In this condition they fulfil their last mission; and if their mother, the sporocyst, knew only the joys of agamous maternity, the cercaria which has just become a distome appreciates all the sweetness of sexual maternity.
Mueller recalls to us that which was noticed by Nitzsch on fresh-water shells (Cercaria major) with an annulate and pinnated tail.
Claparede has also observed another free cercaria which bears the name of Pachycerca.
We represent side by side the cercaria of this amphistome, and the adult 204 and sexual amphistome, as it is found in the intestines of the frog.
By drinking the water which contains the cercariaof this species, they grow infested by this singular lodger.
The cercaria is easily recognized by the presence of two particular folds at the base of the buccal bulb, and by the transparency and the form of the extremity of the urinary apparatus.
Some of the cercariae are very tenacious of life; we have kept some alive in fresh water during a whole week in the month of November, and on the last day they were still active (Cercaria armata).
Mueller has long since found Cercaria living freely in the Mediterranean.
There are some grounds for comparing the scolex to the Cercariaof Trematodes, cf.
In the case of Distomum cygnoides, parasitic in the bladder of the Frog, the Cercaria passes directly into the adult host without the intervention of an intermediate host.
Though an encysted Cercaria may remain some months without further change, it eventually dies unless it be introduced into its permanent vertebrate host, an act which is usually effected by the host in which it is encysted being devoured.
This organised nurse, which is about a line in length, is the Cercaria cystophora of Wagener.
All the cercaria at present known are destitute of eyes, but other forms of trematode larvæ are furnished with visual organs.
A migration of the cercariais indispensable to its perfection.
The pupa itself differs from the cercaria in presenting a double crown of hooks surrounding the head, but the other organs correspond with those already described.
A case is on record of two distomata having been extracted from the foot of a woman, into which it has been surmised they gained an entrance as cercaria whilst the woman was bathing.
These cercaria now either become enclosed, like a chrysalis in a pupa state, or they penetrate into the bodies of soft animals, become encysted and parasitic.
The cercaria after a time fixes itself to a submerged plant, becomes encysted, shakes off its tail, and remains in a quiescent state.
The cercaria escapes through an aperture of the nurse, and makes its way out of the snail into the water, where it swims about actively by means of the tail, much in the manner of a tadpole.
If in this condition, in the feeding of sheep or other animals, the tailless cercaria or incipient fluke-worm is transferred to the stomach, it makes its way to the liver, and there grows and is developed into the sexually mature worm.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cercaria" in a variety of sentences. We hope that you will now be able to make sentences using this word.
