Genus-specific commensalism of the galeommatoid bivalve Koreamya arcuata (A. Adams, 1856) associated with lingulid brachiopods

Molluscan Research 31(2): 95-105; published 28 Jul. 2011
Copyright © The Malacological Society of Australasia & the Society for the Study of Molluscan Diversity

Genus-specific commensalism of the galeommatoid bivalve Koreamya arcuata (A. Adams, 1856) associated with lingulid brachiopods

SHIN'ICHI SATO¹, MASATO OWADA², TAKUMA HAGA³, JAE-SANG HONG⁴, Jørgen Lützen⁵ & HIROYOSHI YAMASHITA⁶

^{1The
Tohoku University Museum, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578,
Japan.

Corresponding author - Email: kurosato@m.tohoku.ac.jp.

^{2Department of Biological Sciences, Kanagawa University, 2946
Tsuchiya, Hiratsuka 259-1293, Japan
^{3 Marine Biodiversity Research Program, Institute of
Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC),
2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
^{4Department of Oceanography, Inha University, Incheon
402-751, South Korea
^{5 Section of Marine Biology, Biological Institute, University
of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark
^{6Association of Conservation Malacology, 3-1-26-103
Kugenuma-Mastugaoka, Fujisawa 251-0038, Japan}}}}}Abstract

We compared
shell morphology and DNA sequences of the ectosymbiotic bivalves Koreamya
(Montacutidae) attached to two different species of inarticulate
brachiopods Lingula collected from South Korea. There are some
differences in shell morphology between K. arcuata (A.
Adams, 1856) attached to Lingula anatina and K. sp.
attached to L. adamsi, such as shell outline, periostracum and
hinge teeth. However, there are very few differences in DNA
sequences of COI and ITS1 suggesting that the two forms of Koreamya
are genetically conspecific. While many ectosymbiotic Galeommatoidea
species have been reported to live commensally with only one host
species, this study suggested that K. arcuata lives
commensally with at least two species of Lingula and that its
shell morphology may vary according to the host species.
Key
words:
Galeommatoid bivalve, Ectosymbiosis, Lingula, Mitochondrial COI
gene, Montacutidae, Nuclear ITS, Shell morphology, South Korea

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