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27-2 through 27-3
Nematoda Annelida Oligochaeta Hirudinea
25
Biology
9th Grade
02/04/2010

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Term
Nematoda-
Definition
unsegmented roundworms
Term
most numerous and wider spread of all multicellular animals-
Definition
Phylum Nematoda (unsegmented roundworms)
Term
size- microscopic to a meter in length with bilateral symmetry-
Definition
Phylum Nematoda (unsegmented roundworms)
Term
pseudocoelom-false coelom
Definition
phylum nematoda- unsegmented roundworms
Term
2 openings-mouth and an anus
Definition
phylum nematoda (unsegmented roundworms)
Term
phylum nematoda (unsegmented roundworms) respiration, circulation, and excretion by-
Definition
diffusion
Term
phylum nematoda (unsegmented roundworms) reproduction-
Definition
sexual, internal fertilization, separate sexes
Term
about half are free-living
Definition
phylum nematoda (unsegmented roundworms)
Term
parasitic roundworms-
Definition
phylum nematoda (unsegmented roundworms)
Term
Trichinella-
Definition
causes trichinosis-forms cysts in muscles, very painful
Term
filarial worm-
Definition
causes Elephantiasis- blocks lymph vessels
Term
ascarid worm-
Definition
causes malnutrition- eggs hatch in intestines, move to blood stream, to lungs, then coughed up, swallowed again, and cycle starts over
Term
hookworms-
Definition
penetrate bare feet, cause bleeding and anemia
Term
pinworms-
Definition
common in children, cause anal itching
Term
phylum annelida-
Definition
segmented worms (septa-internal walls between segments)
Term
true coelom with bilateral symmetry-
Definition
phylum annelida
Term
phylum annelida complete digestive system with ________ to grind food and a ____ to store food
Definition
gizzard; crop
Term
phylum annelida circulatory system-
Definition
closed
Term
phylum annelida respiration-
aquatic-
land dwellers-
Definition
gills; moist skin (diffusion)
Term
phylum annelida excretion-
Definition
nephridia
Term
phylum annelida nervous system-
Definition
simple
Term
phylum annelida reproduction-
Definition
hermaphroditic, clitellum- thickened band for releasing egg and sperm
Term
phylum annelida movement-
Definition
muscles and setae (bristles on ventral surface)
Term
class oligochaeta-
Definition
earthworms, generate soil
Term
class hirudinea-
Definition
leeches-external blood sucking parasites, used in medicine (reattachments)
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