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Phylum Hemichordata

Phylum Hemichordata. Zoology- Mrs. Adams. “Half Vertebrate”. Hemichordates display some characteristics of invertebrates and vertebrates Coelomates Deuterostomes Have dorsal and ventral nerve cord, gill slits, postanal tail, NO NOTOCHORD.

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Phylum Hemichordata

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  1. Phylum Hemichordata Zoology- Mrs. Adams

  2. “Half Vertebrate” • Hemichordates display some characteristics of invertebrates and vertebrates • Coelomates • Deuterostomes • Have dorsal and ventral nerve cord, gill slits, postanal tail, NO NOTOCHORD

  3. Coelomates- true body cavity lined with mesoderm • EX: all other animals

  4. Protostomes vs. Deuterostomes • Zygote cleaves to become blastula and then forms gastrula. The blastopore of the gastrula can become either the mouth or the anus of the organism • Protostome- Blastopore becomes the mouth. Ex-Annelids, Mollusks and arthropods • Deuterostome- Blastopore becomes anus. Ex-echinoderms, hemichordates,chordates

  5. Embryonic Development • Protostome • Blastopore becomes mouth • Deuterostome • Blastopore becomes anus

  6. Phylum Hemichordata • Three body regions • Proboscis • Collar • Trunk • Deuterostome • Gill slits • Open circulatory system • Dorsal and ventral nerve cord • Ex. acorn worms

  7. Protostome=proboscis Collar trunk

  8. Lifestyle • coastal and deep ocean • benthic (live in sand) • Rarely seen by humans • Size ranges – a few millimeters to 1.5 meters • Use proboscis to decompose organic material in sand • Release feces(poop) in coils • Separate sexes release gametes

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