The greater part of these reptiles undergo a transition from a fish-like tadpole furnished with gills to a four-legged animal with lungs.
In shape it is the most uncouth and unsightly of the piscatory tribe, resembling the frog in its tadpole state.
When each of the pits has received its egg, the orifice becomes closed by a sort of lid, and the young animal goes through all its changes from the tadpole to the perfect Toad in this rather confined space.
The tadpole of Hyla robertsorum, with comments on the affinities of the species.
The Ascaphus tadpole bears no outward resemblance to the larva of Leiopelma, but is a normal tadpole in form, although sluggish in activity.
Its greatly expanded labial folds bear numerous rows of horny epidermal "teeth," which, with the lips, serve to anchor the tadpole to stones in the swift water of mountain brooks.
Some light may be shed on the significance of the tadpole of Anura by considering the early stages of the ribbed frogs, Liopelmidae.
Upper left, late tadpole of Xenopus laevis; lower left, same just after metamorphosis; upper right, diagram of general components of primitive Anuran vertebra.
Shortly after the tadpole wriggles out of the jellylike case and begins life outside the egg.
At first it remains attached to some water weed by means of a pair of suckerlike projections; later a mouth is formed, and the tadpole begins to feed upon algae or other tiny water plants.
In late July or early August, the tadpolebegins to eat less, the tail becomes smaller (being absorbed into other parts of the body), and before long the transformation from the tadpole to the young frog is complete.
If the web of the foot of a live frog or the tail of a tadpole is examined under the compound microscope, a network of blood vessels will be seen.
As the tadpolegrows larger, legs appear, the hind legs first, although for a time locomotion is performed by means of the tail.
I dropped into the brook alone, and there I quietly passed through my novitiate, egg to tadpole, tadpole to toadling, toadling to toad.
The bourgeois and the proletarian who come into the Socialist movement both have tadpole tails to lose in the course of their development into scientific socialists; but the tails are different.
It is only mentioned here because mention of it was necessary to illustrate the most curious case I know of the abnormally prolonged retention of the utopian tadpole tail.
That is because, when I wrote that, I had not fully gotten rid of my idealistic tadpole tail.
I do not wish to be understood as speaking with contempt or depreciation of the tadpole tails.
Just at this point we are often met with two queries, both of which bear witness to the persistence of the utopian tadpole tails of the questioners.
That is because he has not yet gotten rid of his tadpole tail.
What a mad idea, many will say, that man should at one time be a tadpole like the frog!
In the northern area, from Fontaine-notre-Dame to Tadpole Copse, the German attack was not launched until some two hours later.
During the afternoon the enemy also attacked our positions at Tadpole Copse, but was repulsed.
Moeuvres and Tadpole Copse, and made some progress.
The largest tadpole examined is in stage 38 and has a total length of 29.
The largest tadpole examined is in stage 40 and has a total length of 34.
The little tadpoleswam away as far as he could and tugged and tugged at the line.
The way Father Frog demanded Pinkie Whiskers to drop the tadpole made him very determined not to do so.
He is my little tadpole now and I am going to take him home and fry him for my breakfast.
I am going to take my tadpole home with me anyway.
I want to stay here and I will stay here," said the tadpole and he jumped about so lively that Pinkie Whiskers had all he could do to keep from falling off the stone.
Once more he pulled the tadpole free from the water and slipped the net under it.
Someway he had not thought about a tadpole having a voice or being able to talk.
Pinkie Whiskers looked at Father Frog and when he saw how big he was, felt rather small and timid himself, but he raised up to his full height and said: "Is this little tadpole your son?
He just jumped against Pinkie Whiskers with such force that the rod flew out of his hand and the little tadpole went flop back into his watery home.
The little tadpole paid no heed to Pinkie Whiskers' demand.
At last the tadpole found his voice and said, "Oh, please put me back in the water.
You are the little tadpole I have been fishing for," he cried.
He was very much frightened for he knew that the tadpole could not get up onto the rocks himself and yet the call for help came from the rocks.
She was rocking a small tadpole to sleep in this way one day, when the disguised Prince came hobbling along, and asked for a bit to eat.
Illustration: She was rocking a small tadpole to sleep.
Fish-like in form it was then, as well as in habit; it was a tadpole with a long compressed muscular tail, and with external gills of several branches, but as destitute of lungs as it was of limbs.
At about the forty-second day the tadpole begins to assume the form of an adult Newt.
About the twenty-second day the tadpole for the first time begins to emit air from the mouth, showing that the lungs have begun to be developed.
The body of the tadpole is oval in shape, and terminates in a long flat tail, which forms a true fin; on each side of the neck are two large gills, in shape like a plume of feathers; the tadpole has no legs.
The tadpole no longer feeds on decomposing substances, and cannot live long immersed in water.
These gills soon begin to wither, without aquatic respiration ceasing, however; for, besides these, the tadpole possesses interior gills like fishes.
After extrication, the tadpole grows rapidly, and the chief change of form is witnessed in the gills.
The growth of the tadpoleis summarized in Table 10.
They considered the Pioneers exhibited signs of swollen head, and nicknamed their society the 'Tadpole Club,' declaring its members to be still in that elementary stage of their development.
Though the seniors might be scornful, indignant, or otherwise hostile towards the Tadpole Club, it certainly had the effect of increasing their own efforts and making them keep up their standards.
It has already been shewn that from the dorsal and lateral portions of this section of the primitive alimentary tract the notochord and muscles of the Ascidian tadpole are derived.
The mouth and anal perforations are not long in making their appearance, and thetadpole is then able to feed.
It has a striking resemblance to a tadpole (vide fig.
As the tail of the Tadpole gradually disappears, and the metamorphosis into the Frog becomes accomplished, the mandibular arch undergoes important changes (fig.
It may be noted that the same difficulty is involved in supposing, as I have done, that the eye of the Ascidian Tadpole was developed from that of a Vertebrate.
The long alimentary canal becomes shortened, and the, in the main, herbivorous Tadpole gradually becomes converted into the carnivorous Frog (fig.
The similarity of the mouth and other parts of Petromyzon to those of the Tadpole probably indicates that there existed a common ancestral form for the Cyclostomata and Amphibia.
Various features in the anatomy of the Tadpole point to its being a repetition of a primitive vertebrate type.
The change undergone by the Tadpole in its passage into the Frog is so considerable as to deserve the name of a metamorphosis.
Of what advantage to the tadpole was the smooth outline of its body, and why is the rougher outline of the toad's body better suited for the life of the latter?
From the dark area of the egg the tadpole develops, the dark colour absorbs the sunlight, and this causes growth.
Why is the mouth of the toad better suited to its manner of life than the small mouth of the tadpole would be?
What is the use of the dark colour of the area from which the tadpole is formed?
What movements has the toad which the tadpole did not have?
The tadpole is very small, and external gills are needed to keep it in very close contact with the water.
The last and most conspicuous change, however, from the gill-bearing and tailed tadpole to the air-breathing and tailless frog, hardly belongs to the ordinary period of embryonic development.
When the tadpole has four limbs and a long tail it has already reached the point at which the more primitive Amphibia (Menopoma, Proteus, &c.
It is by a secondary adult metamorphosis that the aquatic tadpole turns into the land-traversing frog.
They are oviparous, hatched by the heat of the sun from eggs, covered with a soft, glutinous membrane, which the mother had laid in the water, and develop throughtadpole stages.
I am only telling you a small portion of its history here; a history you must know, which reveals a miracle still more wonderful than the transformation of the little tadpole into the frog!
Presently the two hind feet begin to bud out and grow, little by little; then the fore feet; finally, the tail wastes away till it disappears; and thus insensibly the tadpole is transformed into a frog.
I found a tadpole in an advanced stage of transmutation, Miss Palliser, and it has almost converted me to Darwinism.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tadpole" in a variety of sentences. We hope that you will now be able to make sentences using this word.
