. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 167.—Archipsocus. Ovuminovar- Fig. 168.—Archipsocus. Sagittal sec- iole {ovt). ipr) Periplasm, {trc) Tropho- tion. (bid) Dorsal blastoderm, (ent) An- cyte. iy) Yolk. terior (a) and posterior (p) entoderm rudiments, (gb) Germ band, (gc) Germ cells, {trc) Trophocyte. measures microns in length, has neither yolk nor chorion and entirely fills the ovarian tubule in which it lies. As the egg trav
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. Fig. 167.—Archipsocus. Ovuminovar- Fig. 168.—Archipsocus. Sagittal sec- iole {ovt). ipr) Periplasm, {trc) Tropho- tion. (bid) Dorsal blastoderm, (ent) An- cyte. iy) Yolk. terior (a) and posterior (p) entoderm rudiments, (gb) Germ band, (gc) Germ cells, {trc) Trophocyte. measures microns in length, has neither yolk nor chorion and entirely fills the ovarian tubule in which it lies. As the egg travels down the ovarian tubule, cleavage begins. The first division results in the produc- tion of two nuclei, which come to He in the center of the egg, embedded in the central cytoplasm. When about six nuclei (blastomeres) are pro- duced, they are found embedded in the periplasm (Fig. 167), with two nuclei surrounded by cytoplasm, remaining in the center and giving rise to the vitellophags (trc trophocytes). The egg now elongates, the periph- 248. 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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