nematocyst

special cnida organelle which when triggered, ejects a tubular "sting" to penetrate the foe, injecting them with a toxin to paralyze or kill

nematocyte

Cnidarian cell which contains a cnida, which is ejected towards target when cnidocil, a receptor which "smells" for prey/predator (can differentiate between itself & other organisms), is triggered

ptychocyst

specialized cnida organelle used by anemones/corals which adheres to sea floor

mesoglea

jelly-like substance between endoderm and ectoderm tissue layers

Anthozoa

class of the phylum Cnidaria which includes corals, sea anemones, sea fans, have only an asexual polyp form, living in colonies

Hydrozoa

class of the phylum Cnidaria which includes hydra, Portuguese man o' war, with both medusa and polyp forms

Scyphozoa

class of the phylum Cnidaria which includes jellyfish, has very short-lived polyp stage, but is medusa dominant

Cubazoa

class of the phylum Cnidaria which includes box jellies, has short-lived polyp stage but is medusa dominant