Out of the ancient lake: Multiple riverine colonizations and diversification of the freshwater snails in the genus Semisulcospira around Lake Biwa

Morita, Kohei; Saito, Takumi; Uechi, Takeru; Sawada, Naoto; Miura, Osamu

doi:10.1016/j.ympev.2023.107987

Molecular Phylogenetics and Evolution

2024

DOI: 10.1016/j.ympev.2023.107987

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Out of the ancient lake: Multiple riverine colonizations and diversification of the freshwater snails in the genus Semisulcospira around Lake Biwa

Kohei Morita,

Takumi Saito,

Takeru Uechi

et al.

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2024

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Cited by 2 publications

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Genomic evidence of reproductive isolation among the Semisulcospira snails radiated in the ancient Lake Biwa

Ueno,

Urabe,

Nakai

et al. 2024

Journal of Evolutionary Biology

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Determining species boundaries within rapidly evolving species flocks is essential to understanding their evolutionary history but is often difficult to achieve due to the lack of clear diagnostic features. Ancient Lake Biwa harbors endemic snails in the genus Semisulcospira, a species flock with 19 described species. However, their morphological and genetic similarity cast doubt on the validity of their species status and their histories of explosive speciation. To evaluate their species boundaries, we examine patterns of gene flow among the sympatric or parapatric nominal Semisulcospira species in Lake Biwa. The principal component analysis and Bayesian structure analysis based on the genome-wide genotyping dataset demonstrated no gene flow between five pairs of the Semisulcospira species. However, we found the hybrids between the closely related species pair, Semisulcospira decipiens and S. rugosa. Despite the presence of hybrids, these nominal species still formed their own genetic clusters. There are variations in the chromosome numbers among these species, potentially providing an intrinsic barrier to panmictic gene flow. Our study showed complete or partial reproductive isolation among the sympatric or parapatric Semisulcospira species, demonstrating that the Semisulcospira snails are real species assemblages radiated in Lake Biwa. Our study provides significant implications for establishing species boundaries among rapidly evolving freshwater species in ancient lakes.

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Genomic evidence of reproductive isolation among the Semisulcospira snails radiated in the ancient Lake Biwa

Ueno,

Urabe,

Nakai

et al. 2024

Journal of Evolutionary Biology

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Redescription of Semisulcospira reticulata (Mollusca, Semisulcospiridae) with description of a new species from Lake Biwa, Japan

Sawada,

Fuke,

Miura

et al. 2024

EvolSyst

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Semisulcospira Boettger, 1886 is a freshwater snail genus divergent in Lake Biwa, Japan. Although recent taxonomic studies of the genus have arranged taxonomic accounts of many species in the lake, our knowledge of morphological traits has still been insufficient in S. reticulata Kajiyama & Habe, 1961, which belongs to the S. niponica-group in the genus. Among the various habitats of the lacustrine species, in addition, the species richness of this group in coastal sandy mud areas of the lake has not been completely clarified. In this study, we revisited the taxonomic account of S. reticulata and described a new S. niponica-group species, S. nishimuraisp. nov., from Lake Biwa by evaluating the genetic and morphological relationships within the group. The reconstructed maximum likelihood and singular value decomposition quartets trees, and ADMIXTURE analyses using genome-wide SNP data strongly supported the genetic distinctiveness of most S. niponica-group species. The Random Forest classification showed that S. reticulata possesses a unique, large protoconch without distinct keels, and that S. nishimuraisp. nov. is characterized by a small, less elongated teleoconch and tiny protoconch. The large protoconch of S. reticulata and the narrow radulae of S. reticulata and S. nishimuraisp. nov. suggest their specialization in life history and feeding habits, respectively. The discovery of the new species from sandy mud substrates highlights niche differentiation among Semisulcospira species, and provides new insights into the diversification of the genus in ancient lakes.

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Out of the ancient lake: Multiple riverine colonizations and diversification of the freshwater snails in the genus Semisulcospira around Lake Biwa

Cited by 2 publications

References 58 publications

Genomic evidence of reproductive isolation among the Semisulcospira snails radiated in the ancient Lake Biwa

Genomic evidence of reproductive isolation among the Semisulcospira snails radiated in the ancient Lake Biwa

Redescription of Semisulcospira reticulata (Mollusca, Semisulcospiridae) with description of a new species from Lake Biwa, Japan

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