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Fusceulimoides kohtsukai gen. et sp. nov., a minute eulimid gastropod parasitic on the little brittle star Ophiactis savignyi in Central Japan
Takano, T.; Kano, Y.; Mogi, M.; Okanishi, M. (2023). Fusceulimoides kohtsukai gen. et sp. nov., a minute eulimid gastropod parasitic on the little brittle star Ophiactis savignyi in Central Japan. Zool. Sci. 40(1): 64-69. https://dx.doi.org/10.2108/zs220050
In: Zoological Science. Zoological Society of Japan: Tokyo. ISSN 0289-0003; e-ISSN 2212-3830, more
Peer reviewed article  
Available in  Authors 
Keywords
    Taxonomic status > New taxa > New genus
    Taxonomic status > New taxa > New species
    Echinodermata [WoRMS]; Eulimidae R. A. Philippi, 1853 [WoRMS]; Fusceulimoides kohtsukai Takano, Kano, Mogi & Okanishi, 2023 [WoRMS]; Gastropoda [WoRMS]; Mollusca [WoRMS]; Ophiactis savignyi (Müller & Troschel, 1842) [WoRMS]; Ophiuroidea [WoRMS]
    Marine/Coastal
Author keywords
    Echinodermata; Gastropoda; micromolluscs; molecular; phylogeny; Ophiuroidea; parasite; protoconch
Authors  Top 
  • Takano, T.
  • Kano, Y.
  • Mogi, M.
  • Okanishi, M.
Abstract
    Gastropods of over a dozen genera in the family Eulimidae have been identified as parasites of brittle stars, and many more remain to be discovered and described for a comprehensive understanding of the evolutionary history of their host–parasite relationships. In this study, we describe Fusceulimoides kohtsukai gen. et sp. nov., parasitic on the little brittle star, Ophiactis savignyi (Ophiactidae), in Kanagawa, central Japan. The new genus is distinguished from other eulimid genera by the combination of following seven conchological characters: (1) a very small size of up to 1.7 mm high, (2) a colorless translucent appearance, (3) a conical pupiform shape with a paucispiral protoconch, (4) slightly convex teleoconch whorls, (5) a remarkably large body whorl occupying 65–70% of the total shell height, (6) a broad, somewhat squarish and laterally expanded aperture with a strongly curved outer lip, and (7) a developed parietal callus without an indentation or depression in the umbilical area. A multi-locus molecular phylogeny revealed its distant relationship to Hemiliostraca + Pyramidelloides, a previously known clade of ophiuroid parasites, thereby suggesting multiple origins of this host–parasite association in Eulimidae.
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