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Introduction to Deuterostomes

Introduction to Deuterostomes. Quick Look at Hemichordata. Deuterstome Definition. eucoelomate, bilateral eumetazoans how embryonic mouth is formed 2 nd opening of gut to ectoderm blastopore becomes anus. sea urchin embryo: Campbell Fig. 47.9. Animal Phylogeny (review). Deuterostomia.

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Introduction to Deuterostomes

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  1. Introduction to Deuterostomes Quick Look at Hemichordata

  2. Deuterstome Definition • eucoelomate, bilateral eumetazoans • how embryonic mouth is formed • 2nd opening of gut to ectoderm • blastopore becomes anus sea urchin embryo: Campbell Fig. 47.9

  3. Animal Phylogeny(review) Deuterostomia Parazoa (Porifera) Radiata (Cnidaria) Ecdysozoa Spiralia Protostomia Bilateria Eumetazoa Animalia

  4. Deuterostome Phylogeny Vertebrata Urochordata Cephalochordata Craniata Phylum Echinodermata Hemichordata Chordata Deuterostomia

  5. phylum Hemichordatacompare Hickman Fig. 13-21

  6. Characteristics of Hemichordates • Proboscis, collar, trunk body regions. • Tricoelomic, like echinoderms and ectoprocts • Deuterostomes, like echinoderms and chordates • They have no notochord • Filtering slits in pharynx, like Chordata (feeding and respritory function). • But anus is terminal (no tail) • No myomeres • Main nerve cord has both dorsal and ventral branches

  7. Filtering Deposit-Feederscompare Hickman Fig. 13-22

  8. Hemichordate larvae • Planktonic • Ciliated, complete gut • Not a trochphore larvae • Resembles a starfish larvae

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