Embryonic Development of the Hair Crab Erimacrus Isenbeckii
Embryonic Development of the Hair Crab Erimacrus Isenbeckii
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毛蟹胚胎发育
DOI：
10.1163/193724099x00277
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发表时间：
1999
影响因子：
1.1
通讯作者：
K. Shimazaki
中科院分区：
文献类型：
--
作者：
H. Munehara;K. Shimazaki
摘要 观察了实验室饲养的毛蟹胚胎的外部形态变化。根据形态变化将胚胎发育分为9个阶段：卵裂前阶段、卵裂和囊胚阶段、原肠胚阶段、无节幼体阶段、后无节幼体阶段、色素眼阶段、心跳启动阶段、幼体前期和孵化前阶段。雌性在一月份产下的胚胎在三月份发育到原肠胚阶段。另一位雌性的胚胎从原肠胚阶段发育到孵化前阶段，从3月到12月，并在1月孵化。这些结果表明实验室条件下的潜伏期约为12个月。由于二月份收集的一只雌性仍携带幼虫前期胚胎，因此实验室中的胚胎生长速度预计将高于现场。认为孵化期的长短受多种环境因素影响，但胚胎生长速度主要受水温控制。因此，在收集研究样本的北海道周围，孵化雌性可能分布在比实验室温度更低的地方。
ABSTRACT External morphological changes in embryos of the hair crab Erimacrus isenbeckii (Brandt) reared in the laboratory were observed. Embryonic development was divided into 9 stages based on morphological changes: precleavage stage, cleavage and blastula stage, gastrula stage, naupliar stage, metanaupliar stage, pigmented-eye stage, heartbeat-initiation stage, prezoea stage, and prehatching stage. Embryos spawned by a female in January developed to the gastrula stage by March. Embryos from another female developed from the gastrula stage to the prehatching stage from March to December, and hatched in January. These results suggest that the incubation period under laboratory conditions was about 12 months. Since one female collected in February still carried prezoea-stage embryos, the embryonic growth rate in the laboratory was expected to be higher than in the field. It is thought that the length of the incubation period is affected by many environmental factors, but the embryonic growth rate is mainly controlled by water temperature. Thus, around Hokkaido, where specimens studied were collected, incubating females may be distributed in temperatures cooler than in the laboratory.