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<p><i>Xiphinema thailandicum</i> n. sp. recovered from the rhizosphere of <i>Platycerium</i> plants and an unidentified plant imported from Thailand are described here. The new species was characterized by a relatively short and stout body (L = 1.3–1.6&#xa0;mm, a = 20.0–33.0); total stylet length of 176–206&#xa0;µm; mono-opisthodelphic reproductive system without the anterior gonad; anteriorly situated vulva (V = 31.7%–37.0%); short tail (36.0–51.2&#xa0;µm); conoid, convex dorsal part with a 17.0–25.9&#xa0;µm long peg at the terminus; and three juvenile developmental stages with no males. The new species belonges to the <i>Xiphinema</i> non-<i>americanum</i> group morphospecies 1 and has the following specific diagnostic alphanumeric codes (the code in parentheses is an exception): A1, B4, C5a, D(4)5, E23, F12, G23, H2, I2, J-, K2, and L1. It was morphologically similar to <i>X. bambusi</i>, <i>X. bhutanense</i>, <i>X. brasiliense</i>, <i>X</i>. <i>digicaudatum</i>, and <i>X</i>. <i>hunaniense</i> mainly due to the short conoid tail and terminal peg. Molecular phylogenetic analyses based on partial 18S, 28S-D2-D3 and ITS rRNA genes showed that the new species forms a distinct, well-supported clade closely related to <i>X. brasiliense</i> and <i>X. ensiculiferum</i>. The new species exhibits sequence divergence of 0.47% from <i>X</i>. <i>ensiculiferum</i>, 0.29%-0.47% from <i>X</i>. <i>brasiliense</i> for the 18S rRNA gene, 1.97%-2.47% from <i>X</i>. <i>brasiliense</i> for the 28S-D2-D3 rRNA gene, and 6.31%-9.27% from <i>X</i>. <i>brasiliense</i> for the ITS rRNA gene, respectively. These findings support its identity as a distinct species using integrative taxonomy combining morphological and molecular data.</p>

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Description of the Xiphinema thailandicum n. sp. (Dorylaimida: Longidorinae) associated with Platycerium spp. and an unidentified plant from Thailand

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Kai Guo,
  • Jianfeng Gu,
  • Yiwu Fang,
  • Xinxin Ma,
  • Kui Fang,
  • Min Li,
  • Yan Ya,
  • Yu Du

摘要

Xiphinema thailandicum n. sp. recovered from the rhizosphere of Platycerium plants and an unidentified plant imported from Thailand are described here. The new species was characterized by a relatively short and stout body (L = 1.3–1.6 mm, a = 20.0–33.0); total stylet length of 176–206 µm; mono-opisthodelphic reproductive system without the anterior gonad; anteriorly situated vulva (V = 31.7%–37.0%); short tail (36.0–51.2 µm); conoid, convex dorsal part with a 17.0–25.9 µm long peg at the terminus; and three juvenile developmental stages with no males. The new species belonges to the Xiphinema non-americanum group morphospecies 1 and has the following specific diagnostic alphanumeric codes (the code in parentheses is an exception): A1, B4, C5a, D(4)5, E23, F12, G23, H2, I2, J-, K2, and L1. It was morphologically similar to X. bambusi, X. bhutanense, X. brasiliense, X. digicaudatum, and X. hunaniense mainly due to the short conoid tail and terminal peg. Molecular phylogenetic analyses based on partial 18S, 28S-D2-D3 and ITS rRNA genes showed that the new species forms a distinct, well-supported clade closely related to X. brasiliense and X. ensiculiferum. The new species exhibits sequence divergence of 0.47% from X. ensiculiferum, 0.29%-0.47% from X. brasiliense for the 18S rRNA gene, 1.97%-2.47% from X. brasiliense for the 28S-D2-D3 rRNA gene, and 6.31%-9.27% from X. brasiliense for the ITS rRNA gene, respectively. These findings support its identity as a distinct species using integrative taxonomy combining morphological and molecular data.