Chordates - Chordates Characteristics: Big 3 1. Hollow...

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Chordates Characteristics: Big 3 1. Hollow Dorsal nerve chord 2. Notochord- supporting rod 3. Pharyngeal slits 4. Cells that bind Iodine to protein (endostyle or thyroid) 5. Heart that pumps blood ventrally in the anterior direction 6. Post-anal tail 7. Segmented What kind of animals show these characteristics? Phylum – Chordata Subphylum- Craniata (vertebrata) All animals w/ backbone and few w/o (hagfish) Have brain case Subphylum- Cephalochordata Branchiostoma; Amphioxus Notochord extends to anterior tip Subphylum- Urochordates Sea squirts, tunicates Notochord in tail of larvae + nerve chord How did chordates arise? Deuterostomes- Phylum Hemichordata (acorn worms) Phylum Echinodermata (star fish, sea cucumbers, sand dollars) Amphioxus (cephalochordate) 1. Life Style a. Marine, bottom dwellers 2. Locomotion a. Swimming-segmented muscles + notochord provides strength b. Burrowing 3. Feeding a. Large mouth b. Cirri- sensory/ mechanical + chemical c. Wheel organ- Cilia makes h2o surrnet
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Chordates - Chordates Characteristics: Big 3 1. Hollow...

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