Cnidaria
Phylum of organisms characterized by stinging cells called nematocysts
Nematocyst
Stinging cell of the Cnidaria.
Scyphozoa
class of cnidaria that are the jellyfish
Anthozoa
Class of Cnidaria that are the anemone and corals
Hydrozoa
Class of the cnidaria that are the hydras and man-o-wars
Cubozoa
class of the Cnidaria that are the box jellies
Disadvantages of the GVC (gastrovascular cavity)
there is only one hole in and out; body systems not speciealized
sessile
attached to the bottom
motile
may move around
Radial Symmetry
round symmetry found in the Cnidaria
3 germ layers (3 tissue layers)
ectoderm, mesoglea, endoderm
the prefix "cnidos"- means
needle
Medusa Stage
Free floating stage, arms faced "down",Example- jelly fish
polyp stage
Sessile stage, arms faced 'up', Example- Coral
Keratin
protein found in human hair and nails, that helps give corals their strength
Calyx
made from calcium carbonate, this gives the polyp of the coral a home (the hard part of corals)