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Title: 退化しないクラゲ口柄基部より走根を伸張しポリプに若返ったベニクラゲ(ヒドロ虫綱, 花クラゲ目)の成熟雄
Other Titles: Reversion of a mature male medusa of Turritopsis nutricula (Hydrozoa, Anthomedusae) to the polyp stage by extension of a stolon from the base of its undegenerated manubrium
Authors: 久保田, 信  kyouindb  KAKEN_id
Author's alias: Kubota, Shin
Keywords: Hydromedusa
life cycle reversion
sexual reproduction
Issue Date: 20-Dec-2005
Publisher: 日本生物地理学会
Journal title: 日本生物地理学会会報
Volume: 60
Start page: 31
End page: 34
Abstract: A mature male medusa (small morphotype) of Turritopsis nutricula McCrady collected on 18 August 2005 from Tanabe Bay, Wakayama Prefecture, Japan, transformed to the young polyp stage after partial degeneration of the medusa body, by extension of stolons from the base of the undegenerated manubrium, which retains the ability to engulf and digest food (Anemia nauplii). Such a reversion, retaining part of the old body (the manubrium) attached to the new body (the polyp colony), is the first such example known in the life cycle of this species. Before undergoing this transformation, the male medusa had fertilized the ovum of a simultaneously collected mature female medusa cultured together with it, and a planula was produced. This male thus led a dual life, not only reverting to the youthful stage of the same genotype, but also producing an offsprng of a different genotype.
Rights: © 2005 日本生物地理学会
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