Development of the Seastar, Astropecten gisselbrechti Doderlein
| dc.contributor.author | Komatsu, Mieko | |
| dc.contributor.author | Nojima, Satoshi | |
| dc.date.accessioned | 2008-03-22T23:44:18Z | |
| dc.date.available | 2008-03-22T23:44:18Z | |
| dc.date.issued | 1985-07 | |
| dc.description.abstract | The entire process of development from eggs to juveniles in the seastar Astropecten gisselbrechti was observed, with special attention to the external morphology and formation of the skeletal system . The breeding season of this seastar along the coast of Tsuyazaki (33°47' N, 130°28' E), Fukuoka Prefecture, Japan, is in June. The eggs are 353 /lm average diameter, semitranslucent, and pale brown in color. Development proceeded as follows at 25°C: Embryos develop through a wrinkled blastula stage that lasts about 5 hr (from 5 hr after insemination) by total and equal cleavage. Gastrulae bearing an expanded distal portion of the archenteron hatch from the fertilization membrane 15hr after insemination. Gastrulae develop into barrel-shaped larvae 11 days after insemination. The larva is free-swimming, and is neither bipinnaria nor brachiolaria because it lacks an open larval mouth, arms , and ciliary bands. Rudiments of the adult skeletal plates appear at this time. Metamorphosis is completed 4 days after insemination, mostly by absorption of the stalk, a larval organ, or rarely by rupture of the stalk. The newly metamorphosed juvenile is 650 /lm in diameter and bears two pairs of tube-feet on each arm . This is the third reported observation of a barrel-shaped larva in asteroids. | |
| dc.identifier.citation | Komatsu M, Nojima S. 1985. Development of the seastar, Astropeten gisselbrechti Doderlein. Pac Sci 39(3): 274-282. | |
| dc.identifier.issn | 0030-8870 | |
| dc.identifier.uri | http://hdl.handle.net/10125/932 | |
| dc.language.iso | en-US | |
| dc.publisher | University of Hawai'i Press | |
| dc.title | Development of the Seastar, Astropecten gisselbrechti Doderlein | |
| dc.type | Article | |
| dc.type.dcmi | Text |