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<p>The genus <i>Oxyascaris</i> consists of seven species of nematodes that parasitize the digestive tract of amphibians and reptiles in the Neotropical region. This paper describes a new species of the genus based on specimens collected from a hylid anuran in the Dry Chaco ecoregion. A total of 14 specimens of <i>Scinax acuminatus</i> were collected between 2017 and 2021 in Matacos department, Formosa province, Argentina. The morphology of the nematodes was studied in detail using light microscopy and scanning electron microscopy. Thirty-four nematodes belonging to the genus <i>Oxyascaris</i> were collected in the large intestine of seven of examined amphibians. Based on the number and arrangement of pairs of caudal papillae, the presence of lateral alae in males and females, the lack of a gubernaculum, the absence of a vesicle at the anterior region in females, and the distinctive morphology of the spicules (equal in length), we verified that the specimens belong to a new species. Additionally, we surveyed the geographical distribution of the species of the genus, which was represented on a map. The present work reports the 8th species of the genus <i>Oxyascaris</i> described in South America and the first of this genus to be described in an amphibian, anuran, from the Dry Chaco ecoregion in Argentina.</p>

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A New Species of Oxyascaris (Nematoda, Cosmocercidae) from Hylid Scinax acuminatus from Chaco Seco Ecoregion, Argentina

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Ana Nunes Santos,
  • Luiz Felipe Ferreira Trindade,
  • Francisco Tiago Vasconcelos Melo,
  • Cynthya Elizabeth González

摘要

The genus Oxyascaris consists of seven species of nematodes that parasitize the digestive tract of amphibians and reptiles in the Neotropical region. This paper describes a new species of the genus based on specimens collected from a hylid anuran in the Dry Chaco ecoregion. A total of 14 specimens of Scinax acuminatus were collected between 2017 and 2021 in Matacos department, Formosa province, Argentina. The morphology of the nematodes was studied in detail using light microscopy and scanning electron microscopy. Thirty-four nematodes belonging to the genus Oxyascaris were collected in the large intestine of seven of examined amphibians. Based on the number and arrangement of pairs of caudal papillae, the presence of lateral alae in males and females, the lack of a gubernaculum, the absence of a vesicle at the anterior region in females, and the distinctive morphology of the spicules (equal in length), we verified that the specimens belong to a new species. Additionally, we surveyed the geographical distribution of the species of the genus, which was represented on a map. The present work reports the 8th species of the genus Oxyascaris described in South America and the first of this genus to be described in an amphibian, anuran, from the Dry Chaco ecoregion in Argentina.