BIOL 2030 Lecture : Nematoda
12 Nov 2012
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Document Summary
Rotifera phylum of microscopic, multicellular, pseudocoelomate animas, living mostly in fresh water. They are generally cone-shaped with a crown of cilia at the widest end surrounding the mouth. The epidermis is separated from the internal organs by a fluid-filled space, the pseudocoel. Formerly called wheel animals, as the crown of beating cilia looks as though it"s rotating. Slender, pseudocoelomate, unsegmented worms circular in cross- section. Some (eelworms) are serious parasites of plants, others are parasitic in animals and some are free-living in soil and marine muds. Parasitic nematodes causing severe diseases in humans include the hookworms. Pseudocoelomate animals whose body cavity is a pseudocoel and not a true coelom. Pseudocoel fluid-filled cavity between epidermis and internal organs in rotifers, nematodes, and some other invertebrates lacking a true coelom. Corona ciliated disc or circular band of certain animals such as rotifers. Mastax pharynx of rotifers, containing jaw-like structurs used to grind small food.
