Zaitzevia lipingae Jiang & Chen sp. nov.

Figs 1 B, 4, 5 (李氏寥溪泥甲)

Type material.

(3 ♂♂, 2 ♀♀): Holotype: China: • ♂, labeled ‘ China: Yunnan, Bao’an City (保安市), Longyang District (隆阳区), Lujiang Town (潞江镇), near Nankang Village (赧亢村), an unnamed stream, 24 ° 50 ' 46 " N, 98 ° 45 ' 38 " E; H: ~ 2000 m, 30. 07. 2023, Ping Li & Lan Jia leg. ’ (GUGC). • Paratypes: 2 ♂♂, 2 ♀♀, with the same label data as the holotype (GUGC).

Description.

Male. Large species, body elongately elliptical (Fig. 2 B), black with tibiae, tarsi, tarsal claws and antennae reddish brown, femora dark brown. Dorsal surface punctuated and frosted, covered with sparse setae. Plastron setae are confined to following areas: head (both dorsal and ventral surface, except middle part of frons, labrum and clypeus; Fig. 4 A), prosternum (Fig. 4 D), outer part of elytra (include epipleura; Fig. 3 C), outer parts of mesoventrite, metaventrite (Fig. 4 D), abdomen (except median part) and surface of femora (Fig. 4 E – H).

Head (Fig. 4 A), wider than long, dorsal surface (except middle part of frons, labrum and clypeus) covered with plastron setae and large, sparse punctures, each puncture bearing a long seta, the interspaces between the punctures about 1–1.5 times diameter of punctures. Clypeus without plastron setae, evenly punctate with large punctures and covered with long, sparse setae. Labrum transverse, shorter and slightly narrower than clypeus, covered with big punctures and long bristles at apical half, anterior margin almost straight, anterolateral angles rounded, basal 1 / 4 without puncture or seta. Antenna short, slightly clavate, with eight antennomeres, antennomere I slightly longer than wide, with several short setae; antennomere II slightly longer than antennomere I, strongly expanded, covered with several long setae, apical margin circled with short setae; antennomere III longer than wide; antennomeres IV – VII strongly transverse; antennomere VIII elliptical, elongate and strongly expanded, apex covered with dense long setae.

Pronotum (Fig. 4 B) about as long as wide, widest at base. Anterior margin arcuate with angles moderately produced and acute. Lateral margins finely curved. Basal margin trisinuate, emarginate before scutellum, posterior angles nearly orthogonal. Surface coarse, finely covered with large punctures, each puncture bearing a long seta, punctures at anterior and posterior portions smaller than those at discal parts; surface near apical angles granulated. Longitudinal impression distinct but shallow, about 1 / 3 length of pronotum, widest at middle; sublateral carinae from base to about 2 / 3 of the pronotum, apical 3 / 4 curved. Prosternal process (Fig. 4 D) with rounded apex, disc distinctly wrinkled, finely covered with small punctures, each puncture bearing a short seta, lateral sides of prosternal process microreticulated.

Elytra (Fig. 4 C) more than twice as long as wide, subparallel in basal 3 / 5, surface coarse, lateral margins crenulated. Each elytron with granulate carinae on strial intervals 5, 7, and 8; other intervals flat. Area from interval 5 to lateral margin covered with short setae. Hind wings well developed. Apical portion of elytra distinctly granulated.

Mesothorax (Fig. 4 D), transverse, surface of disc covered with sparse short setae, and irregular impressions, middle of anterior portion hidden by prosternal process, sides of disc partly covered with plastron setae. Metaventrite (Fig. 4 D), disc shiny, covered with small, sparse punctures, each bearing a long seta, without plastron setae, sides covered with plastron setae. Median sulcus long and distinct, extending from posterior margin to c. 4 / 5 of metasternum, widest at base and becoming narrower anteriorly, base of median sulcus with a deep impression. Areas along coxal cavities and posterior margin with a series of shallow and anomalous impressions.

Disc of ventrites I – IV and anteriorly middle of ventrite V shiny, covered with sparse small punctures, without plastron setae; other areas of ventrites covered with plastron setae. Posterior margin of ventrite IV (Fig. 4 E – F) with a small triangular projection at middle. Apical area of ventrite V granulated, apical margin distinctly emarginate at middle.

Legs simple, femora swollen, surface covered with plastron setae; inner half of tibiae with cleaning fringes; tarsi slightly shorter than tibiae; tarsal claws simple.

Aedeagus (Fig. 5 A – C), very slender and elongate, median lobe nearly asymmetrical, apical portion curved, with apex nearly triangular. Sternite IX (Fig. 5 D) with apical margin rounded, with a tuft of short setae at middle.

Measurements (N = 3): CL: 3.12–3.44 mm; HW: 0.58–0.62 mm; PL: 0.88–0.97 mm, PW: 0.98–1.05 mm; EL: 2.20–2.56 mm, EW: 1.31–1.46 mm.

Female: externally similar to the male, projection of ventrite IV (Fig. 4 G – H) weaker than in male, rounded, apex of sternite V rounded. Ovipositor as in Fig. 5 E – G, stylus curved at base, apex with several finger-like sensilla; apex of coxite roundly broadened at outer margin, with several short sensilla; valvifer longer than coxite, fibula weakly curved at middle, base weakly expanded. Measurements (N = 2): CL: 3.04–3.10 mm; HW: 0.52–0.56 mm; PL: 0.84–0.86 mm, PW: 0.93–0.96 mm; EL: 2.20–2.24 mm, EW: 1.32–1.34 mm.

Distribution.

China: Yunnan Province.

Biology.

All adults were collected from a small ravine stream (Fig. 6 D).

Etymology.

The specific epithet “ lipingae ” honors our friend and colleague Dr Ping Li (Guizhou University), one of the collectors of this new species.

Comparative diagnosis.

Zaitzevia lipingae sp. nov. can be readily distinguished from all other known Zaitzevia species by the presence of a distinct projection on ventrite IV and the very long and slender aedeagus.

List of Chinese Zaitzevia species

1. Zaitzevia acuta Bian & Hu, 2024 (Guangdong)

2. Zaitzevia babai Nomura, 1963 (Taiwan)

3. Zaitzevia chenzhitengi Jiang & Wang, 2020 (Sichuan, Shaanxi, Yunnan)

4. Zaitzevia fengtongzhaiensis Jiang & Chen, 2023 (Sichuan)

5. Zaitzevia fodingshanus Jiang & Chen sp. nov. (Guizhou)

6. Zaitzevia formosana Nomura, 1963 (Taiwan)

7. Zaitzevia gaoligongensis Bian & Zhang, 2022 (Yunnan)

8. Zaitzevia lipingae Jiang & Chen sp. nov. (Yunnan)

9. Zaitzevia muchenae Bian & Zhang, 2022 (Yunnan)

10. Zaitzevia nanlingensis Bian & Hu, 2024 (Guangdong, Hunan)

11. Zaitzevia parallela Nomura, 1963 (Taiwan)

12. Zaitzevia triangularis Peng, Bian & Wang, 2024 (Shanxi)

13. Zaitzevia reniformis Bian & Zhang, 2022 (Yunnan)

14. Zaitzevia sichuanensis Jiang & Chen, 2023 (Sichuan)

15. Zaitzevia tangliangi Jiang & Wang, 2021 (Hubei)

16. Zaitzevia tsushimana Nomura, 1963 (Jilin; Japan; Korea; Russia)

17. Zaitzevia xiongzichuni Jiang & Wang, 2020 (Yunnan)

18. Zaitzevia yingzuijieensis Jiang & Chen, 2023 (Hunan)