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A new species of Dicharax (Caenogastropoda: Cyclophoridae: Alycaeinae) from Amami-Oshima Island, Japan
Matsuda, H.; Yano, S. (2025). A new species of Dicharax (Caenogastropoda: Cyclophoridae: Alycaeinae) from Amami-Oshima Island, Japan. Venus (Toukyou) 83(1-4): 1-13. https://dx.doi.org/10.18941/venus.83.1-4_1
In: Venus (Toukyou). Malacological Society of Japan: Tokyo. ISSN 1348-2955, meer
Peer reviewed article  
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Trefwoorden
    Classification > Taxonomy
    Taxa > Species > New taxa > New species
Author keywords
    Alycaeinae, Amami-Oshima, Dicharax
Auteurs  Top 
  • Matsuda, H.
  • Yano, S.
Abstract
    Dicharax amamiensis n. sp. is described based on specimens from Amami-Oshima Island, Japan. The new species has hitherto been identified in the Japanese literature as Dicharax purus (as Chamalycaeus purus), which was originally described from Tokunoshima Island. However, a molecular phylogenetic analysis using mitochondrial cytochrome oxidase subunit I gene and 16S rRNA region sequences of 10 species of Alycaeinae, as well as those of D. amamiensis n. sp., revealed that D. amamiensis n. sp. is distinct and separated from the congener D. purus. On the basis of morphological observations, D. amamiensis n. sp. differs from D. purus in possessing a relatively taller shell, a thick, slightly reflexed peristome, a proportionally broader penultimate whorl, and a narrower umbilicus
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