. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). S3 500 INVERTEBRATE MORPHOLOGY. differ greater cliauges result, leading to hemimetahoUsm. This; occurs, for iustauce, iu the Fish-flies (Ephenieridse) aud Dragou-llies {Lihelhda), in which the larva) are adapted for au aquatic life and possess tracheal brauchiie (Ephemeridse) aud other features which are lost, either gradually by successive moults or suddenly at the last moult, the adult winged Dragon- fly, for instance, issuing from a peculiar aquatic larva with the me
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). S3 500 INVERTEBRATE MORPHOLOGY. differ greater cliauges result, leading to hemimetahoUsm. This; occurs, for iustauce, iu the Fish-flies (Ephenieridse) aud Dragou-llies {Lihelhda), in which the larva) are adapted for au aquatic life and possess tracheal brauchiie (Ephemeridse) aud other features which are lost, either gradually by successive moults or suddenly at the last moult, the adult winged Dragon- fly, for instance, issuing from a peculiar aquatic larva with the merest rudiments ol wings. Finally, a large number of forms are hohmetaholic. In such cases the habits of the larva3 are different from those of the adults; for instance, the larvje of the Butterflies, Wu^ caterpillars (Fig. 231), are wornilike creatures with power-. mpmmmmm Fio. 231.—Lauva, ri:i>A, and uv I'lcris oleracea (ivom Riley), ful jaws feeding ou plant-tissues, while in the adults the mouth- parts are adapted for sucking. The transformation from the larva to the adult is accomplished by the intervention of a resting stage or pupa, dur-ng which no uutiition is taken, ami when the transformation takes place the )}i('(l insect or imago issues from the ru])tured skin of the ))ii)ia. The pupa varies considerably in form in different grou]).s, in some being enclosed in a silken case manufactured by the larva before the last moult and termed a cocoon. In some cases the adult apjiendages project from the bpdy of the pupa (pupa JiberaX but iu other cases they are united with the surface of the body and but indistinctly visible {pupa ohtecta), au arrangement usually found in the Buttor- flies, whose pnpjo, owing to their frequent brilliant coIoim- tion, are termed chrysaluh. a term which lias been somewhat incorrectly extended to the mummy-like puptr of other Please note that these images are extracted from scanned page images that may have been
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
