. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. A B Fig. 43.—Sagittal section of embryo. Development of the mid-gut epithelium, (am) Amnion, {ect) Ectoderm, (mes) Mesoderm, (mge) Mid-gut epithelial rudiment: (a) anterior, (p) posterior, (proct) Proctodaeum. (rb) Mid-gut epithelial ribbon, {stom) Stomodaeum. strand, coming back to Rabl's idea of the inner layer being composed of a median entoderm band and paired mesoderm bands. Kowalewsky has
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. A B Fig. 43.—Sagittal section of embryo. Development of the mid-gut epithelium, (am) Amnion, {ect) Ectoderm, (mes) Mesoderm, (mge) Mid-gut epithelial rudiment: (a) anterior, (p) posterior, (proct) Proctodaeum. (rb) Mid-gut epithelial ribbon, {stom) Stomodaeum. strand, coming back to Rabl's idea of the inner layer being composed of a median entoderm band and paired mesoderm bands. Kowalewsky has compared the formation of the germ bands in insects with their formation in Sagitta where the archenteron becomes divided by the appearance of two folds into a median enteric rudiment and two lateral coelomic sacs (Fig. 40). The views of Grassi and Kowalewsky were later accepted by Wheeler, Cholodkowsky, and others. A number of writers, on the other hand, following Heymons (1895o) maintained that the mid-gut epithelial rudiments arose from the blind ends of the stomodaeum and proctodaeum in the Orthoptera and some other orders. They came to the conclusion that the functional mesen- teron of pterygote insects is of recent origin and that the original entoderm. 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 Johannsen, O. A. (Oskar Augustus), 1870-1961; Butt, Ferdinand Hinckley, 1899-. New York, London, McGraw-Hill Book Company, inc.
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, bookleafnumber87
