イトミミズモドキの産卵観察法

概要

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The fresh water oligochaete, Tubifex hattai, shows negative response to ordinary light and, by this reason, it is difficult to carry out detailed observations on the ovipository behavior of the worm. In the present paper are described the results of experiments concerning the response of worms to various colors of light, the ability of a worm to lay cocoons in the solitary condition, and the importance of said for the normal formation of the cocoon at oviposition. (1) The worms exposed to the red light do not avoid it and deposit cocoons normally. (2) The worm kept separately for a month in a petri-dish containing sand repeatedly deposits a number of cocoons which contain developing eggs. (3) The worm reared in a petri-dish lacking sand deposits eggs without the formation of normal cocoons. The development of these eggs ceases at early cleavage stages. It was concluded from these results that the normal oviposition occurs in the worm which has been reared within a month in the laboratory and placed in the petri-dish containing a small amount of sand. The process is observable under red light illumination.
1965-09-15