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 A B Fig. 331.—Calliphora erythrocephala. A, sagittal section of anterior end. B, sagittal section of posterior end. {am) Amnion, {am. cav) Amniotic cavity, {ect) Ectoderm. {ent) Entoderm, {mes) Mesoderm, {proct) Proctodaeum. {stom) Stomodaeum. coele (body cavity) and of the separation of the mesoderm into the splanchnic and somatic layer. Somewhat later the somatic layer differ- entiate
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 A B Fig. 331.—Calliphora erythrocephala. A, sagittal section of anterior end. B, sagittal section of posterior end. {am) Amnion, {am. cav) Amniotic cavity, {ect) Ectoderm. {ent) Entoderm, {mes) Mesoderm, {proct) Proctodaeum. {stom) Stomodaeum. coele (body cavity) and of the separation of the mesoderm into the splanchnic and somatic layer. Somewhat later the somatic layer differ- entiates into numerous somatic muscles. The differentiation of the muscles of the mid-gut into transverse and longitudinal fibers occurs in a very late stage of the embryo or possibly even during postembryonic development in the Muscoidea, as is the case also in some other insects. Before the time when head and tail ends lie closest together, the proctodaeal invagination appears at right angles to the amniotic cavity and parallel to the longitudinal axis of the egg. Some of the early
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