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 emb ser Fig. 177.—Pediculus. Sagittal sec- tion, {am) Amnion, {emb) Embryo. ientm) Ental membrane, {myct) Myce- tom. {ser) Serosa. Fig. 178.—Pediculus. Sagittal sec- tion of embryo during revolution, {am) Amnion. {entm) Ental membrane. {gl) Prothoracic gland shortly before degeneration, {myct) Mycetom. {ser) Serosa. lary segment. This is not in agreement with the interpretation of Fe
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 emb ser Fig. 177.—Pediculus. Sagittal sec- tion, {am) Amnion, {emb) Embryo. ientm) Ental membrane, {myct) Myce- tom. {ser) Serosa. Fig. 178.—Pediculus. Sagittal sec- tion of embryo during revolution, {am) Amnion. {entm) Ental membrane. {gl) Prothoracic gland shortly before degeneration, {myct) Mycetom. {ser) Serosa. lary segment. This is not in agreement with the interpretation of Fernando (1934). The germ band, which in the stage shown in Fig. 176 is attached to the serosa, becomes free (Fig. 177) by the time the segmentation is recogniz- able and the anlagen of the appendages appear. The amnion separates the germ band from the yolk on the ventral side. Dorsally it is separated from the yolk by a membrane that is fused with the posterior part of the head of the embryo and at the caudal end with the proximal part of the hind-gut (Fig. 177, entm). In cross section it appears that in the middle section of the body the amnion and the dorsal membrane ('ental mem- brane') just mentioned arise from the same lateral region of the germ band. Revolution of the embryo is initiated by a secondary fusion of the amnion with the serosa at the place where the original invagination
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