イラガの繭 : II. 繭の形成, とくに褐色条斑の発現について

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The larva of the Oriental moth, Monema (Cnidocampa) flavescens WALKER constructs a very hard cocoon shaped as a sparrow egg, and usually dark brown stripes run radially from the upper and/or bottom part on the surface of the cocoon. This characteristic pattern of stripes varies with the cocoons. The present experiments were undertaken to clarify the mechanism of appearance of the stripes on the surface of the cocoon under various conditions, and the results obtained were discussed in relation to the stripes occurring naturally in cocoons. A full-grown larva spins a thin silk cocoon surrounding the body. The silk cocoon is so small, about one half of the larva length, that the larva bends its body in the dorsal side in the cocoon during the construction of the cocoon. When the construction of the silk cocoon is completed, the larva excretes white muddy substances produced in the Malpighian tubes from the anus in the cocoon. These white muddy substances are plastered inside the wall of the silk cocoon by the pressure of the ventral side of the larva. In the larva, scoli are distributed on the subdorsal and the suprospiracular lines in a row respectively, and some of the scoli located in the 2,3,4,10,and 11th segments are extremely large and tend to protrude. It seems likely that the dark brown stripes appearing on the surface of the cocoon were not plastered with the white muddy substances due to obstruction by the protruding scoli, or the scraping off of the white muddy substances by the scoli during the construction of the cocoon. The chemical nature of the white muddy substances will be reported in succeeding papers.
日本応用動物昆虫学会の論文
1984-08-25

イラガの繭 : II. 繭の形成, とくに褐色条斑の発現について

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