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Reproductive Strategies in Annelida: Germ Cell Formation and Regeneration

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Reproductive and Developmental Strategies

Part of the book series: Diversity and Commonality in Animals ((DCA))

Abstract

 Annelida are metameric, eucoelomate bilaterian worms belonging to Lophotrochozoa, which is a major group of protostomes. This phylum includes Polychaeta, Oligochaeta, Hirudinea (leeches), and Archiannelida, and it is an important link in the evolution of body plan, regeneration, and reproduction. Although annelids generally reproduce sexually, many species can switch to asexual reproduction, proliferating exponentially, as seen in planarians, hydras, and some other lower invertebrates. Asexual reproduction is achieved through dedifferentiation and through stem cells regeneration, instead of being based on germ cells as in the case of sexual reproduction. Thus, studies on regeneration mechanisms and germ cells are essential for understanding annelid reproduction. In this chapter, Annelida’s reproduction and germ cell formation and regeneration are reviewed. Based on our research on the oligochaete Enchytraeus japonensis, a unique process of germ cell regeneration during asexual reproduction is proposed.

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Acknowledgement

We would like to thank Editage (www.editage.jp) for English language editing.

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  1. Department of Zoology, Graduate School of Science, Kyoto University, Kyoto, Japan

    Ryosuke Tadokoro

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  1. Ryosuke Tadokoro
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  1. Department of Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Japan

    Kazuya Kobayashi

  2. Department of Biological Sciences, Graduate School of Science and Technology Kumamoto University, Kumamoto, Japan

    Takeshi Kitano

  3. Laboratory of Reproductive Developmental Biology, Division of Earth Sciences, Biology, and Chemistry, Graduate School of Sciences and Technology for Innovation Yamaguchi University, Yamaguchi, Japan

    Yasuhiro Iwao

  4. Misaki Marine Biological Station, Graduate School of Science The University of Tokyo, Miura, Japan

    Mariko Kondo

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Tadokoro, R. (2018). Reproductive Strategies in Annelida: Germ Cell Formation and Regeneration. In: Kobayashi, K., Kitano, T., Iwao, Y., Kondo, M. (eds) Reproductive and Developmental Strategies. Diversity and Commonality in Animals. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56609-0_10

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