ヨウジウオ科魚類の無毬腎とその発生

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1. In addition to eight aglomerular fishes in Japan reported in previous papers (Ogawa, '57 and '58), six more teleosts, Acentronura gracilissima, Trachyrhamphus punctatus, Corythoichthys fasciatus, Doryrhamphus extensus, Ichthyocampus erythraeus (in Japan) and Syngnathus griseolineatus (in North America), were confirmed to have no glomerulus in their kidney structures. In Hippocampus kuda, aglomerular kidney was also confirmed again. In the embryos of Hippocampus coronatus, H.mohnikei, Acentronura gracilissima and Syngnathus griseolineatru, the structure of prenephros and the development of mesonephros were also sbserved. 2.In these fishes, the nephron is composed of only both the second portion of theproximal convoluted sedgment and the collecting duct, and there is no glomerulus in the kidney. These structures of nephron are almost similar to those of other aglomerular kidney. The lumen of the nephron in these fishes seems relatively larger (r/R=0.34-0.46) than that in other marine fishes except in Acentronura gracilissima and Ichthyocampus erythraeus. 3. The pronephros in the observed embryo of Syngnathida ends blind and develops neither pronephric chamber nor pronephric glomerulus. In the embryo of Hippocampus coronatus (10-11mm), the developmentof mesonephros was investigated, but also no glomerulus was found. 4. In Syngnathida there is only one postcardinal vien, the right, as has already been noted by other investigators. The kidneys are also developed around the right postcardinal vien and in the embryo of Hippocampus coronatus the left pronephric duct turns sharply to the right at the anterior portion of it. 5. In these embryos, both of the pronephros and the mesonephros are aglomerular from early stages of their developments. Therefore, it is highly probable that all fishes of Syngnathidaare aglomerular, because no fish has glomerular pronephros and mesonephros.
社団法人日本動物学会の論文
1961-10-15

ヨウジウオ科魚類の無毬腎とその発生

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