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《Chinese Journal of Zoology》 1993-06
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A RESEARCH ON THE EMBRYONIC DEVELOPMENT SHAPE OF MOINA ICRASA

ZHENG Youxiong (Dept.of Biol.,Qufu Normal Univ.Shandong Prov 273165)  
Under the condition of constant temperature in the laboratory,the eggs and the embryonic development of Moina icrasa are observed.The research shows that the eggs of M.i- crasa are equal cleavage and have the characteristic of spiral egg cleavage.There are four rough stages in the process of M.icrasa's embryonic development and each one consists of more detailed stages. The eggs of M.icrasa and the time needed by their embryonic development have close rela- tionship with temprature.The respective necessant times on 10℃,20℃.30℃ are 150 hours,47 hours and 23.5 hours.The present essay deals with the shape-characteristic of the eggs of the M.icrasa.
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