Two New Species of <i>Hemiliostraca</i> (Caenogastropoda: Eulimidae) from Japan and Taiwan

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  • 日本および台湾から採集されたクテンハナゴウナ属（新生腹足上目ハナゴウナ科）の2新種
  • Two New Species of Hemiliostraca (Caenogastropoda: Eulimidae) from Japan and Taiwan

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Description

Two new species of the eulimid genus Hemiliostraca Pilsbry, 1918 are described based on specimens recently collected and on some preserved in museum collections: Hemiliostraca fasciata n. sp. from Japan and H. ophiarachnicola n. sp. from Japan and Taiwan. Hemiliostraca fasciata n. sp. has hitherto been identified as Eulima vincta, Subularia vincta or H. vincta in literature and museum collections, but it differs from the syntypes of Leiostraca vincta A. Adams, 1863, which were newly examined for the present study, in possessing non-colored apical whorls, three lines on the body whorl in dorsal view, a slender aperture, a relatively larger body whorl, and a flattened columella. Hemiliostraca ophiarachnicola n. sp. has often been misidentified as H. distorta in museum collections, but it can be distinguished from latter species by a combination of characters, such as the more slender earlier whorls, three lines on the body whorl in ventral view, the non-convex teleoconch whorls, and the evenly protruding outer lip margin. Hemiliostraca ophiarachnicola n. sp. was found attached to the ophiuroid Ophiarachna incrassata by its proboscis, and is the second Hemiliostraca species described from ophiuroids.

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