| Summary: | A redescription of the rictulariid nematode <i>Pterygodermatites</i> (<i>Pterygodermatites</i>) <i>plagiostoma</i> Wedl, 1861, is made by means of light and scanning electron microscopy, including the first data on male specimens. The morphologic study was based on specimens recovered from two Algerian hedgehogs (<i>Atelerix algirus</i>) from Tenerife and Gran Canaria islands (Canary Archipelago, Spain). The main characteristics of <i>P.</i> (<i>P.</i>) <i>plagiostoma</i> males are the presence of 49–53 pairs of cuticular projections, the presence of one or two midventral precloacal fans (generally one), and the size of two unequal spicules, measuring 98–123 µm (right spicule) and 185–236 µm (left spicule). The cloacal papillae are arranged according to the Ascaridida type. They include two precloacal pairs, an unpaired precloacal papilla, one pair lateral to the cloaca, six postcloacal pairs, and a pair of phasmids near the tail tip. Females are mainly characterized by the presence of 71–77 pairs of cuticular projections, with 43–46 pairs of prevulvar combs, by the differentiation from combs to spines at the level of or slightly posterior to the vulva and by the position of the vulva, located posteriorly to the esophagus–intestine junction. Clear differences were found between <i>P.</i> (<i>P.</i>) <i>plagiostoma</i> and related species of the subgenus <i>P.</i> (<i>Pterygodermatites</i>).
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