एक टेमेटोड कीड़े के टैडपोल के आकार का परजीवी लार्वा; पूंछ वयस्क अवस्था में गायब हो जाती है

cercaria's Usage Examples:

The cercaria are directly infective to the definitive hosts.

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

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.

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.

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

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

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.

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

truncatulus harbours the Cercaria of Fasciola hepatica, the liver-fluke, which causes rot in sheep. Ancylus, which occurs in rivers, has a minute limpet-like shell.

cercaria's Meaning':

tadpole-shaped parasitic larva of a trematode worm; tail disappears in adult stage