File:Outlines of zoology (1916) (14597319858).jpg

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Identifier: cu31924003404161 (find matches)
Title: Outlines of zoology
Year: 1916 (1910s)
Authors: Thomson, J. Arthur (John Arthur), 1861-1933
Subjects: Zoology
Publisher: New York, Appleton
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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of structure, as inthe burrowing forelegs of the larva. Moreover, the larvaacquires the characters of an adult after a quiescent periodof pupation. The differences between larva and adult are more strikingin may-flies, dragon-flies, and the related Plecoptera (e.g.Perld), for in these the larvae are aquatic, with closedrespiratory apertures, and with tracheal gills or folds, whilethe adults are winged and aerial, and breathe by opentrachese. These insects are called hemimetabolic, i.e. they have apartial or incomplete metamorphosis. (3) Very different is the life history of all other sets ofInsects—ant-lions, caddis-flies, flies, fleas, butterflies andmoths, beetles, ants, and bees. From the egg there ishatched a larva (maggot, grub, or caterpillar), which lives alife very different from the adult, and is altogether unlikeit in form. The larva feeds voraciously, grows, rests, andmoults. Having accumulated a rich store of reservematerial in its fatty body, it finally becomes for some
Text Appearing After Image:
Fig. 185.—Life histories of Insects.p. and A., larva, pupa, and adult respectively of water-beetle (DyHscus marginalia); I; A, «•, larva^ pupa, and_adult of blue-bol;tle fly (Mxsca , larva, pupa, and adult of Cossus ligniperda. 23 3S4 PHYLUM ARTHROPODA. time quiescent, as a pupa, nymph, or chrysalis, often withinthe shelter of a cocoon. During this period there are greattransformations; wings bud out, appendages of the adultpattern are formed, reconstruction of other organs iseffected. Finally, out of the pupal husk emerges aminiature winged insect of the adult or imago type. These insects are called holometabolic, i.e. they exhibit acomplete metamorphosis. Two kinds of larvae occur among insects, (a) In manyametabolic and hemimetabolic forms the larva is somewhatlike one of the lowly Thysanuran insects (Oampodea), and is

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Flickr tags
InfoField
  • bookid:cu31924003404161
  • bookyear:1916
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Thomson__J__Arthur__John_Arthur___1861_1933
  • booksubject:Zoology
  • bookpublisher:New_York__Appleton
  • bookcontributor:Cornell_University_Library
  • booksponsor:MSN
  • bookleafnumber:378
  • bookcollection:cornell
  • bookcollection:biodiversity
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
30 July 2014

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