylum at some stage or the other in life.
• Three fundamental Chordate Characters:
1. A dorsal hollow or tubular nerve chord.
2. A longitudinal supporting rod like notochord.
3. A series of pharyngeal gill slits.
4. Post Anal Tail!
Difference between Nerve Cord and Notochord??
, General Characters of Phylum Chordata
• Aquatic, aerial or terrestrial. All free-living with no parasitic forms.
• Body small to large, bilaterally symmetrical and metamerically segmented.
• A postanal tail usually projects beyond the anus at some stage and may not persist in the
• Exoskeleton often present; well developed in most vertebrates.
• Body wall triploblastic with 3 germinal layers: ectoderm, mesoderm and endoderm.
• Coelomate animals having a true coelome, enterocoelic or schizocoelic in origin.
• A skeletal rod, the notochord present at some stage in life cycle.
• A cartilaginous or bony, living and jointed endoskeleton present in the majority of mem
(vertebrates).
• Pharyngeal gill slits present at some stage; may or may not be functional.
• Digestive system complete with digestive glands.
, Leptocardii
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