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Exploring Invertebrate Chordates: Cephalochordata and Urochordata

This chapter delves into the fascinating world of invertebrate chordates classified under Phylum Chordata. Chordates possess distinctive features such as a notochord, dorsal nerve cord, pharyngeal pouches, and postanal tail. We explore the three subphyla: Vertebrata, Cephalochordata (lancelets), and Urochordata (tunicates). Lancelets thrive in warm, shallow waters and exhibit weak swimming abilities, while tunicates, known as sea squirts, filter-feed and are primarily sessile. Understanding their unique adaptations enhances our knowledge of evolutionary biology.

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Exploring Invertebrate Chordates: Cephalochordata and Urochordata

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  1. Chapter 38 Section 2 Invertebrate Chordates

  2. Phylum Chordata • Chordates- animals with a vertebrate (backbone) • Have a notochord, pharyngeal pouches, dorsal nerve cord, & postanal tail

  3. Evolution & Classification • Phylum Chordata is separated into three subphyla • Vertebrata • Cephalochordata • Urochordata

  4. Subphylum Cephalochordata • Lancelets- notochord, dorsal nerve cord, pharyngeal pouches, & postanal tail • Live in warm shallow waters in the sand • Water leaves body through an opening called the atriopore

  5. Subphylum Cephalochordata • Lancelets can swim weakly • Segmented body

  6. Subphylum Urochordata • Tunicates- “sea squirts”- shoot out water when touched • Most are sessile & live on sea bottom • Filter-feed • Hermaphrodites

  7. REVIEW!!! • What are the three subphyla of the phylum chordata? • Name an animal from each subphyla.

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