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<p>Myxosporean parasites have been identified in amphibians globally; however, in Japan, no amphibian-infecting myxosporeans have been formally recorded. Thus, in this study, 20 native Japanese frog species were surveyed to clarify the diversity of myxosporeans that infect amphibians. A survey of 102 anurans representing 20 species across six families collected in Japan revealed the presence of a myxosporean belonging to the genus <i>Sphaerospora</i> that parasitizes the kidneys of the Japanese rice frog, <i>Fejervarya kawamurai</i>. The myxosporean is described herein as a new species based on its distinct morphological characteristics and phylogenetic position. Spores are spherical to subspherical with an overall dimension of 11.1 (10.2–12.2) × 11.5 (9.3–14.0) µm. The polar capsules are spherical, with a diameter of 3.3 (2.5–4.3) µm. Typical spores possess a characteristic caudal appendage. This discovery is considered the first record of anuran-parasitic <i>Sphaerospora</i> in East Asia and the fifth global record of a frog-parasitic species in this genus. Phylogenetic analysis based on partial SSU rDNA sequences unequivocally placed the new species within a well-supported monophyletic clade of anuran-parasitic <i>Sphaerospora</i>, comprising taxa distributed across the Palaearctic (Asia and Europe), Afrotropical, Nearctic, and Neotropical realms.</p>

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A New Species of Sphaerospora Thélohan, 1892 (Myxozoa: Myxosporea: Bivalvulida) From the Japanese Rice Frog Fejervarya kawamurai: The First East Asian Record of Anuran-Parasitic Sphaerosporids

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Ken Inoue,
  • Kanto Nishikawa

摘要

Myxosporean parasites have been identified in amphibians globally; however, in Japan, no amphibian-infecting myxosporeans have been formally recorded. Thus, in this study, 20 native Japanese frog species were surveyed to clarify the diversity of myxosporeans that infect amphibians. A survey of 102 anurans representing 20 species across six families collected in Japan revealed the presence of a myxosporean belonging to the genus Sphaerospora that parasitizes the kidneys of the Japanese rice frog, Fejervarya kawamurai. The myxosporean is described herein as a new species based on its distinct morphological characteristics and phylogenetic position. Spores are spherical to subspherical with an overall dimension of 11.1 (10.2–12.2) × 11.5 (9.3–14.0) µm. The polar capsules are spherical, with a diameter of 3.3 (2.5–4.3) µm. Typical spores possess a characteristic caudal appendage. This discovery is considered the first record of anuran-parasitic Sphaerospora in East Asia and the fifth global record of a frog-parasitic species in this genus. Phylogenetic analysis based on partial SSU rDNA sequences unequivocally placed the new species within a well-supported monophyletic clade of anuran-parasitic Sphaerospora, comprising taxa distributed across the Palaearctic (Asia and Europe), Afrotropical, Nearctic, and Neotropical realms.