Pareuchaete russelli (FARRAN)のナウプリウス幼生の変態
1960 年 26 巻 8 号 p. 792-796
詳細
1960 年 26 巻 8 号 p. 792-796
1. Pareuchaeta russelli is one of the common species in the warm waters of Japan.
2. The eggs are carried in the egg-sac attached to the genital pore until they are hatched.
3. The subspherical egg of P. russelli is measured 0.29mm. in diameter. The number of eggs in one sac is usually about 20. The sac is thrown off after spawning and within 8 days the next batch may appear.
4. The eggs in sac and in ovary are bright bluish green in colour, but the red oil-globules give the embryo a reddish tinge at time they emerge.
5. It appears that P. russelli passes through its nauplius stages without feeding, because it has the plentiful supply of yolk to pass through its nauplius, stages.
6. There are six nauplius stages. The total durration of the nauplius stage was usually about 4 days.
7. 24-30 hours elapse before the final nauplius moults and develops into the Copepodite I, and this period appears to be most critical in the development.
