These, together with the corals, form the division of the coelenterates known as the Zoantharia, characterised by the possession of simple tentacles, the number of which is a multiple of either five or six.
A few are bitter and in the tropics a number of species feed on poisonous coelenterates about the coral reefs, becoming themselves poisonous in turn.
Those Coelenterates which are not fixed but lead an active, free-swimming life, viz.
But many of the Coelenterates lead an active free-swimming life.
Hydra is the only genus of coelenterates as yet found in fresh water in India, but several others have been discovered in other countries.
The "trichocysts" of certain protozoa bear a certain resemblance to the nettle-cells of coelenterates and probably have similar functions.
The simplest in structure of thecoelenterates are those that constitute the class Hydrozoa.
Chironomus and several species of beetles and Rhynchota); while on the other hand essentially marine coelenterates (Irene ceylonensis, etc.
The ancestors of thecoelenterates settled to the bottom first.
Thus we have noticed that the sponges were the first to settle; then a little later the mass of the coelenterates followed their example.
What characteristic do you find common to all the coelenterates you have studied?
Since nearly all the coelenterates except hydras are marine forms, these will usually have to be dead specimens, preserved in formalin or alcohol, or put up as permanent preparations for the microscope.
Summary of the Comparative Study of Coelenterates 1.
Why are ctenophores more easily seen in the night than other coelenterates are?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "coelenterates" in a variety of sentences. We hope that you will now be able to make sentences using this word.
