Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 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
Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 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
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