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Journal of Molluscan Studies 2008 74(4):309-316; doi:10.1093/mollus/eyn022
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© The Author 2008. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

A new species of Pyropelta (Gastropoda: Pyropeltidae) from hydrothermal vents in the Okinawa Trough, southwestern Japan

Takenori Sasaki1, Takashi Okutani2 and Katsunori Fujikura2

1 The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; and 2 Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka 237-0061, Japan

Correspondence: T. Sasaki; e-mail: sasaki{at}um.u-tokyo.ac.jp


  Abstract

A new species of the genus Pyropelta (Pyropeltidae) was collected from hydrothermal vents in the Okinawa Trough, Japan. The generic assignment is confirmed by shell, radular morphology and several anatomical characters of the animal. Comparison of shell microstructural characters with other molluscs revealed possible new diagnostic characters of Pyropelta: (1) an irregular laminate sculpture associated with multiple insertion of thin prismatic sublayers, (2) a thick myostracum attaining whole shell thickness, (3) microtubules penetrating the myostracum completely and (4) internal position of shell growth front. At species level, P. ryukyuensis n. sp. is distinguished from other Pyropelta species by eight characters of the shell, shell microstructure and radula.

(Received 19 June 2007; accepted 1 May 2008)


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