Acoelomates & pseudocoelomates

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Platyhelminthes Acoelomate Flatworms.

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Presentation transcript:

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) Lophotrochozoa Acoelomate worms, pseudocoelomate worms Ecdysozoa Pseudocoelomate or eucoelomate Superphylum Deuterostomia (triploblastic)

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.

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

Phylum Platyhelminthes Class Turbellaria Class Trematoda Class Monogenea Class Cestoda

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

Lophotrochozoan pseudocoelomates Phylum Rotifera Phylum Acanthocephala Phylum Gastrotricha Phylum Entoprocta

Ecdysozoan Pseudocoelomates Phylum Nematoda Phylum Nematomorpha Phylum Kinorhyncha Phylum Loricifera Phylum Priapulida

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