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 8G.—Isotoma. Sagittal section of posterior end. (abd) Abdominal appendages. igc) Germ cells, (il) Inner layer, (prod) Proctodaeum. found in the sixth segment, and indicated only by the apparent presence of ephemeral neuroblasts in the fifth segment. The head (Figs. 85, 87, ) and thoracic ganglia are well developed; of the three brain segments the tritocerebrum is smallest and posto
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 8G.—Isotoma. Sagittal section of posterior end. (abd) Abdominal appendages. igc) Germ cells, (il) Inner layer, (prod) Proctodaeum. found in the sixth segment, and indicated only by the apparent presence of ephemeral neuroblasts in the fifth segment. The head (Figs. 85, 87, ) and thoracic ganglia are well developed; of the three brain segments the tritocerebrum is smallest and postoral in position. The germ cells, stem Fig. 87.~Isotoma. Half of cross section through labial seg- ment, (ggl) Ganglion, (hg) Tubu- lar head gland, (lb) Labium. {palp) Labial palp. Fig. 88.—Isotoma. Oblique section through mandibles, (am. ser) Amnioserosa. (67-) Brain, (md) Mandible, (si) (stem) Stomodaeum. though increased in number at this stage, are still in the yolk near the posterior part of the embryo (Fig. 86).
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