. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Ej. ORTHOPrEHA WalKm^ sticks HEMIPTKH* Bed buj^ OS ON ATA. LAHVAL STAGES f-lOLOMETABOLOUS DEVELOPMENT Fig. 279. Diagram representing the principal stages and processes involved in the development of hemimetabolous and of holometabolous differentiated. In the hemimetabolous insects, such as the orthopterans (grass- hoppers, cockroaches, walking sticks, etc.), the hemipterans (bedbugs, Rhod- nixis, etc.), and Odonata, the transition from larval to adult condition is typ- ically a gradual one, in which th
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Ej. ORTHOPrEHA WalKm^ sticks HEMIPTKH* Bed buj^ OS ON ATA. LAHVAL STAGES f-lOLOMETABOLOUS DEVELOPMENT Fig. 279. Diagram representing the principal stages and processes involved in the development of hemimetabolous and of holometabolous differentiated. In the hemimetabolous insects, such as the orthopterans (grass- hoppers, cockroaches, walking sticks, etc.), the hemipterans (bedbugs, Rhod- nixis, etc.), and Odonata, the transition from larval to adult condition is typ- ically a gradual one, in which the developing young, typically known as nymphs, in succeeding molts come graduallv to resemble more and more nearly the adult. In such hemimetabolous insects, however, the last nymphal molt is usually associated with by far the most striking transformation and hence is commonly -considered the metamorphic moit. In holometabolous in- sects, such as the Lepidoptera (moths, biflterflies, etc.), Diptera (Droso- phila, blowflies, etc.), and Coleoptera, ^'ery little change of form in the di- rection of the adult occurs during the larval series of molts, these being primarily growth changes, but the last larval molt is associated with the formation of a pupa. During the pupal stage the larval organism becomes completely transformed into an adult, a spectacular metamorphosis. There is no fundamental difference between the two foregoing types of development, the observed difl^erences being primarily the result of differences in the times at which the processes of imaginal differentiation occur. These latter are extended to a considerable extent over the whole larval period in the. 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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