1. Invertebrate Chordates Vertebrate Chordates
Phylum Chordata
Invertebrate Chordates
Vertebrate Chordates

2. Trademarks of Phylum Chordata
Notochord
Semi-rigid rod-like structure
Present at some time during dvlpmnt.
Made of cartilage
Functions:
1. Stiffening
2. Axis for muscle attachment

3. Trademarks of Phylum Chordata
2. Hollow Dorsal Nerve Chord
Anterior end is brain
Is spinal chord in vertebrates

4. Trademarks of Phylum Chordata
3. Pharyngeal Gill Slits or Pouches
Location: where pharynx will be
Present at some time during
life cycle

5. Pharynx
Pharynx

6. Trademarks of Phylum Chordata
4. Post – Anal Tail
Function: propulsion
Very good for swimming

7. Other Chordate Characteristics
Bilateral symmetry
Well- developed coelom
Ventral heart
Complete digestive tract
Endoskeleton (bone or cartilage or both)

8. Phylum Chordata Includes: 1. Invertebrate Chordates
Subphylum Urochordata
Subphylum Cephalochordata
2. Vertebrate Chordates
Subphylum Vertebrata

9. Subphylum Urochordata
Tunicates and Sea Squirts
Marine bottom dwellers
Sessile adults with a leathery tunic
Larvae possess all 4 chordate trademarks

10. Subphylum Urochordata
Pastel Sea Squirt

11. Subphylum Urochordata
Blue Bell tunicate

12. Subphylum Cephalochordata
Lancelets (Amphioxus)
Marine
Fish-like shape, pointed at both ends
Silver in color
Small
Closed circulatory system

13. Lancelet
Amphioxus