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Cnidarians
The group cnidaria includes organisms with
large variations in size and appearance. This group includes the hydroids
(e.g. hydractinia
echinata), the jellyfish (e.g. lion´s
mane jellyfish) and other cnidarians (e.g. sea-pens, cup coral and the
coelentrates). What have they got in common? Do they percieve? Can a jellyfish
see? How kan jellyfish that consist predominantly of jelly, live? What and
how do cnidarians eat? Why are they called cnidarians? Is it because of
their stinging cells?
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