无齿相手蟹的幼体发育

The complete larval development of Sesarma dehaani

无齿相手蟹的幼体发育经过４个■状幼体和１个大眼幼体期。在水温２５～２６℃、盐度１５、光照度２００～３００Ｌｘ的条件下，从第一期■状幼体出膜到大眼幼体出现历时１２ｄ；大眼幼体至第一期幼蟹出现为４～５ｄ。作者观察的无齿相手蟹各期幼体的形态与Ｂａｂａ所描述的有些不同，尤其是各期■状幼体第１，２颚足的刚毛数本文结果均分别为不变的１０根和４根，且按２、２、３、３和１、１、１、１有规律的排列。本文还对相手蟹属的幼体形态特征进行讨论和简要总结。

The complete larval development of Sesarma dehaani H. Milne-Edwards reared in the laboratory is described and illustrated in detail. The present species passes through four zoeal stages before metamorphosis to the megalopal stage. The megalopa was attained about 12 days after hatching. The culture was carried out at 25 -26℃, saltinity of 15 and photo intensity 200 - 300Lx. Differences between the author' s and the Baba' s in the zoeal and magalopal stages of this species are tabulated. The setae numbers of first maxilliped and second maxilliped in each zoea stage are invaviably 10 and 4 respeclively. And their setation is regularly arranged as 2.2.3.3 and 1.1.1.1. Morphological features of the zoea and maglopa of Sesarma generec are briefly discussed.