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The genetic structure of the marine flatworm Stylochoplana pusilla (Rhabditophora: Polycladida) and its use of intertidal snails

Published online by Cambridge University Press:  15 July 2020

Daishi Yamazaki Open the ORCID record for Daishi Yamazaki [Opens in a new window] ,
Tomoki Aota  and
Satoshi Chiba
Daishi Yamazaki*
Affiliation:
Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai, Miyagi, 980-8576, Japan
Tomoki Aota
Affiliation:
Department of Ecology and Evolutionary Biology, Graduate School of Life Science, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi980-8578, Japan
Satoshi Chiba
Affiliation:
Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai, Miyagi, 980-8576, Japan Department of Ecology and Evolutionary Biology, Graduate School of Life Science, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi980-8578, Japan
*
Author for correspondence: Daishi Yamazaki, E-mail: zaki.daishi@gmail.com
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Abstract

Although marine phylogeographers have accumulated knowledge of the evolutionary history of various invertebrates, there is a large bias among the taxa regarding genetic data. The order Polycladida is a typical example for which little genetic information at population level is available. Here, we focused on the polyclad flatworm Stylochoplana pusilla, distributed in the Japanese Pacific coastal area. Stylochoplana pusilla is known to have commensal relationships with certain intertidal snails, using snails (mainly Monodonta confusa) as a refugee house. During low tide, S. pusilla hides in the mantle cavity of snails to protect themselves from desiccation and predation. Here, we investigated the genetic structure of S. pusilla using a mitochondrial Cytochrome Oxidase I marker and the species diversity of snails used by it. We found that S. pusilla has high genetic diversity of its populations. While S. pusilla showed a significant genetic differentiation among populations, it was relatively low. In addition, we also showed that S. pusilla used several intertidal snail species which inhabit various coastal environments. The present study suggests S. pusilla has sufficient dispersal ability to connect among its local populations. Also, the range of available snails for S. pusilla may help the connectivity among local populations. We provide important knowledge about this invertebrate taxon with a unique ecology, which has been insufficiently studied.

Keywords

Cytochrome Oxidase Igenetic structuremarine flatwormPolycladidaRhabditophora
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 5 , August 2020 , pp. 713 - 717
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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