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Biology Voc 29

Biology Vocabulary Chapter 29

TermDefinition
Ostia Tiny opening in pores where water enters sponges.
Oscula Larger openings in sponges were water exits.
Sessile Sponges are firmly attached to the sea floor or some other surface.
Choanocytes Flagellated cells that line the internal cavity of a sponge.
Amoebocytes Sponge cells that have irregular amoeba-like shapes.
Spongin Flexible resilient protein fiber that makeup the skeleton of some sponges.
Spicule Tiny needles of silica or calcium carbonate that form some sponges skeleton.
Gemmule Clusters of Amoebocytes encased in protective coats.
Medusa Free floating, life form cnidarian and umbrella shaped.
Polyp Body form a cnidarian that is attached to a rock or other object, mouth is located at the free end.
Cnidocyte Stinging cells located on the tentacles of cnidarians.
Nematocyst Small barbed harpoon Inside a cnidocyte.
Basal disk Area of a hydra that produces a sticky secretion which is used to attach to the seafloor or other surfaces.
Planula Zygotes that develop into free-swimming larvae.
Proglottid Body segments of flatworms and tapeworms.
Fluke Parasitic tapeworms that are in the class trematoda.
Tegument Protective covering of endoparasitic flukes.
Created by: emmaley
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