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Latitudinal shift of the associated hosts in Sagamiscintilla thalassemicola (Galeommatoidea: Galeommatidae), a rare ectosymbiotic bivalve that lives on the proboscis of echiuran worms

Published online by Cambridge University Press:  06 December 2023

Ryutaro Goto Open the ORCID record for Ryutaro Goto [Opens in a new window] ,
Taigi Sato ,
Hiroki Nakajima ,
Takahiro Sugiyama  and
Hiroshi Ishikawa
Ryutaro Goto*
Affiliation:
Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, 459 Shirahama, Nishimuro, Wakayama 649-2211, Japan
Taigi Sato
Affiliation:
Graduate School of Engineering and Science, University of the Ryukyus, 1 Sembaru, Nishihara, Nakagami, Okinawa 903-0213, Japan
Hiroki Nakajima
Affiliation:
Graduate School of Engineering and Science, University of the Ryukyus, 1 Sembaru, Nishihara, Nakagami, Okinawa 903-0213, Japan
Takahiro Sugiyama
Affiliation:
Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, 459 Shirahama, Nishimuro, Wakayama 649-2211, Japan
Hiroshi Ishikawa
Affiliation:
7-7-10 Yunoyama, Matsuyama, Ehime 791-0121, Japan
*
Corresponding author: Ryutaro Goto; Email: gotoryutaro@gmail.com
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Abstract

Sagamiscintilla thalassemicola (Bivalvia: Galeommatoidea: Galeommatidae) is a rare ectocommensal bivalve that lives on the proboscis of echiuran worms, Anelassorhynchus spp. (Annelida: Thalassematidae: Thalassematinae: Thalassematini), and has been known only from the temperate zones of Japan. In this study, we found S. thalassemicola on the proboscis of the large echiuran Ochetostoma sp. (Thalassematidae: Thalassematinae: Thalassematini) on intertidal flats of three islands of the Ryukyu Archipelago, southern Japan. These are the first records of S. thalassemicola on non-Anelassorhynchus hosts and also from the subtropical regions. Additionally, we also collected S. thalassemicola from an intertidal flat of Kushimoto, Wakayama, Kii Peninsula, Japan, which is an update of the easternmost record of this species. The genetic differences in the mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 2 genes among S. thalassemicola, including those with Ochetostoma sp. from the subtropical region and with Anelassorhynchus spp. from the temperate region, can be considered within the intraspecific variation. These suggest that S. thalassemicola uses different echiuran hosts in the temperate and subtropical regions, respectively.

Keywords

commensalismEchiuraGaleommatoideageographic variationhost shifthost specificitylatitude
Type
Marine Record
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 103 , 2023 , e94
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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