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A Population Without Females: Males of Baseodiscus delineatus (Nemertea: Heteronemertea) Reproduce Asexually by Fragmentation
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- Jumpei Ikenaga
- Misaki Marine Biological Station, The University of Tokyo, Koajiro 1024, Misaki, Miura, Kanagawa 238-0225, Japan
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- Natsumi Hookabe
- Graduate School of Science, Hokkaido University, N10E8 Kita-ku, Sapporo, Hokkaido 060-0180, Japan
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- Hisanori Kohtsuka
- Misaki Marine Biological Station, The University of Tokyo, Koajiro 1024, Misaki, Miura, Kanagawa 238-0225, Japan
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- Manabu Yoshida
- Misaki Marine Biological Station, The University of Tokyo, Koajiro 1024, Misaki, Miura, Kanagawa 238-0225, Japan
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- Hiroshi Kajihara
- Faculty of Science, Hokkaido University, N10E8 Kita-ku, Sapporo, Hokkaido 060-0180, Japan
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Description
The valenciniid heteronemertean Baseodiscus delineatus (Delle Chiaje, 1825) was originally described from Naples, Italy, and shows a circumglobal distribution from tropical to temperate seas in both hemispheres. To investigate its reproductive biology, we performed intermittent year-round sampling from 2014 to 2018 in Misaki on the Pacific coast of Honshu, Japan. Of the 40 specimens obtained, 11 were males, while 29 were immature. No female specimen was confirmed during the sampling period. We additionally observed that B. delineatus is fissiparous. A male individual in captivity reproduced asexually by spontaneous posterior fragmentation, an ability that is described here for the first time among Valenciniidae. Autotomy occurred every 2–10 days, with each of the tail fragments having undergone anterior regeneration, which took about 24–36 days before completion of internal organs, such as ocelli, cerebral organs, brain, alimentary canal, rhynchocoel, and proboscis. A review of the literature suggests that the species was absent in the Misaki region 120 years ago. We assume a recent settlement of a male founder, which has putatively reproduced asexually to yield a clonal, unisexual population in Misaki.
Journal
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- Zoological Science
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Zoological Science 36 (4), 348-, 2019-08-01
Zoological Society of Japan
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Details 詳細情報について
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- CRID
- 1360004238332511360
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- NII Article ID
- 210000186773
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- DOI
- 10.2108/zs180203
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- ISSN
- 02890003
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- Article Type
- journal article
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- Data Source
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- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
