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 244 EMBRYOLOGY OF INSECTS AND MYRIAPODS tion (Fig. 166C,p?'ocf) in a manner similar to the stomodaeal invagination but at the caudal end of the body. It is first in evidence about 7 hours after the appearance of the stomodaeum. The six Malpighian tubules, of ectodermal origin, first appear in the 117-hour stage. The definitive mid-gut, according to Roonwal, arises from the ecto- derm, i

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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 244 EMBRYOLOGY OF INSECTS AND MYRIAPODS tion (Fig. 166C,p?'ocf) in a manner similar to the stomodaeal invagination but at the caudal end of the body. It is first in evidence about 7 hours after the appearance of the stomodaeum. The six Malpighian tubules, of ectodermal origin, first appear in the 117-hour stage. The definitive mid-gut, according to Roonwal, arises from the ecto- derm, , from a proliferating mass of cells that come from the ectodermal cells at the blind ends of the stomodaeal and proctodaeal invaginations. These masses become cup-shaped, the edges of the anterior growing toward the edges of the posterior cup until their edges meet, enclosing a part of the mid-gut yolk. The yolk, previous to this period, has become enclosed first by the provisional dorsal closure soon after blastokinesis and stom

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