Zaitzeviaria tongi Bian & Jäch, 2026, sp. nov.

Zaitzeviaria tongi sp. nov. Figs 3 C, 3 D, 7 A – C, 9 D – F Type material (24 specimens). Holotype: China • ♂ (IAECAS): “ CHINA: Shaanxi, Ankang City, \ Ningshan County, Xunyang Dam | 33°33.473'N, 108°32.808'E, \ Alt. 1355 m, 2019.8.20 \ Leg. Tong Y. F ”. Paratypes: China, Shaanxi • 9 ♂♂, 13 ♀♀ (IAECAS), same data as holotype • 1 ♀ (NMW): “ China: Shaanxi, 3.6.1998 \ Zhouzhi County, ca. 1300 m \ 2 km E Houzhenzi Nat. Res. \ leg. M. Wang (CWBS 310) ”. Additional material examined (78 specimens). China, Hubei • 4 ♂♂, 12 ♀♀ (IAECAS): “ CHINA: Hubei, Enshi \ Lichuan County | 1450 m, 2004.10.26 \ Leg. Wang (CWBS 555) ” • 62 exs. (NMW): “ China: Hubei, 26.10.2004 \ Fubaoshan Forest Park \ 50 km WSW Lichuan \ 1450 m, leg. Schönmann \ & Wang (CWBS 555) ”. Diagnosis. This species is similar to Zaitzeviaria muchuanensis because of the presence of a lateral aedeagal constriction (indentation) at about apical 0.4. Acuminate apex of median lobe distinctly longer than in Z. muchuanensis; endophallus with characteristic inverted y-shaped sclerotization in basal half. Description. BL 1.45 mm, EW 0.70 mm (holotype). Habitus as in Fig. 3 C, D. Body obovate. Head, pronotum, prosternum, prosternal process, and mesoventrite black, elytra, metaventrite, ventrites and femora testaceous; antennae and tarsi yellowish-brown. Labrum smooth and shiny, sparsely punctate and pubescent, densely pubescent at anterior corners. Clypeus and frons smooth and shiny, sparsely pubescent. Areas at inner margins of eyes coarsely granulate. Pronotum as in Figs 3 C, 7 A (holotype: PL 0.5 mm, PW 0.54 mm) subparallel in basal 0.4, slightly narrowed anteriorly. Disc smooth and shiny, setal punctures sparsely scattered. Median sulcus present in basal 0.9; sublateral furrows fine, bisinuous, slightly carinate basally. Anterior and posterior corners coarsely granulate. Anterior corners acute, slightly produced, posterior corners almost rectangular. Elytra (holotype: EL 0.95 mm, EW 0.70 mm) broadest at basal 0.7, slightly narrowed anteriorly and distinctly attenuate posteriorly. Strial punctures large in basal half, separated by 0.5–1.0 puncture diameter; posteriorly, punctures are becoming smaller and well separated by 2–4 times their diameters. Intervals flat, smooth and shiny, each with a row of small setae. Intervals VII and VIII carinate from base to subapical part. Lateral margin crenulate. Prosternum (Figs 3 D, 7 B) coarse, not pubescent medially; lateral sides densely pubescent, sparsely granulate. Prosternal process (Fig. 7 B) distinctly narrowed from base to narrowly rounded apex; disc coarse, almost impunctate; lateral margin distinctly rimmed. Metaventrite (Fig. 7 C) sexually dimorphic, densely and finely punctate; median sulcus complete, slightly anteriorly narrowed; lateral sides densely pubescent and sparsely granulate; with a large oblique impression posterior of mesocoxae, and a row of large punctures anterior of metacoxae. Legs without sexual dimorphism. Ventral side of abdomen as in Fig. 7 C. Ventrite I with a pair of admedian carinae; middle densely punctate; median parts of ventrites II – IV and basal half of middle of ventrite V smooth and shiny, sparsely punctate; lateral parts of ventrites II – IV pubescent and sparsely granulate. Apical half of ventrite V densely micropunctate. Males. BL 1.35–1.45 mm, BW 0.65–0.72 mm (n = 10). Disc of posterior 3 / 4 metaventrite distinctly impressed. Apex of ventrite V truncate. Aedeagus (Fig. 9 D – F). Penis about four times as long as phallobase, subparallel in basal 0.9, distinctly acuminate in distal 0.1, lateral side with a faint, often hardly visible indention at apical 0.4; base curved in lateral view. Endophallus with distinct inverted y-shaped sclerotization in basal half. Parameres completely fused to penis. Females. BL 1.35–1.55 mm, BW 0.65–0.75 mm (n = 11). Disc of metaventrite slightly convex. Apex of ventrite V narrowly rounded. Remarks. The specimens from Hubei are not designated as paratypes because of some deviating characters, which leave some doubt about their conspecificity. In the Hubei specimens, the elytral punctures are larger and deeper, the elytra are less roof-like but more regularly rounded and more strongly convex in cross section, and the seventh interval is less markedly elevated, while it is strongly raised in the Shaanxi specimens. In the specimens from Shaanxi, the median lobe ca 500 µm long, while it measures about 570 µm in specimens from Hubei. The indentation of the median lobe is hardly perceptible in specimens from Hubei. Here, we tentatively assign these 78 specimens from southern Hubei to Z. tongi, but it should be kept in mind that DNA sequencing might reveal that they actually represent an undescribed, closely related species. Distribution. China: Shaanxi. This species is so far known with certainty only from two localities in southern Shaanxi Province. The identification of the specimens from Hubei Province needs to be confirmed by molecular data. Etymology. This species is named after Yanfeng Tong (Shenyang Normal University, Liaoning, China), who collected the holotype and most of the paratypes.