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Phylum Chordata

Explore the trademarks and characteristics of Phylum Chordata, including notochord, dorsal nerve cord, pharyngeal gill slits, and post-anal tail. Learn about invertebrate and vertebrate chordates and their classifications.

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Phylum Chordata

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  1. 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

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