Bull. Goshoura Cret. Mus.

1715-20
2016
No.17, 15-20, March, 2016.

3Nassarius festivus

4(1866-0313(24310-5 )371-0002(3800 )

464-8601(4D2-2 )901-03541528 )Molecular phylogenetic study of Nassarius festivus in East Asia
Yoshito Kandori 1, Ken Sakata 2, Seiji Hayashi 3, Hirofumi Kubo 4( 1 Goshoura Cretaceous Museum, 4310-5 Goshoura, Goshoura Town, Amakusa City, Kumamoto 866-0313, Japan )( 2 Maebashi Higashi Highschool, 800 Egi Town, Maebashi City, Gunma 371-0002, Japan )( 3 Graduate School of Environmental Studies, Nagoya University, D2-2 Furo Town, Chikusa-ku, Nagoya City, Aichi
464-8601, Japan )( 4 Okinawa Prefectural Fisheries Research and Extension Center, 1528 Kyan, Itoman City, Okinawa 901-0354, Japan )Abstract
Nassarius festivus (Nassariidae: Gastropoda) is the most common marine scavenger with an extensive range throughout
the East and Southeast Asia. Recent studies on genetic variation of nassariid gastropods in China have revealed two
divergent lineages within this species; however, little is known about its phylogeographic structure and demographichistory. To address this point more extensively, we performed a molecular phylogenetic analysis by combining our
newly sequenced mitochondrial COI gene fragment in 180 individuals (from mainland Japan, Okinawa and China) withpublished data (239 individuals in total). The results revealed two distinct clusters: one lineage comprised individuals
restricted to China (A) and the other comprised individuals from mainland Japan and Okinawa, with a small number ofChinese individuals (B). Large genetic differences were observed between these two divergent clusters because of aprobable split of the ancestral population between China and Japan. Sporadical existence of Chinese individuals incluster B may represent post-vicariant dispersal from Japan to China. Most Okinawa individuals were present in theperipheral part of cluster B, indicating that they represent a stochastically introduced population from mainland Japan,
possibly via coastal China.
Keywords: Nassarius festivus, mitochondrial DNA, COI, Japan, China

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(Philippi, 1844)

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sequencer (Applied Biosystems)
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