Halcrow K
Cell Tissue Res. 1976 Jun 14;169(2):267-76. doi: 10.1007/BF00214213.
The structure of the two integumental layers comprising the carapace of female D. magna was examined at several points through the molt cycle. The epicuticle and procuticle are simple in organisation; pore canalsare absent but intracuticular fibres are present, forming complexes with invaginations of the epidermal plasma membrane similar to such complexes described in the literature for othe arthropods. The epidermis consist almost entirely of cuticle-secreting cells. Secretion of the new cuticle begins when 50-67% of the instar has elapsed by which time the epidermal cells have increased in height and their nuclei have become more rounded. However, other presumed secretory phenomena observed viz. the formation of dense core vesicles by Golgi bodies, and the occurrence of these and coated vesicles near the apical plasma membrane are not restricted to any particular period during the molt cycle. This suggests that the mechanisms of cuticle secretion do not undergo marked changes in activity as they do in decapods; presumably this relative continunity is related to the much shorter molt cycle of cladocerans.
在蜕皮周期的几个时间点，对雌性大型溞背甲的两层体壁结构进行了检查。上表皮和原表皮组织结构简单；没有孔道，但有表皮内纤维，与表皮质膜内陷形成复合体，类似于文献中描述的其他节肢动物的此类复合体。表皮几乎完全由分泌角质层的细胞组成。当龄期过去50%-67%时，新角质层的分泌开始，此时表皮细胞高度增加，细胞核变得更圆。然而，观察到的其他推测的分泌现象，即高尔基体形成致密核心囊泡，以及这些囊泡和包被囊泡出现在顶端质膜附近，并不局限于蜕皮周期的任何特定时期。这表明，角质层分泌机制的活性不像十足目动物那样发生显著变化；据推测，这种相对的连续性与枝角类动物短得多的蜕皮周期有关。
