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WCHS Zoology Chapter 9 Cnidaria

Cnidaria the phylum of animals whose members are characterized by radial or biradial symmetry, diploblastic organization, a gastrovascular cavity, and nematocysts, jellyfish, sea anemones, and their relatives
epidermis a sheet of cells covering the surface of an animal's body; in invertebrates, a single layer of ectodermal epithelium
gastrodermis the endodermally derived lining of the gastrovascular cavity of Cnidaria
mesoglea a gel like matrix between the epidermis and gastrodermis of cnidarians
polyp the attached, usually asexual, stage of a cnidarian
cnidocytes the cells that produce and discharge the chidae in members or the phylum Cnidaria
cnida an organella characteristic of the cnidaria thaat is used in defense, food gathering and attachment
nematocysts a cnidarian cnida usually armed with spines or barbs and containing a venom that is injected into a prey's flesh
medusa usually, the sexual stage in the life cycle of cnidarians, the jellyfish body form
gastrovascular cavity the large central cavity of cnidarians and flatworms that recieves and digests foods. Has a single opening serving as both mouth and anus
hydrostatic skeleton the use of body cavity fluids, confined by the body wall, to give suport, also called hydroskeleton
planula a ciliated, freeswimming larva of most cnidarians, the planula develpos following sexual reprocution and metamorphoses in to a polyp
gastrozooid a feeding polyp in a colonial hydrozoan
gonozooid a polyp of a hydrozoan cnidarian that produces medusae
gonionemus a hydrozoan in which the medusa stage predominates, it lives in shallow marine waters where it often clings to seaweeds by adhesive pads on its tentacles
obelia small medusae from on a stalklike structur3e of the gonozooid, when mature break free and swimout an opening at the end of the gonozooid
manubrium a structure tath hangs from the oral surface of a cnidarian medusa and surronunds the mouth
statocyst an organ of equilibrium and balance in many invertebreates, usually consit of a fluid-filled cavity containng sensory hairs and a mineral mass called statolith, stimulates the sensory hairs, which helps orient the animal to the pull of gravity
hydra a common freshwater hydrozoan that hangs from the underside of floating plants in clean streams oand ponds, lacks a medusa stage and reproduces both asexual by budding from the side of the polyp and sexually
aurelia a common scyphozoan in both Pacific and Atlantic coastal waters of North America, the margin of its medusa has a fringe of short tentacles and is divided by notches
rhopalium a sensory structure at the margin of the scyphozoan medusa, it consists of a statocyst and a photoreceptor
ephyrae Miniature medusa produced by asexual budding of a scyphistoma, ephyrae mature into sexually mature medusae
scyphistoma the polyp stage of a scyphozoan, develps from a planula and produces ephyrae by budding
protandry the condition in a monoecious (hermaphroditic) organism in which male gonads mature before female gametes, prevents self-fertilization
Created by: dmoudy