カワムラハデミナシ(イモガイ科)は現生種か絶滅種か?

DOI 機関リポジトリ 機関リポジトリ (HANDLE) オープンアクセス

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  • Leptoconus kawamurai Habe, 1962 (Gastropoda: Conidae) is a living or extinct species ?

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Leptoconus kawamurai Habe, 1962 is a western Pacific conid species closely related to Leptoconus milneedwardsi (Jousseaume, 1894) living in off Mozambique to Mauritius, Arabian Sea and Bay of Bengal. Abundant dead shells of L. Kawamurai were reported from the shallow sea around Amami to Okinawa Islands. However, neither living individual nor soft-body material has been obtained. Moreover, the tented pattern on the shell surface is pale (or yellowish tan in color) compared with that of L. milneedwardsi. A radiocarbon age of a well-preserved dead shell from off Itoman City, Okinawa-jima was measured with a Tandetron accelerator mass spectrometer (AMS) at the Dating and Materials Research Center, Nagoya University. The ^<14>C dating indicates 292±66yrBP (NUTA-4301). This suggests that L. kawamurai is a extinct species (or subspecies) which disappeared from the Amami and Okinawa Islands at Little Ice Age in 16th to 19th century.

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