Kubota, S. & T. Horita, 1995. Life cycle of Bougainvillia bitentaculata (Hydrozoa: Anthomedusae) in Japan. Publ. Seto Mar. Biol. Lab. 36 5/6: 351-363.

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Publication

The life cycle of Bougainvillia bitentaculata in Japan is described. The morphology and the cnidome of the hydroid and the t-day-old immature medusa are described together with egg size, spawning time, and seasonal occurrence of medusa for the first time. A marked morphological change appeared in the laboratory-reared medusae of both sexes, especially in the number of tentacles, i.e. up to eight marginal tentacles are produced in a tentacular bulb and one of the four oral tentacles branched up to five times. As described previously, usually two marginal tentacles are present in a tentacular bulb of the medusa collected in the sea, but sometimes three and rarely four tentacles were also observed during the present study.

Cycles, Saisonality, Phenology

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