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Biol Bull 156: 20-30. (February 1979)
© 1979 Marine Biological Laboratory
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REPRODUCTION AND LARVAL DEVELOPMENT OF POLYDORA GIARDI MESNIL (POLYCHAETA: SPIONIDAE)

RANDY L. DAY 1 and JAMES A. BLAKE 1

1 Pacific Marine Station, University of the Pacific, Dillon Beach, California 94929

The larval development of Polydora giardi is described. Adults occur in burrows found in coralline algae and abalone shells. Sexes are separate. Females deposit eggs in hollow, cylindrical capsules attached to the wall of the tube by filaments. Larvae are released from capsules at the three-setiger stage. Planktonic development exceeds 25 days at 15° C. Larvae settle randomly on the surface of calcareous substrata and metamorphose in the presence of coralline algae. Only 8.3% of the population were sexually mature over a 6-month period from February through July. The larvae of P. giardi closely resemble those of P. flava, P. caeca, and P. concharum. This larval resemblance is also reflected in adult morphology.






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Copyright © 1979 by the Marine Biological Laboratory.