How to use Cercaria in a sentence

cercaria
  • By a process of infolding, the thicker end is partially invaginated, the middle portion or " hind-body " and the organism may now present a superficial likeness to a cercaria.

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  • D, An adult redia, containing a daughter-redia, two almost mature cercariae, and germs. E, A free cercaria.

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  • It escapes into the adjacent tissue and there gives rise either to one or more generations of rediae or at once to a new type of organism - the cercaria.

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  • What determines the origin of the cercaria rather than a new generation of rediae is unknown.

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  • The cercaria is just visible to the naked eye and has an oval or discoidal body and usually a long tail of variable form.

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  • The cercaria swims freely for a time and either encysts directly on grass or weeds or it enters a second host which may be another mollusc, an insect, crustacean or fish, and then encysts.

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  • The further development of the cercaria is dependent on the weed or animal in which it lies being eaten by the final host which is usually a predaceous fish or one of the higher vertebrates.

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  • For example the free swimming cercaria and miracidia use highly specialized sensory organelles to locate their hosts.

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  • The cercaria are directly infective to the definitive hosts.

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  • Cercaria have an oral stylet in the oral sucker.

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