The creek flowed over a succession of rock ledges and formed pools at the edge where tadpoles swam.
In describing tadpoles, the term "body" is therefore used as meaning head and body.
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.
Tadpoles are aquatic vertebrates.
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.
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