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 OLIGONEPHRIDIA 251 absorbed. The inner entodermal tube derived from the vesicles now undergoes disintegration, leaving as the definitive mid-gut epithelium {mge) the cells originating from the middle entodermal mass. Since the nutritive mass is so small in this viviparous psocid, addi- tional food material is obtained through a pseudovitellus in a manner mge stom mes Fig. 172
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 OLIGONEPHRIDIA 251 absorbed. The inner entodermal tube derived from the vesicles now undergoes disintegration, leaving as the definitive mid-gut epithelium {mge) the cells originating from the middle entodermal mass. Since the nutritive mass is so small in this viviparous psocid, addi- tional food material is obtained through a pseudovitellus in a manner mge stom mes Fig. 172.—Archipsocus. Sagittal section of anterior part of mid-gut enclosing inner entodermal vesicle {ent. ves) at anterior end. (br) Brain, (mes) Mesoderm, (mge) Definitive mid-gut epithelium, {nc) Nerve cord, (stom) Stomodaeum. similar to viviparous (ovoviviparous) aphids. Fine cytoplasmic proc- esses pass from the cells of the serosa into the walls of the ovarian tubule wherever the embryo comes in contact with it. In the posterior region the wall of the ovarian tubule is unusually thick, the boundary between it and the serosa (Fig. 173, ser. ovt) being obliterated. It is here that proct
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