STAGES IN THE DEVELOPMENT OF THE EMBRYO OF THE FRESH-WATER CRAYFISH CHERAX-DESTRUCTOR
STAGES IN THE DEVELOPMENT OF THE EMBRYO OF THE FRESH-WATER CRAYFISH CHERAX-DESTRUCTOR
复制标题
DOI：
10.1007/bf02457638
复制
发表时间：
1991-01-01
期刊：
影响因子：
--
通讯作者：
SANDEMAN, D
中科院分区：
文献类型：
--
作者：
SANDEMAN, R;SANDEMAN, D
小龙虾胚胎的发育是按顺序阶段描述的，间隔代表从受精到孵化所需总时间的 5%，在 19 摄氏度下为 40 天。通过透明绒毛膜可以清楚地观察到早期细胞分裂、胚盘细胞聚集到腹板、原肠胚形成和胚胎的形成，并且使用形态学标准表征每个阶段。孵化时，卵绒毛膜裂开，但幼体（胚胎后第一阶段）通过从尾部延伸的膜仍然附着在卵内部。 7至8天后，幼体蜕皮，进入第二个胚胎后阶段。它脱离了鸡蛋，仍然粘在母亲身上。 14天后，第二个胚胎后阶段蜕皮，产生未成熟的成虫。
Development of the crayfish embryo is described in sequential stages separated by intervals that represent 5% of the total time taken from fertilization to hatching, which is 40 days at 19-degrees-C. Early cell division, aggregation of blastoderm cells into the ventral plate, gastrulation and formation of the embryo can be clearly observed through the transparent chorion and each stage characterised using morphological criteria. At hatching the egg chorion splits open but the hatchling (postembryo stage I) remains attached to the inside of the egg by membranes extending from its tail. 7 to 8 days later the hatchling moults to produce the 2nd postembryonic stage. Free from the egg, it still clings to the mother. 14 days later the 2nd postembryonic stage moults to produce the immature adult.