ヤママユガの幼虫皮膚の超微形態

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タイトル別名
  • Ultrastructure of the integument of the Japanese tusser, Antheraea yamamai GUERIN-MENEVILLE (Lepidoptera; Saturniidae).
  • ヤママユガ ノ ヨウチュウ ヒフ ノ チョウ ビ ケイタイ

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The ultrastructure of the integument of 3rd-instar gluttonous larvae and 4th-instar newly exuviated larvae of a Japanese tusser (Antheraea yamamai) was compared and the following results were obtained. The 4th-instar larvae showed a higher development of microvilli, invagination and intracellular organs (especially Golgi apparatus and rough-surfaced endoplasmic reticulum), indicating a remarkably active cuticularization at this instar stage. Light granules (1.0 to 1.5μm) were observed in cytoplasm of the dermal cells the distribution density of these granules was clearly higher in the 4th-instar larvae than in the 3rd-instar larvae and the substrate of these granules in the 4th-instar larvae consained fibrous materials, thus revealing differences between the two larvae stages. In addition to such granules, a cisterna containing a large number of vesicles was observed at the base of each microvillus in the case of the 4th-instar larvae. A stage-dependent difference in the thickness of the cuticle was observed. In the 4th-instar larvae in particular, a process of wrinkling which appeared to be closely related to the growth-associated cuticularization was observed on the surface of the cuticle. Pore canals were clearly detected only in the endocuticular portion.

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