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The neritid Clithon retropictum (v. Martens, 1870) is listed as a second-grade endangered mollusk species inKorea, inhabiting river mouths and estuaries on the south coast and Jeju Island. C. retropictum has been identifiedfrom four localities on Jeju Island, two on the north and the other two on the south coasts. Recent surveys on thenorthern coast of Jeju Island indicated that a small population of C. retropictum inhabits the river mouth ofGosung-Cheon stream located near Hagwi fishing port on the northern Jeju Island. In the newly found locality, weidentify several adult sizes of C. retropictum and the numerous egg capsules attached to rocks. Accordingly, wereport the new habitat of the estuarine gastropod on the northern coast of Jeju Island.
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