The anatomy of Cylindrotis quadrasi form Okinawa Island, Japan and the subfamilial position of the genus Cylindrotis möllendorff, 1895 (Archaeopulmonata: Ellobiidae)

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Abstract

Cylindrotis quadrasi Mollendorff, 1895, the type species of the ellobiid genus Cylindrotis, was collected from Okinawa Island, southwest Japan. This is the first record of C. quadrasi in Japan and the third in the world. The anatomical characters of this species, i.e. shell, head-foot, pallial cavity, radula, stomach, reproductive system, and central nervous system, are described in detail for the first time. The significance of these observations is discussed and the subfamilial position of Cylindrotis is reconsidered. Cylindrotis was included in the Pythiinae, the most primitive group of the Ellobiidae, based on the conchological characters alone. However, the male and female tracts of the reproductive system are entirely separated, and other internal organs exhibit highly derived conditions. Accordingly, Cylindrotis is transferred from the Pythiinae to the Ellobiinae. Among the genera of the latter subfamily, Cylindrotis seems to be allied to Blauneria Shuttleworth, 1854 and Lcucophytia Winckworth, 1949.

Original languageEnglish
Pages (from-to)69-81
Number of pages13
JournalJournal of Molluscan Studies
Volume60
Issue number1
DOIs
Publication statusPublished - Feb 1 1994
Externally publishedYes

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ASJC Scopus subject areas

  • Aquatic Science
  • Animal Science and Zoology

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