Archive image from page 401 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( 344 THE DEVELOPMENT OF THE NYMPH. 3. THE DEVELOPMENT OF THE IMAGO FROM THE NYMPH. From the fifth day of the pupa state to the escape of the imago. The development of the nymph, as already stated, may be regarded as complete when the pupa sheath is
Archive image from page 401 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( 344 THE DEVELOPMENT OF THE NYMPH. 3. THE DEVELOPMENT OF THE IMAGO FROM THE NYMPH. From the fifth day of the pupa state to the escape of the imago. The development of the nymph, as already stated, may be regarded as complete when the pupa sheath is separated from the subjacent cellular layer. From this period until the imago emerges from the pupa, the process of development may be conveniently divided, as Weismann [2] suggested, into two stages. The first commences on the fifth day, and terminates Fig. 47.—A section through the .iljdominal integument of a nymph from a pupa seven clays old: e f, outer celKilar layer of small epiblast cells ; /(, inner cellular layer of hypoderm and trichogenic cells. The cuticular layers are developed l)etween the outer and inner cells. about the end of the seventh. During this period the external form of the nymph undergoes rapid evolution, and by the end of the seventh day differs but little from that of the young imago when it is ready to escape from the pupa-shell. The integumental setae are developed from the large trichogenic cells, and the small cells of the epiblast between them increase in number so rapidly that the whole integument becomes minutely corrugated, the great seta; arising from the ridges. The hollows of the rugae are occupied by minute setie which
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Keywords: 1890, archive, blowflies, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_pub_for_the_author_by_r_h_porter, lowne_benjamin_thompson_1839_, page, picture, print, reference, vintage
