Holland, "Arboreal Tadpoles," Amer.
Tadpoles are aquatic vertebrates.
In describing tadpoles, the term "body" is therefore used as meaning head and body.
Once there were eleven tadpoles in a glass globe set in a window full of plants.
The above description applies to all European and North American tadpoles, and to the great majority of those known from the tropics.
Some tadpoles reach a very great size.
It was great fun to plunge my hand into the bowl and feel the tadpoles frisk about, and to let them slip and slide between my fingers.
In addition to these lines, all tadpoles show more or less distinctly a small whitish gland in the middle of the head between the eyes, the so-called frontal gland or pineal gland, which in early stages is connected with the brain.
The atrium is thus analogous to the opercular cavity of fishes and tadpoles, and, as stated above, remains in communication with the exterior by means of the atriopore.
In others, which represent the perichordal type, the greater share of the formation of the whole vertebra falls to the (paired) dorsal cartilage, but there is in addition a narrow ventral or hypochordal cartilage which fuses with the dorsal or becomes connected with it by calcified tissue; the notochord is thus completely surrounded by a thick sheath in tadpoles with imperfectly developed limbs.
Tadpoles transported from one place to another.- Dendrobates, Phyllobates, Sooglossus.
The tadpoles grow to a large size considering that of the adult, the body equalling in size a sparrow's or even a small pigeon's egg, and they often remain more than a year in that condition.
The creek flowed over a succession of rock ledges and formed pools at the edge where tadpoles swam.
This orifice is the spiraculum, which is lateral, on the left side of the body, in most tadpoles, but median, on the breast or belly, in those of the Discoglossidae and of some of the Engystomatidae.
In some Indian and Malay Engystomatids of the genera Callula and Microhyla, the tadpoles are remarkably transparent, and differ markedly in the structure of the buccal apparatus.
Among European forms, some tadpoles of Pelobates attain a length of seven inches, the body being of the size of a hen's egg.