The Southernmost Record of Nipponacmea fuscoviridis (Patellogastropoda: Lottiidae) from Iriomote Island, Okinawa

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  • 沖縄県西表島から採集されたクサイロアオガイの南限新記録

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Nipponacmea fuscoviridis (Teramachi, 1949) is enormously abundant in the intertidal zone throughout the temperate area of the Japanese islands (southern Hokkaido and southward: Sasaki & Okutani, 1993). It also occurs in part of the Ryukyu Islands, but known subtropical localities are extremely few in number. In the literature, reliable records exist only from four of the Nansei Islands, viz. Amami-Oshima Island, Kakeroma Island, Tokashiki Island and Kunigami, Okinawa Island (Sasaki & Okutani, 1993; Kubo & Kurozumi, 1995). In 2004 one of us (T. S.) surveyed the molluscan fauna of Iriomote Island, Okinawa (Sasaki et al, 2006) and unexpectedly collected specimens of the genus Nipponacmea, which is mainly distributed in temperate areas. As a result of morphological examinations they were identified as N. fuscoviridis based on shell characters, animal pigmentation and radular sac configuration. In addition, molecular phylogenetic analysis confirmed that the material is genetically conspecific with temperate population of N. fuscoviridis. We report this interesting range extension in this paper.

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