Zaitzeviaria guiyangensis Jiang, Wu & Chen 2025, sp. nov.
Creators: name: Jiang, Ri-Xin
name: Chen, Xiang-Sheng
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Elmidae
Zaitzeviaria
Zaitzeviaria guiyangensis

description: Zaitzeviaria guiyangensis Jiang, Wu & Chen sp. nov. (DzmaeṃDzę)
(Figs 2A–B, 4A–I)
Type material (34 exs: 21 ♂♂, 13 ♀♀): Holotype: CHINA: ♂, labeled 'China: Guizhou, Guiyang City (ãș Ṫ), Wudang District (乌±区), Xinbaobuyi Township (Ĕ堡ħ依â乡), Xiangzhigou Scenic Area (ēǎŝā区), 26°47'02"N, 106°56'09"E, H: 1187m, 06.XI.2023, Jiang Ri-Xin leg.' (GUGC). Paratype: 20 ♂♂, 13 ♀♀, with same label data as the holotype (GUGC).
Description. Male. Body (Fig. 3A) small, long-oval, and moderately convex dorsally. Coloration: body dark brown, antenna, anterior margin of pronotum and legs light brown. Plastron setae cover following areas: cranium around eyes on ventral surface of head, hypomera, lateral portion of prosternum, elytra from carinate interval XII outwards and epipleura, lateral parts of mesoventrite, metaventrite abdomen and of femora.
Head (Fig. 4A), wider than long, dorsal surface except disc with plastron setae and sparse large punctures spaced about 1.0–2.5× diameter of a puncture; each puncture bears a long seta. Clypeus with sparse long setae, anterior margin weakly emarginate. Labrum transverse, about as wide as clypeus, surface microreticulated and 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. 4B), slightly wider than long, PL/PW: 0.87–0.91, disc shiny and smooth, nearly regularly punctured with round setiferous punctures; puncture diameter ca. 0.5× diameter of an eye facet, and their distance varies between 2.0–3.0× of a facet diameter. Surface in anterior and posterior angles with microgranules and fine wrinkles.Anterior margin curved, angles weakly produced. Posterior margin trisinuate, emarginated before scutellum, posterior angles obtuse. Medial longitudinal impression thin, distinct and long, confined to anterior 5/6 of pronotal length. Sublateral carinae thin, present along more than half length of pronotum, sinuated. Prosternal process (Fig. 4D) with rounded apex, surface with sparse long setae; disc shiny, surface of marginal portions wrinkled, areas near lateral margins microreticulated. Scutellum (Fig. 4B) wide, triangular, anterior margin weakly curved, lateral margin finely curved, surface shiny, hairless.
Elytra (Fig. 4C), about 1.4 times as long as wide, EL/EW: 1.43–1.45, widest at apical 1/3, lateral margins subparallel at anterior 2/3. Surface smooth and covered with sparse long setae arranged in longitudinal rows. Each elytron with granulate carina on interval VII and VIII, and other intervals flat. Hind wings long, fully developed.
Metaventrite (Fig. 4D). Disc smooth with sparse small punctures, each puncture bearing a long seta, sides with plastron. Discrimen well impressed and long, extending and widening from anterior margin to posterior margin, surface along discrimen distinctly wrinkled.Area behind each mesocoxa with a large round macropuncture and several smaller irregular macropunctures. Metakatepisternal suture marked with a row of small irregular macropunctures.
Abdomen (Fig. 4D). 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. 4E) in males moderately wider than in females.
Aedeagus (Figs 4G–I) slender, distinctly curved at base in lateral view, parameres completely fused to median lobe. Apex of median lobe aculeated, distinctly curved in lateral view. A pair of elongate sclerotizations at basal half of median lobe.
Measurements of males (n= 10): CL: 1.42–1.54 mm (1.46±0.04); PL: 0.46–0.53 mm (0.48±0.02); PW: 0.53– 0.58 mm (0.56±0.02); EL: 0.96–1.06 mm (0.99±0.04); EW: 0.67–0.73 mm (0.69±0.02).
Females (Fig. 3B) are externally similar to males, averagely larger, and their protibiae (Fig. 4F) are narrower than in males; other distinct sexual characters to males are absent.
Measurements of female (n= 10): CL: 1.40–1.62 mm (1.53±0.06); PL: 0.46–0.52 mm (0.49±0.02); PW: 0.55– 0.62 mm (0.59±0.02); EL: 0.94–1.10 mm (1.04±0.05); EW: 0.68–0.76 mm (0.72±0.03).
Distribution. The species is known only from the type locality.
Biology. All adults were collected from the bottom crack of stone in a small ravine stream (Figs 5C–D).
Etymology. The specific epithet refers to the type locality: Guiyang City (Guizhou Province, China). The name is treated as an adjective.
Comparative diagnosis. This new species is similar to Zaitzeviaria muchuanensis Jiang & Chen, 2023 in habitus from Sichuan Province, China. The new species can be distinguished from the latter species by the following characters: 1) body slightly larger, CL: 1.42–1.54 mm in males (vs CL: 1.25–1.41 mm); 2) punctures on the surface of pronotum large and distinct (vs. much smaller); 3) prosternal process narrower (vs distinctly wider); 4) sclerotizations of median lobe elongate (vs small and short).
Z. guiyangensis sp. nov. is also similar to Zaitzeviaria atratula (Grouvelle, 1911) in habitus; and it can be distinguished from Z. atratula by the following characters: 1) body dark brown (vs brown); 2) body much larger, CL: 1.42–1.54 mm in male (vs 1.2 mm); 3) longitudinal impression longer, about 5/6 length of pronotum (vs shorter, about 4/5 length of pronotum).
description: Published as part of Jiang, Ri-Xin & Chen, Xiang-Sheng, 2025, Two new species of the genus Zaitzeviaria Nomura, 1959 (Coleoptera: Elmidae) from China, pp. 137-145 in Zootaxa 5584 (1) on pages 140-144, DOI: 10.11646/zootaxa.5584.1.9, http://zenodo.org/record/14812441