Relationship between the Number of Annuli of Adult Antenna and the Length of Embryonic and larval Period in Samia cynthia ricini
スポンサーリンク
概要
- 論文の詳細を見る
In the eri-silkworm, Samia cynthia ricini, the adult antennal flagellum is segmented into many annuli. Although the number of annuli is an important parameter in the morphogenesis of adult antenna, it is not clear when and how the number of annuli is determined. In the present study the fifth instar larva of the eri-silkworm was studied histologically to clarify when the antennal imaginal disk began morphogenesis and when the number of annuli of adult antennal flagellum was determined. In addition we studied whether the length of the embryonic and larval period might have any influence on the number of annuli in the eri-silkworm, and the influence of other factors such as body size and sex was also examined. Serial histological study of the imaginal disk during the larval period suggested that the number of annuli was determined by the second day after gut-purging, since the segmentation of the pupal antenna was almost finished by this time and the number of segments of pupal antenna was nearly equal to the number of annuli of adult antenna. The embryonic and larval period was closely related with the number of annuli. When the insects were reared at 25℃, the number of annuli was almost equal to the number of the days in which the insects passed from oviposition to gut-purging. In addition, the number of annuli tended to increase one by one from 27 to 34 as the embryonic and larval period was extended day by day from 28 to 35 days. When the insects were reared at 18℃, the larval period was doubled, whereas the number of annuli remained in the same range (28-34) as that reared at 25℃. The body size did not correlate with the number of annuli. Although the number of annuli was significantly larger in female than in male, this difference seemed to be due to the difference in the length of the embryonic and larval period in both sexes.
- 社団法人日本動物学会の論文
著者
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Yasuda K
Nara‐women's Univ. Nara Jpn
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Yasuda Keiko
Department Of Biological Science Faculty Of Science Nara Women's University
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Takahashi Sohji
Department of Biological Science, Faculty of Science, Nara Women's University
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Takahashi Sohji
Department Of Biological Science Faculty Of Science Nara Women's University
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Takahashi Shoji
Department of Biological Science, Faculty of Science, Nara Women's University
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