Evagination of the amniotic cavity in larvae derived from lithium-treated embryos of a direct developing echinoid,Peronella japonica
✍ Scribed by Kitazawa, Chisato; Amemiya, Shonan
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 122 KB
- Volume
- 279
- Category
- Article
- ISSN
- 0022-104X
No coin nor oath required. For personal study only.
✦ Synopsis
The effect of LiCl on the development of the sand dollar, Peronella japonica, a direct developer, was examined. Embryos treated with LiCl were vegetalized and exogastrulated, as reported for species showing indirect development. In addition, lithium treatment of Peronella embryos resulted in evagination of the amniotic cavity. Larvae whose amniotic cavity was evaginated did not complete the adult rudiment, but formed the adult skeletal system. The ratio of larvae with an evaginated amniotic cavity was not correlated with the concentration of LiCl enployed. The present results suggest that treatment of echinoid embryos with LiCl causes evagination of invaginating tissues as well as vegetalization.