. The transformations (or metamorphoses) of insects. Insects; Insects; Myriapoda; Arachnida; Crustacea. 48 TRANSFORMATIONS OF INSFCTS. do not always have spiracles, but they often breathe like fishes, by branchiae or gills. The imago or adult insect, which is pfoduced by metamor- phosis from the water larva and nymph, becomes an air breather —and spiracles are developed in its sides exactly in the places where the gills were attached during its iish-like life. In the larvae of the May flies the branchiae are formed of expansions of the skin, which are very delicate, thin, and variously folded
. The transformations (or metamorphoses) of insects. Insects; Insects; Myriapoda; Arachnida; Crustacea. 48 TRANSFORMATIONS OF INSFCTS. do not always have spiracles, but they often breathe like fishes, by branchiae or gills. The imago or adult insect, which is pfoduced by metamor- phosis from the water larva and nymph, becomes an air breather —and spiracles are developed in its sides exactly in the places where the gills were attached during its iish-like life. In the larvae of the May flies the branchiae are formed of expansions of the skin, which are very delicate, thin, and variously folded and fringed, and they are attached in pairs to the first seven seg-. THE AQUATIC LARVA AND NYMPH OF THE CADDIS FLY {Pkryganea flavicomis). ments of the abdomen. The tracheae are included in the folds and are continued into the body of the larva, and they transmit the purified air to it; but the gills disappear during metamorphosis. Some packets of filaments of thin tissue derived from the skin occupy the same position in the larvae and nymphs of caddis flies, and have the same function and fate as the branchiae of the May fly larvae. These branchiae are not found in all aquatic larvae, for many which do not become metamorphosed eventually into winged insects still continue to breathe air, although they live in the water. Such larvae coijie to the surface to breathe every now and then, and they do so by the means of their swimming. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duncan, P. Martin (Peter Martin), 1821-1891; Blanchard, Émile, 1819-1900. Metamorphoses . .. des insects. London and New York, Cassell, Petter, and Galpin
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Keywords: ., bookcentury1800, bookdecade1870, booksubjec, booksubjectcrustacea
