Phylum Chordata
Invertebrate Chordates
Vertebrate Chordates
Trademarks
of Phylum Chordata
Trademarks
of Phylum Chordata
1.
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•
•
•
Notochord
SemiSemi-rigid rodrod-like structure
Present at some time during dvlpmnt.
dvlpmnt.
Made of cartilage
Functions:
Functions:
1. Stiffening
2. Axis for muscle attachment
Trademarks
of Phylum Chordata
2. Hollow Dorsal Nerve Chord
3. Pharyngeal Gill Slits or Pouches
• Anterior end is brain
• Is spinal chord in vertebrates
• Location: where pharynx will be
• Present at some time during
life cycle
Trademarks
of Phylum Chordata
Pharynx
4. Post – Anal Tail
™
Pharynx
• Function: propulsion
• Very good for swimming
1
Other Chordate Characteristics
Phylum Chordata
• Bilateral symmetry
• WellWell- developed coelom
• Ventral heart
• Complete digestive tract
• Endoskeleton (bone or cartilage or
Includes:
1. Invertebrate Chordates
both)
• Subphylum Urochordata
• Subphylum Cephalochordata
2. Vertebrate Chordates
• Subphylum Vertebrata
Subphylum Urochordata
Subphylum Urochordata
1. Tunicates and Sea Squirts
2. Marine bottom dwellers
3. Sessile adults with a leathery tunic
4. Larvae possess all 4 chordate
• Pastel Sea Squirt
Subphylum Urochordata
Subphylum Cephalochordata
trademarks
• Blue Bell tunicate
1.
2.
3.
4.
5.
6.
Lancelets (Amphioxus)
Marine
FishFish-like shape, pointed at both ends
Silver in color
Small
Closed circulatory system
2
Lancelet
• Amphioxus
3