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<p>Although a ninespine stickleback (<i>Pungitius</i> d'Annone 1760) inhabiting the Kanto region of Honshu Island, Japan, was reported as an undescribed species in the early 1960’s, it has at no time been formally described. Morphologically similar to <i>Pungitius sinensis</i> (Guichenot 1869), the former is now described as <i>Pungitius nakamurai</i> sp. nov., being usually differentiated from all other congeners by the following combination of characters: dorsal-fin rays IX + 11; anal-fin rays I + 9; pectoral-fin rays 10; pelvic-fin rays I + 1; procurrent caudal-fin rays 5 + 5 = 10; lateral plates in an incomplete row, forming a distinct lateral keel on caudal peduncle; 6 plates on ventral surface of caudal peduncle; vertebrae 33 (14 abdominal and 19 caudal vertebrae); dorsal-fin spines inclining alternately to sides of mid-line; first dorsal-fin spine antero- or postero-dorsal to upper end of pectoral-fin base; ascending process of pelvis well-developed, upper end of pelvis reaching to level of fifth pectoral-fin ray base; antero-ventral process of ectocoracoid present, right and left ectocoracoids articulating anteriorly with each other; no distinct ridge on cleithrum and ectocoracoid; body dark yellow or dark green; membranes of dorsal-fin spines hyaline or with a few minute black spots; membrane of pelvic-fin spine of adult males white, becoming blue during courtship behavior; membrane of anal-fin spine of adult males whitish with a distinct white blotch (turning blue during courtship).</p>

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A new species of ninespine stickleback, Pungitius nakamurai (Gasterosteiformes, Gasterosteidae), endemic to Honshu Island, Japan

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Tatsuya Matsumoto,
  • Keiichi Matsuura

摘要

Although a ninespine stickleback (Pungitius d'Annone 1760) inhabiting the Kanto region of Honshu Island, Japan, was reported as an undescribed species in the early 1960’s, it has at no time been formally described. Morphologically similar to Pungitius sinensis (Guichenot 1869), the former is now described as Pungitius nakamurai sp. nov., being usually differentiated from all other congeners by the following combination of characters: dorsal-fin rays IX + 11; anal-fin rays I + 9; pectoral-fin rays 10; pelvic-fin rays I + 1; procurrent caudal-fin rays 5 + 5 = 10; lateral plates in an incomplete row, forming a distinct lateral keel on caudal peduncle; 6 plates on ventral surface of caudal peduncle; vertebrae 33 (14 abdominal and 19 caudal vertebrae); dorsal-fin spines inclining alternately to sides of mid-line; first dorsal-fin spine antero- or postero-dorsal to upper end of pectoral-fin base; ascending process of pelvis well-developed, upper end of pelvis reaching to level of fifth pectoral-fin ray base; antero-ventral process of ectocoracoid present, right and left ectocoracoids articulating anteriorly with each other; no distinct ridge on cleithrum and ectocoracoid; body dark yellow or dark green; membranes of dorsal-fin spines hyaline or with a few minute black spots; membrane of pelvic-fin spine of adult males white, becoming blue during courtship behavior; membrane of anal-fin spine of adult males whitish with a distinct white blotch (turning blue during courtship).