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 TRICHOPTERA AND LEPIDOPTERA 349 the proctodaeum (Fig. 306A) is as long as the stomodaeum but with larger lumen. The Malpighian tubes arise at its tip, three on each side; and as they develop, they extend parallel and caudad for about three- fourths of its length. Though origi- nating from a pair of invaginations in the same manner as described by Schwartze (1899) for Lasiocampa, the sho
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 TRICHOPTERA AND LEPIDOPTERA 349 the proctodaeum (Fig. 306A) is as long as the stomodaeum but with larger lumen. The Malpighian tubes arise at its tip, three on each side; and as they develop, they extend parallel and caudad for about three- fourths of its length. Though origi- nating from a pair of invaginations in the same manner as described by Schwartze (1899) for Lasiocampa, the short basal stem is not evident in Diacrisia. The splanchnic, or vis- ceral, layers of the mesoderm from suboesb which the muscles of the mid-gut are formed are at this time visible as two longitudinal bands of cells extending from the labial head segment caudad to the origin of the Malpighian tubes (Figs. 3075, 308, splm). The mid- gut epithelial strands lie dorsad of the splanchnic mesodermal strands. At 82 hours the closing membrane of the stomodaeum has spread out cup-shaped (Fig. 310). The continuity of this membrane with the mid- am sfom Fig. 309.—Diacrisia. section of stomodaeum of 77-hour embryo. ilim. m) Limiting membrane, (mge) Mid-gut epithelial ribbon, (suboesb) Sub- esophageal body, (y) Yolk.
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