Coelenterates have a comparatively simple physiology. They
are basically a sac of jelly which contains their internal organs. The sac has
an opening their mouth, this is surrounded by tentacles. The tentacles have
stinging structures called nematocysts, which are used to stun or paralyse
their prey. After stinging, the tentacles pull the prey into the mouth. Each
individual is known as a polyp. Coelenterates that are found on Cornish shores
include the sea anemones, true jellyfish and the hydroids.
Coelenterates (Phylum Coelenterata or
Cnidaria) include jellyfish, anemones, corals, and
hydras. The phylum is characterized by a gelatinous
body, tentacles, and stinging cells called nemadocysts. Most species
are found in marine waters, but some occur in brackish or even fresh water.
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