A new species of Dicharax (Caenogastropoda: Cyclophoridae: Alycaeinae) from Amami-Oshima Island, Japan
In: Venus (Toukyou). Malacological Society of Japan: Tokyo. ISSN 1348-2955, more
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| Keywords |
Classification > Taxonomy
Taxa > Species > New taxa > New species
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| Author keywords |
Alycaeinae, Amami-Oshima, Dicharax |
| 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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