中文摘要：

对蒙古裸腹溞Moina mongolica的胚胎发育过程和两种裸腹溞（蒙古裸腹溞和多刺裸腹溞Moina macrocopo）滋养盘形态进行了详细观察，描述了胚胎各发育期的形态特征和发育速度。在水温为（28±0．5）℃时，蒙古裸腹溞从亲体中产出（第一幼龄）到有卵母细胞排到孵育囊整个发育时间共经历了43～44h，从卵排入孵育囊开始到发育成幼溞（若虫，neonate）排出体外，共经历了（39．33±1．01）h。该溞的胚胎发育过程可划分为卵裂期（A）、多细胞期（B）、“T”型胚胎期（C）、触角原基期（D）、胸肢原基期（E）、2复眼期（F）、复眼重合期（G）和离开母体期（H）共8个期。蒙古裸腹溞和多刺裸腹溞都有滋养盘，二者的滋养盘存在着一定的差异。

英文摘要：

The embryonic development of Moina mongolica Daday and morphology of the nutritive organs in two species Moina were observed. The morphological characteristics and development rate in all development stages were described by means of microscopy or electron microscopy. It took 43 -44 h for the whole development durations from first larval instar to egg reoccurrence in brood chamber; （39.33 ±1.01 ）h for the durations from eggs of brood chamber to neonate expel from matrix at water temperature of （28 ± 0.5）℃. The development of M. mongolica can be divided into 8 phases： A （cleavage stage）, B（ many celled）, C（formation of ＂T＂ type embryo）, D（ formation of antenna anlage）, E （formation of pereiopod anlage）, F（ formation of 2 - compound eye）,G（single compound eye stage） and H（ expel from matrix）. Both M. mongolica and M. macrocopa had nutritive organs which were different in morphology.