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<p>Scanning electron microscopy (SEM) studies of specimens (including some paratypes) of four North and Central American species of <i>Rhabdochona</i> Railliet, 1916 (Rhabdochonidae), all intestinal parasites of fishes, made it possible to redescribe in detail several taxonomically important morphological features of these nematodes that are difficult to observe using light microscopy (LM). Three of these species, <i>R</i>. <i>cascadilla</i> Wigdor, 1918, mainly from cyprinids in North America; <i>R</i>. <i>cubensis</i> Moravec &amp; Coy Otero, 1987, from a poeciliid in Cuba; and <i>R</i>. <i>longleyi</i> Moravec &amp; Huffman, 1988, from blind catfishes in subterranean waters in the USA, were studied by SEM for the first time. Surprisingly, the number of anterior prostomal teeth, one of the most important taxonomic features in <i>Rhabdochona</i>, was found to be 10 in <i>R</i>. <i>cubensis</i>, rather than 6 as originally reported; this indicates that the species belongs to the nominotypical subgenus <i>Rhabdochona</i>. Several morphological details in these species are confirmed or reported for the first time, such as the presence of sublabia in all species and the presence of ventral precloacal cuticular ridges in <i>R</i>. <i>cascadilla</i>. The shape of the deirids in <i>R</i>. <i>kidderi</i> specimens from the atypical host <i>Typhliasina pearsei</i> (Ophidiiformes) confirms their specific identification.</p>

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New data on the morphology of four North and Central American species of Rhabdochona Railliet, 1916 (Nematoda: Rhabdochonidae), as revealed by SEM

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • František Moravec

摘要

Scanning electron microscopy (SEM) studies of specimens (including some paratypes) of four North and Central American species of Rhabdochona Railliet, 1916 (Rhabdochonidae), all intestinal parasites of fishes, made it possible to redescribe in detail several taxonomically important morphological features of these nematodes that are difficult to observe using light microscopy (LM). Three of these species, R. cascadilla Wigdor, 1918, mainly from cyprinids in North America; R. cubensis Moravec & Coy Otero, 1987, from a poeciliid in Cuba; and R. longleyi Moravec & Huffman, 1988, from blind catfishes in subterranean waters in the USA, were studied by SEM for the first time. Surprisingly, the number of anterior prostomal teeth, one of the most important taxonomic features in Rhabdochona, was found to be 10 in R. cubensis, rather than 6 as originally reported; this indicates that the species belongs to the nominotypical subgenus Rhabdochona. Several morphological details in these species are confirmed or reported for the first time, such as the presence of sublabia in all species and the presence of ventral precloacal cuticular ridges in R. cascadilla. The shape of the deirids in R. kidderi specimens from the atypical host Typhliasina pearsei (Ophidiiformes) confirms their specific identification.