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<p>The long-fin herring <i>Pellona dayi</i> Wongratana 1983 (Clupeiformes: Pristigasteridae), was considered for decades to be one of only two valid Indo-Pacific species of its genus. While the other historically dominant Indo-Pacific species, “<i>Pellona ditchela</i>” has recently been split into multiple taxa, the morphology, distribution, and monophyly of <i>P. dayi</i> has remained poorly characterized. <i>Pellona dayi</i> was described based on type specimens from the eastern coast of India, with no additional specimens known. Here, we redescribe this species in detail and confirm its validity on the basis of 15 specimens from eastern Indian Ocean. <i>Pellona dayi</i> is distinguishable from the other Indo-Pacific congeners by its shallow, slender body and lower gill raker counts. Mitochondrial cytochrome <i>c</i> oxidase subunit I (COI) comparative analysis revealed that <i>P. dayi</i> and <i>Pellona hoevenii</i> Bleeker 1852 are sister species, diverging from each other by a 6.5% mean uncorrected genetic distance. Judging from the distributional ranges of <i>P. dayi</i> and <i>P. hoevenii</i>, the speciation of these two taxa may have been promoted by the aerial exposure of the Sunda Shelf during Quaternary glaciation intervals, as recently proposed for other clupeiform species in the region.</p>

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Redescription and distributional range extension of a poorly known long-fin herring Pellona dayi Wongratana 1983 (Teleostei: Clupeiformes: Pristigasteridae)

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Harutaka Hata,
  • Kunto Wibowo,
  • Sébastien Lavoué,
  • Lauren Sallan

摘要

The long-fin herring Pellona dayi Wongratana 1983 (Clupeiformes: Pristigasteridae), was considered for decades to be one of only two valid Indo-Pacific species of its genus. While the other historically dominant Indo-Pacific species, “Pellona ditchela” has recently been split into multiple taxa, the morphology, distribution, and monophyly of P. dayi has remained poorly characterized. Pellona dayi was described based on type specimens from the eastern coast of India, with no additional specimens known. Here, we redescribe this species in detail and confirm its validity on the basis of 15 specimens from eastern Indian Ocean. Pellona dayi is distinguishable from the other Indo-Pacific congeners by its shallow, slender body and lower gill raker counts. Mitochondrial cytochrome c oxidase subunit I (COI) comparative analysis revealed that P. dayi and Pellona hoevenii Bleeker 1852 are sister species, diverging from each other by a 6.5% mean uncorrected genetic distance. Judging from the distributional ranges of P. dayi and P. hoevenii, the speciation of these two taxa may have been promoted by the aerial exposure of the Sunda Shelf during Quaternary glaciation intervals, as recently proposed for other clupeiform species in the region.