腺带刺沙蚕的早期发育

A STUDY ON THE EARLY DEVELOPMENT OF NEANTHES GLANDICINCTA

１９８３年７—１２月于室内进行了腺带刺沙蚕Ｎｅａｎｔｈｅｓｇｌａｎｄｉｃｉｎｃｔａ人工授精、孵化及幼体培养观察．该种沙蚕在性成熟时没有异沙蚕型出现。水温在１３．０—２９．３℃范围内，沙蚕均能完成胚胎发育和幼体发育。担轮幼虫期在膜内渡过，五刚节疣足幼虫开始摄食，七剧节疣足幼虫开始钻砂，沙蚕幼虫体节在２０节之前体节与体长呈明显的直线正相关。

This paper presents the observative results of embryonic and larval development of Neanthes glandicincta (Southern 1921).This animal is more abundantly distributed in the Zhanjiang region of South China Sea. During the whole year,mature individuals can be found in Zhanjiang coast. Artificial fertilization and larval cultivation was performed at 13. 0-29. 3℃ (water temperature) in the laboratory. The sequence of the embryonic and larval development at 25. 0-29. 3℃(water temperature) is summarized as follows:Time after fertilization stages2 hr. 5 min. 2-cell stage;2 hr. 34 min. 4-cell stage;3 hr. 48 min. 8-cell stage; 16 hr. Blastula stage;29 hr. Gastrula stage;43 hr. Trochophore larval58 hr. Metatrochophore larval;77 hr. 3-larval setigers (hatch);97 hr. 5-larval setigers:128 hr. 6-larval setigers ;148 hr. 7-larval setigers; 183 hr. 8-larval setigers;252 hr. 10-larval setigers ;306 hr. 15-larval setigers;450 hr. 23-larval setigers.