Presentation is loading. Please wait.

Presentation is loading. Please wait.

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.

Similar presentations


Presentation on theme: "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."— Presentation transcript:

1 Acoelomates & pseudocoelomates Zoology, 25 February 2008 Donald Winslow Following Hickman, et al Ch. 14 (pp ) Ch.15 (pp ) Ch.18 (pp )

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


Download ppt "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."

Similar presentations


Ads by Google