Heterlimnius luyashanensis, Peng & Bian & Wang, 2024

Peng, Yun-Fei, Bian, Dong-Ju & Wang, Ju-Ping, 2024, Heterlimnius luyashanensis sp. n. and Zaitzevia triangularis sp. n. from Shanxi Province, China (Coleoptera: Elmidae), Zootaxa 5403 (4), pp. 488-494 : 489

Heterlimnius luyashanensis sp. n.

( Figs. 1A–E ; 2A–C )

Type material: holotype, male ( IAECAS): “ CHINA: Shanxi / Xinzhou City / Luya Mountains | 111.885272°E 38.729431°N / 2401 m, VIII. 13. 2021 / Leg. Peng.” Paratypes: 13 males, 3 females ( IAECAS), the same data as holotype; 4 males, 4 females ( SIH): “ CHINA: Shanxi / Xinzhou City / Luya Mountains | 111.875278°E 38.693611°N, 1920 m / VIII. 14. 2021 / Leg. Peng” .

Diagnosis. The new species should be included in the Heterlimnius trachys species group which has the following characteristics: 1. Anterior margin of pronotum is strongly produced anteriad. 2. Sublateral carinae developed in basal half. 3. Pronotum with a median longitudinal sulcus extending from basal 0.3 to 0.8. This species is similar to H. quadrigibbus Kamite, 2012 in habitus, but it can be distinguished from the latter by its median longitudinal sulcus shorter which extends from basal 0.3 to 0.8, sublateral carinae more developed which extend from base to 0.5, pronotum with a pair of prescutellar pits, while in H. quadrigibbus , median sulcus of pronotum extends from basal 1/3 to apex, sublateral carinae extend from base to basal 0.3, pronotum without prescutellar pits.

Description. BL 3.1 mm, EW 1.4 mm (holotype). Habitus see figs.1A–B. Dorsal surface black, but ventral surface, femora, tibiae brown to dark brown. Antennae, tarsi and claws yellowish brown.

Head mostly retracted into the prothorax. Labrum micro-reticulate in basal 1/3, smooth and shiny in distal 2/3, anterior margin is truncate, with long setae laterally. Clypeal suture straight, indistinct. Frons coarse, densely pubescent. Antennae 11 antennomeres, the first two antennomeres inflated, the 3rd to 8th antennomeres small, and the last three antennomeres elongated and inflated.

Pronotum see fig.1C. PL 0.85 mm, PW 1.0 mm. Pronotum subparallel in basal 0.4, then distinctly attenuated anteriorly, slightly convex, with a deep and wide sulcus extending from basal 0.3 to 0.8. Sublateral carinae present in basal 0.5. Disc densely punctate and pubescent, lateral area coarse and weakly granulate. Base with a pair of elongated prescutellar pits. Anterior margin strongly produced anteriad.

Elytra see fig.1E. Elytra elongate oval, moderately convex. Intervals slightly rugose and convex. Striae deep, strial punctures small and deeply punctate. Basal part of the third interval wider than the fourth. Intervals densely pubescent.

Prosternal process (fig. 1D) distinctly narrowed from base to apex; apex rounded; surface coarse, densely granulate and pubescent; lateral margins distinctly elevated. Disc of metaventrite slightly impressed, rugose, densely pubescent.

All of the five ventrites densely pubescent with metallic luster. Apex of ventrite V evenly rounded with some spinate setae.

Aedeagus (figs. 2A–C). 0.6 mm long. Penis long and slim, overreaching the parameres, not abruptly dilated at basal third, the apex narrowly rounded; apical part curved ventrad in lateral view. Parameres broad in basal third, then distinctly narrowed in distal 2/3, the apices narrowly rounded; paramere about 0.8 times as long as penis.

Males: BL 2.9–3.1 mm, EW 1.4–1.5 mm (n=13).

Females: BL 3.0– 3.1 mm, EW 1.50–1.55 mm (n=3). Similar to the male.

Distribution. China: Shanxi.

Etymology. This species is name after Luyashan which is the type locality of the new species in Shanxi Province.

Figures

FIGURE 1. Heterlimnius luyashanensis sp. n.A. Habitus, holotype, male in dorsal view B. Habitus, in ventral view C. Pronotum D. Prosternal process E. Elytra.

FIGURE 2. Aedeagus, holotype, male, Heterlimnius luyashanensis sp. n. A. in ventral view B. in dorsal view C. lateral view.