外部観察によるモンカゲロウ Ephemera strigata Eaton の胚子発生
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In this brief paper, outline of the embryonic development of Ephemera strigata Eaton (Ephemeridae, Ephemeroptera), as studied by external observation supplemented with that of sections, is described. A single egg is ovoid in shape and measures 0.25mm.×0.15mm. The eggs were kept at 17°-19℃. in our laboratory and hatching occurred 8-9 days after oviposition. The type of embryonic development of E. strigata is an invaginated one and much resembles that of Odonata. But the abdomen of the former is much longer than that of the latter, so that, in the later stages, the embryo of E. strigata shows complicated external features. The blastoderm completion occurs about 20 hours, the ventral plate differentiation at the posterior pole of the egg about 23 hours, and invagination of the ventral plate into the yolk about 28 hours after ovipostion. In the stages of anatrepsis, i. e. about 28-90 hours after oviposition, the segmentation of the germ-band is completed, rudiments of the appendages of the head, the thorax and the abdomen are formed. The inner layer, stomodaeum, proctodaeum and cuticular envelop appear also in this stage. About 91 hours after oviposition, katatrepsis occurs and revolution of the embryo results in its reorientation in the egg with its head directed anteriorly. Dorsal closure is completed about 125 hours after oviposition, as a result of which the second dorsal organ becomes differentiated. About 156 hours after oviposition, the embryo almost attains its final stage and begins to move in the egg. The rudiments of compound eyes, ocelli, and tracheal trunks are clearly seen in this stage. The embryo hatches out about 204-216 hours after ovipostion. The newly hatched nymph measures 0.97mm. in length, excluding antennae and tails. In the second instar nymph (280 hours after ovipostion), the most important change has taken place in the abdomen, i. e. paired gills begin to appear on segments III-VII.
- 日本昆虫学会の論文
- 1956-10-01
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