Document of bibliographic reference 363306

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Diversification in ancient Lake Biwa: integrative taxonomy reveals overlooked species diversity of the Japanese freshwater snail genus Semisulcospira (Mollusca: Semisulcospiridae)

Abstract

The freshwater snail genus Semisulcospira has adaptively radiated in the ancient Lake Biwa, Japan. Although significant geographical variations have been known in the shell morphology of Semisulcospira niponica, their systematics remain uncertain. We evaluated the systematic status of the geographical variations in S. niponica and its congenerics S. biwae and S. fuscata through morphological and genetic investigations. Genome-wide snp s were used to estimate their genetic relationships. Random Forest algorithms explored the morphological variation of the shells of the name-bearing types and newly collected specimens. Our results detected five genetic clusters and revealed the consistency of adult shell morphology with genetic relationships, reinforcing the robustness of shell morphology-based species delimitation of the genus. The present systematics synonymized S. biwae under S. niponica. The five genetic clusters corresponded to the two described species, S. niponica and S. fuscata, and three new species, Semisulcospira watanabei sp. nov., Semisulcospira nakanoi sp. nov., and Semisulcospira salebrosa sp. nov. discovered among the geographical variations of S. niponica. The observed similarities in substrate preference and differences in distribution patterns among species suggest that the diversification of the genus was accelerated by geographical isolation after the initial ecological niche differentiation. We suggest that the distributions of Semisulcospira species may have been influenced by competitive exclusion among them, and that multiple speciation events have occurred in similar patterns.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000942136300001

Bibliographic citation

Sawada, N.; Fuke, Y. (2022). Diversification in ancient Lake Biwa: integrative taxonomy reveals overlooked species diversity of the Japanese freshwater snail genus Semisulcospira (Mollusca: Semisulcospiridae). Contributions to Zoology 92(1): 1-37. https://dx.doi.org/10.1163/18759866-bja10035

Topic

Fresh water

Is peer reviewed

true

Access rights

open access

Is accessible for free

true