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Cnidaria Key Words.doc

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Jon Houseman

BIO 2135 Cnidarian KeywordsAboral Surface In radially symmetric animals there is no anterior posterior left or right sides to the animal Instead we refer to the two sides of the animal by the location of the mouth In this case it is the side opposite the mouth Acontia threadlike defensive organs composed largely of nettling cells thrown out of the mouth or special pores of certain cnidarians when irritated found at the base of anthozoans gastrovascular cavityAnthozoa include anemones and corals that have a polyp only life cycle They have biradial symmetry They are big and need to take in a lot of food siphonoglyphsBiradial Symmetry the organism appears radially symmetric but at least one set of structures is paired This results in only two planes of symmetry that pass through the oralaboral axis of the animal Blastula a stage in the development of multicellular animals in which only one cell layer is present the blastoderm the cavity the cells surround in the blastocoelBudding is a form of asexual reproduction where a small part of the body separates from the parent and develops into a complete organism Cnidaria a phylum containing over 10000 species of animals found exclusively in aquatic and mostly marine environments It includes jelly fish coral anemones etcCnidocil a modified flagellum on the cnidocyte that causes the nematocyst inside to fire The stimulus involves some sort of chemical cue touching the cnidocil doesnt fire the nematocyst Cnidocytes specialized cells found only in the cnidaria When these cells evert a nematocyst is discharged The nematocyst may act as a stinger or a sticky thread to entangle and capture preyCnidoglandular lobe Complete Septa Connexon form the pores between cells to allow for cell to cell communication gap junctionsCubozoa class of cnidarians that look like cubes box jelly fish They have a unique eye and a pedalia for feeding Digestive Epithelium layer of epithelium inside the cnidarian where digestion takes place
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