ヒルガタワムシの飼育觀察

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The common rotifer, Philodina roseola, upon observation of the species, can be kept alive in watch glass as long as sixty-six days -generally forty-fivedays on the average-on unicellular alga, Chlorella ellipsoidea. The fully grown animal, when extended, measures from 0.35 to 0.40mm in length, and newly hatched young, about 0.12mm. The body tint is usually colorless or gray, but sometimes pink, regardless of the color of food intaken. This is somewhat in contrast to American speies, where it has been determined that the redish color appears to result from food alga, Spaehrclla lacustris. The external cuticle is distinctly thicker in the trunk than elsewhere, and this portion stains well with a diluted solution of methylene blue. However, contrary to JACOBS' observation, a positive, instead of negative, phototropism is frequently observed, except in the aged animals. The animal begins to lay parthenogenetic eggs three or four days after hatching and while still in the growing stage, and lay from one or two and sometimes three or four eggs in a day. The total number of eggs from a single female, over her lifetime, is about forty on the average. From the very beginnig, the behavior of the young is very similar to that of the adult. Even when placed in redistilled water, the animal can live without food and the life apan is shortened somewhat from that of normal life, but the young grows considerably slower, and egglaying is delayed from eight to sixteen days after hatching, and only three to eighy eggs are produced in one generation. The eggs, however, hatch two or three days as in normal environment. In an experiment using redistilled water, one egg was found to hatch within the body cavity of the mother.
社団法人日本動物学会の論文
1952-07-15

ヒルガタワムシの飼育觀察

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