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Lecture

Nematoda

4 Pages
155 Views

Department
Biology
Course Code
BIOL 2030
Professor
Scott Kelly

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Description
Pseudocoelomates Rotifera Phylum of microscopic multicellular pseudocoelomate animas living mostly in fresh water They are generally coneshaped with a crown of cilia at the widest end surrounding the mouth The epidermis is separated from the internal organs by a fluidfilled space the pseudocoel Formerly called wheel animals as the crown of beating cilia looks as though its rotating Nematoda Roundworms Slender pseudocoelomate unsegmented worms circular in crosssection Some eelworms are serious parasites of plants others are parasitic in animals and some are freeliving 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 Fluidfilled cavity between epidermis and internal organs in rotifers nematodes and some other invertebrates lacking a true coelom It is derived from the embryonic blastocoel Eutelic Mitotic divisions cease early in development Corona Ciliated disc or circular band of certain animals such as rotifers Mastax Pharynx of rotifers containing jawlike structurs used to grind small food Trophi Hard jawlike structures in the pharynx of rotifers used to grind food Parthenogenesis Reproduction from a female gamete without fertilization by a male gamete Bdelloidea A class of rotifers found in fresh water and moist soil Typically have a welldeveloped corona divided into two parts on a retractable head Amictic Not mixed ie no males Mictic MalesfemalesDiapause Spontaneous state of dormancy occurring in the life cycle Cuticle Outer layer of material of various composition produced by the epidermal cells that covers the body of many invertebrates Cryptobiotic Ametabolic state of life entered by an organism in response to adverse envt cond Hypodermis A layer of cells often a syncytium underlying the cuticle in nematode worms Syncytium Multinucleate mass of protoplasm which is not divided into separate cells PseudocoelomatesRotiferaNematodaPossess a fluid or gelatinous filled pseudocoelAdaptive Potential have complete digestive tract o Space for dev Of sophisticated organ systems o Simple circulation of material through body o Fluid storage area for waste buildup prior to processing o Hydrostatic support DevelopmentEutely mitotic divisions cease early body sizebc increase in cell size as opposed to number o Different organstissues characterized by speciesspecific numbers of nuclei
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