Xystodesmus bazanensis Kim & Korsós & Hwang 2026, comb. nov.

Xystodesmus bazanensis (Takakuwa, 1942) comb. nov. Figs 3B, 15 Pachydesmus bazanensis Takakuwa, 1942a: 363, 366, fig. 6. Nikkonus bazanensis – Chamberlin & Wang 1953: 9. — Marek et al. 2014: 81. Pachydesmus bazanensis – Tanabe & Shinohara 1996: 1487 (“species possibly belonging to Xystodesmus ”). — Korsós & Nakamura 2025: 228. Diagnosis “Mit Ausnahme von Gonopoden stimmt diese Spezies ähnelr [sic] vielmehr der vorigen Koreoariaart (K. amoena) besonders stimmt sie im Aussehen und Farbe überein, jedoch ist bei dieser Spezies der rötliche Fleck auf Flügel etwas grösser als bei jener.” (Takakuwa 1942a: 366) (= “With the exception of gonopods, this species is more similar to the previous Koreoaria species (K. amoena), especially in appearance and colour, but in this species the reddish spot on the wing is slightly larger than in that one.” – translated from German.) Type material (not examined) SOUTH KOREA • 1 ♂; “Bazan (Süd-Korea)” (= Masan, today part of Changwon Distr., Gyeongsannam Prov., South Korea); Takakuwa’s private collection, including type material of many species, considered lost (Tanabe & Shinohara 1996). Description Without the type material and fresh specimens, we can only rely on Takakuwa’s (1942a: 366) description: “Körperlänge 22 mm, Körperbreite 4 mm. An der Hüfte des 2. Beinpaares des ♂ mit rundlichen Höckern, Sternit zwischen den Hüften des 4., 5., und 6. Beinpaares des ♂ mit dreieckigen oder spitzigen Zäpfen versehen, von denen der des 6. das grösste besitzt. Gonopoden: Hüfte breit, ohne Stab. Präfemur breit, dicht lang behaart, mit 2 grossen getrennten Fortsätzen, beide gerade, sind dem Proximalteil des Acropodits fast parallel gerichtet, und erreicht die Höhe sein Ende.” (= Body length 22 mm, width 4 mm. Coxae of male 2 nd legpair with roundish humps, 4 th, 5 th and 6 th sternites with triangular or pointed cones, of which the 6 th the largest. Gonopods: coxae wide, without apophysis. Prefemur (b) broad, with dense, long hairs, with two large separate processes (c, d), both straight, almost parallel with the proximal part of acropodite (a) and reaching its end in height.” – translated from German.) Female unknown. Distribution Known only from its type locality (“Bazan”, South Korea; Takakuwa 1942a) (Fig. 15). Remarks This species was considered dubious for a long time (Attems 1938; Chamberlin & Wang 1953; Hoffman 1956), although its relation to the genus Xystodesmus was already suspected (Tanabe & Shinohara 1996; Marek et al. 2014). Even Verhoeff (1937), when describing his Koreoaria pallida, thought that Pachydesmus was close to that genus. Later, Pachydesmus was restricted to the group of species in the eastern United States (Hoffman 1956), but with a schematic description and without type material the Korean P. bazanensis remained enigmatic for a long time (Nguyen et al. 2016; Kim et al. 2023). Recently, Korsós & Nakamura (2025) speculated about its status, but still abstained from assigning it to a genus. Based on our detailed study of Korean xystodesmids, even without fresh samples of the species at hand, but based on the original diagnostic characters (size and colouration), we here take the opportunity to settle the generic affiliation, and establish the new combination Xystodesmus bazanensis (Takakuwa, 1942) comb. nov.