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 180 EMBRYOLOGY OF INSECTS AND MYRIAPODS stomodaeum from the ventriculus, however, is not broken down until the .yolk is wholly absorbed. It may be observed that late in the develop- mental period a blue pigment forms in the ectoderm, a characteristic common to the adult also. This pigment is also present in both stomo- daeum and proctodaeum but absent in the cells of the ventriculus, an
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 180 EMBRYOLOGY OF INSECTS AND MYRIAPODS stomodaeum from the ventriculus, however, is not broken down until the .yolk is wholly absorbed. It may be observed that late in the develop- mental period a blue pigment forms in the ectoderm, a characteristic common to the adult also. This pigment is also present in both stomo- daeum and proctodaeum but absent in the cells of the ventriculus, an indication, perhaps, that the mid-section and the end sections of the alimentary canal have a different origin. There is no indication in Isotoma that the yolk cells play any part in the formation of the digestive epithelium. After 10 days' incubation the neuropile is first in evidence in the dorsal part of each ganglion with nerve cells surrounding it. The three-seg- am. ser
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