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Acoelomates & pseudocoelomates

Acoelomates & pseudocoelomates. Zoology, 25 February 2008 Donald Winslow Following Hickman, et al. 2008 Ch. 14 (pp 290-306) Ch.15 (pp 314-328) Ch.18 (pp 385-393). Bilateria. Bilateral symmetry & cephalization Phylum Acoelomorpha (diploblastic) Superphylum Protostomia (triploblastic)

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Acoelomates & pseudocoelomates

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  1. Acoelomates & pseudocoelomates Zoology, 25 February 2008 Donald Winslow Following Hickman, et al. 2008 Ch. 14 (pp 290-306) Ch.15 (pp 314-328) Ch.18 (pp 385-393)

  2. Bilateria • Bilateral symmetry & cephalization • Phylum Acoelomorpha (diploblastic) • Superphylum Protostomia (triploblastic) • Lophotrochozoa • Acoelomate worms, pseudocoelomate worms • Ecdysozoa • Pseudocoelomate or eucoelomate • Superphylum Deuterostomia (triploblastic)

  3. Acoelomate worms • Primary bilateral symmetry • No coelom • Three germ layers • Organ-system level of organization • Muscles for locomotion & feeding • Excretory system • Phyla Platyhelminthes, Nemertea, etc.

  4. Phylum Platyhelminthes • “flatworms” • Free-living & parasitic species • Anterior ganglia, ladder-type NS • Sensory organs • Excretory system • Usually hermaphroditic & outcrossing • Parasitic spp w/ complex life-cycles

  5. Phylum Platyhelminthes • Class Turbellaria • Class Trematoda • Class Monogenea • Class Cestoda

  6. Other acoelomate phyla • Phylum Acoelomorpha • (Phylum Mesozoa)—not triploblastic • Phylum Nemertea • Phylum Gnathostomulida

  7. Lophotrochozoan pseudocoelomates • Phylum Rotifera • Phylum Acanthocephala • Phylum Gastrotricha • Phylum Entoprocta

  8. Ecdysozoan Pseudocoelomates • Phylum Nematoda • Phylum Nematomorpha • Phylum Kinorhyncha • Phylum Loricifera • Phylum Priapulida

  9. Phylum Nematoda • Longitudinal muscles & muscular pharynx • Anterior & posterior nerves, sense organs • Usually separate sexes • Females larger than males • Microscopic eggs • Eutely

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