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Reproduction and development of the sabellid polychaete myxicola infundibulum



Reproduction and development of the sabellid polychaete myxicola infundibulum



Journal of the Marine Biological Association of the United Kingdom 67(2): 431-440



The sabellid polychaete Myxicola infundibulum (Renier) was spawned in the laboratory in all months between July and February. Adults often spawned naturally within 48-72 h after collection and being placed in laboratory tanks. By subjecting worms to a cyclical raising and lowering of seawater temperatures, adults were also induced to release gametes. Fertilized eggs measured 136-138 .mu.m in diameter. Trochophores were formed after about 8 h and metatrochophores after about 24 h. Setigerous larvae developed as early as 6 days after fertilization; metamorphosis occurred between 10 and 15 days when the fourth setigerous segment was formed. Features which occurred only after metamorphosis included formation of the branchial plume, movement of the anus from a dorsal ventral position and development of the ciliated faecal groove. Progeny from a previous laboratory spawning were induced to spawn when they reached 26 months of age. Normal development ensued.

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Accession: 006315388

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DOI: 10.1017/s0025315400026710


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