Zaitzeviaria chenzhitengi Jiang, Wu & Chen, 2025

Zaitzeviaria chenzhitengi Jiang, Wu & Chen sp. nov. (DZoiaeṃDzę)

( Figs 1A–B View FIGURE 1 , 2A–I View FIGURE 2 )

Type material (62 exs: 16 ♂♂, 16 ♀♀, 30 exs., sex unidentified): Holotype: CHINA: ♂, labelled 'China: Yunnan, Diqing Tibetan Autonomous Prefecture (ȅẑäânśṅ), Deqin County (ẽü县), Benzilan Town (奔Ŧť ª), Yujie Village (īżñ), 02.IV.2021, Zhi-Teng Chen leg.' ( GUGC) . Paratypes: 15 ♂♂, 16 ♀♀, 30 exs., sex undetermined: with same label data as the holotype ( GUGC) .

Description. Male. Body ( Fig. 1A View FIGURE 1 ) small, long-oval, moderately convex dorsally. Coloration: body dark brown, antenna, anterior margin of pronotum, tibiae, and tarsi with claws light brown. Plastron setae cover following areas: cranium around eyes on dorsal and ventral surface, hypomera, lateral portion of prosternum, elytra from carinate interval VII outwards, mesoventrite, metaventrite, abdomen and femora.

Head ( Fig. 2A View FIGURE 2 ), wider than long, dorsal surface except disc with plastron setae and sparse large punctures with distances 2.9–3.0× diameter of a puncture; each puncture bears a long seta. Clypeus with sparse long setae, anterior margin nearly straight. Labrum transverse, slightly narrower than clypeus, surface finely covered with sparse long setae, anterior parts of lateral margins rounded, with long bristles, anterior margin weakly curved, reddish brown. Antenna relatively short, much shorter than length of pronotum, and 8-segmented.

Pronotum ( Fig. 2B View FIGURE 2 ) about as long as wide, PL/PW: 0.95, disc shiny and smooth, nearly regularly punctured with round, setiferous punctures; puncture diameter ca. 0.75× diameter of an eye facet, and their distance varies between 1.0–4.0× of a facet diameter. Surface in anterior and posterior angles with microgranules and fine wrinkles.Anterior margin arcuate, angles weakly produced. Posterior margin trisinuate, emarginated before scutellum, posterior angles obtuse. Medial longitudinal impression thin, distinct but short, and confined to middle 2/5 of pronotal length. Sublateral carinae thin, present along 3/5 length of pronotum, posterior half subparallel, and anterior one distinctly curved outwards. Prosternal process ( Fig. 2D View FIGURE 2 ) with rounded apex, surface with sparse long setae, disc shiny, surface of marginal portions wrinkled and microreticulated.

Elytra ( Fig. 2C View FIGURE 2 ), about 1.7 times as long as wide, EL/EW: 1.67–1.68; widest at apical 1/3. Surface smooth and covered with sparse, long setae arranged in longitudinal rows. Each elytron with granulate carina on intervals VII and VIII, other intervals flat. Hind wings long, fully developed. Scutellum ( Fig. 4B View FIGURE 4 ) narrow and triangular, margins finely curved, surface shiny, hairless.

Metaventrite ( Fig. 2D View FIGURE 2 ). Disc smooth with sparse small punctures, each puncture bearing a long seta, sides with plastron. Discrimen well impressed, extending and widening from nearly anterior margin to posterior margin. Area behind each mesocoxa with a large round puncture and several smaller irregular macropunctures. Metakatepisternal suture marked with a row of smaller irregular macropunctures.

Abdomen ( Fig. 2D View FIGURE 2 ). Middle regions of ventrites I–IV and anterior part of ventrite V smooth and shiny, with sparse small punctures, each bearing a long seta. Other parts of abdomen covered with plastron setae intermixed with sparse, long setae. Admedian carinae of ventrite I distinct, straight, extending from base to apex.

Legs simple; femora widened, surface covered with sericeous tomentum; inner side of tibiae with cleaning fringes; tarsi slightly shorter tibiae; tarsal claws simple. Protibiae ( Fig. 2E View FIGURE 2 ) in males moderately wider than in females.

Aedeagus ( Figs 2G–I View FIGURE 2 ) slender, widest near middle, apex of median lobe distinctly narrowed. A pair of curved sclerotizations at middle of median lobe.

Measurements of males (n= 10): CL: 1.73–1.81 mm (1.76±0.03); PL: 0.54–0.55 mm (0.55±0.01); PW: 0.57– 0.58 mm (0.57±0.01); EL: 1.19–1.25 mm (1.22±0.03); EW: 0.71–0.75 mm (0.73±0.01).

Females ( Fig. 1B View FIGURE 1 ), externally similar to the males, averagely larger, protibiae ( Fig. 2F View FIGURE 2 ) slightly narrower than in males. Without another distinct sexual character to males.

Measurements of females (n= 10): CL: 1.69–1.91 mm (1.77±0.07); PL: 0.51–0.57 mm (0.55±0.02); PW: 0.55– 0.61 mm (0.58±0.02); EL: 1.17–1.34 mm (1.22±0.07); EW: 0.72–0.81 mm (0.76±0.03).

Distribution. The species is reported only from the type locality.

Biology. All adults were collected from the bottom crack of stone in a small ravine stream ( Figs 5A–B View FIGURE 5 ).

Etymology. The species epithet honors to Dr Zhi-Teng Chen (Jiangsu University of Science and Technology), the collector of the new species. The name is treated as an adjective.

Comparative diagnosis. Z. chenzhitengi sp. nov. is similar to Z. gotoi ( Nomura, 1959) and Z. kuriharai Kamite, Ogata & M. Satô, 2006 in habitus, such as the similar slender body form and coloration. The new species can be easily distinguished from the latter by the longitudinal impression of the pronotum confined to the pronotal middle and not touching the posterior margin (vs longitudinal impression of pronotum reaching posterior margin) and the median lobe of aedeagus not curved at the base (vs distinctly curved).

The new species is also more or less similar to Zaitzeviaria obesa Jung, Jäch & Baea, 2014 in habitus. Both species share a slender body form. The different forms of longitudinal impression of pronotum can easily distinguish them. The longitudinal impression of Z. obesa is much longer, with a pair of round foveae located at basal sides, while the longitudinal impression of the new species is much shorter and basal sides lack foveae.