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 TYPE OF EMBRYONIC DEVELOPMENT IN INSECTS 15 Gradually appendages appear on the segments, the antennae arising pos- torally but later migrating forward. In front of the stomodaeal opening which has formed in the first segment is the labrum. The hypopharynx which develops from the fusion of two small elevations near the median line behind the stomodaeum belongs to the intercalary segmen
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 TYPE OF EMBRYONIC DEVELOPMENT IN INSECTS 15 Gradually appendages appear on the segments, the antennae arising pos- torally but later migrating forward. In front of the stomodaeal opening which has formed in the first segment is the labrum. The hypopharynx which develops from the fusion of two small elevations near the median line behind the stomodaeum belongs to the intercalary segment; the basal coel neur neurg Fig. 16.—Cross section of embryo, (am) Amnion, (coel) Coelomic cavities, (ect) Ectoderm, (mes) Mesoderm, (mst) Median nerve strand, (neur) Neuroblasts, (neurg) Neural groove. part of the hypopharynx, however, is formed from the sternal regions of the jaw segments. The jaws and the legs at first appear as short, broad elevations (Fig. 15). The second maxillae later fuse along the median line to form the labium. As development proceeds, the appendages become segmented. On the first abdominal segment they are glandular embrvonic structures (pleuropodia). mds
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