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Biol Bull 155: 150-160. (August 1978)
© 1978 Marine Biological Laboratory
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INDUCTION OF THE WRINKLED BLASTULA FORMATION IN THE STARFISH, ASTERINA PECTINIFERA, BY MODIFIED DEVELOPMENTAL CONDITIONS

YOSHITAKA KOBAYAKAWA 1 and NORIYUKI SATOH 1

1 Department of Zoology, Faculty of Science, Kyoto University, Kyoto 606, Japan

1. The occurrence of the wrinkled blastula in the starfish, Asterina pectinifera, was examined. The ratios were different, from 10 to 90%, among batches. The wrinkled blastula stage is not always an inevitable process during the embryonic development of this species.

2. Low osmotic sea water (both natural and artificial sea water) remarkably increased the ratio of wrinkled blastula, while modified salinity, temperature, pH and Ca++, Mg++ SO4- concentrations of sea water gave no effect on the ratio. The induced wrinkled blastula developed into normal bipinnaria larva.






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Copyright © 1978 by the Marine Biological Laboratory.