Lesteva (s.str.) jaechi Shavrin, 2017

Shavrin, Alexey V., 2017, New species and records of Lesteva Latreille, 1797 from China (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4306 (1), pp. 108-120 : 114

Lesteva (s.str.) jaechi Shavrin , sp.n.

(Figs. 15–16, 24)

Type material examined: Holotype ♂ [The last abdominal segment was glued under the beetle; a plastic card with a preparation of the aedeagus in Canadian balsam was pinned under the card with specimen]: CHINA: GUNAGDONG PROVINCE: ‘CHINA: Guangdong Prov. [Shaoguan Prefecture, Yangshan County] | Nanling N[ational].P[ark]., [Chengjia Nature Reserve] Yao Shan [below peak of Shikengkong Mountain] | 4.11.2001, ca. 1750 m | [M.] Jäch & [A.] Komarek (CWBS 467)’ <rectangular label, printed>, ‘HOLOTYPE | Lesteva (s.str.) | jaechi sp.n. | Shavrin A.V. det. 2017’ <red rectangular label, printed> (NMW).

Paratype, 1 ♂: same data as the holotype, with my additional label ‘PARATYPE | Lesteva (s.str.) | jaechi sp.n. | Shavrin A.V. det. 2016’ <red rectangular label, printed> (NMW).

Description. Measurements (n=2): WH: 0.54–0.56; LH: 0.40; LA (holotype): 1.30; LE: 0.15¯0.17; LT: 0.08¯0.10; LP: 0.55; WPMax: 0.60–0.61; WPMin: 0.40; LEl: 1.08–1.10; WE: 0.96–1.07; WA: 0.90¯0.95; LAed: 0.43; TL: 2.75(holotype)–2.88.

Body and antennae yellowish brown, middle portion of head reddish brown; apical margin of scutellum and each elytron with wide reddish-brown macula, extending from shoulder toward suture in middle of elytra; basal parts of antennomeres 1̄6, mouthparts, legs and paratergites yellow. Punctation of head coarse, denser on infraorbital ridges; punctation of pronotum regular, slightly deeper and denser than that in middle potion of head, interspaces between punctures as diameter of 1-2 nearest punctures; scutellum with very small punctures; punctation of elytra deeper and sparser than that on pronotum; abdominal tergites with fine sparse punctures, distinctly denser on abdominal tergite V and slightly larger on abdominal tergite VII. Body covered by moderately long slightly outstanding white pubescence. Body glossy, without microsculpture. Habitus as in Fig. 24 .

Head 1.3̄1.4 times as wide as long, with slightly convex vertex and moderately wide longitudinal impressions between middle portion and infraorbital ridges; eyes moderately large and convex, 1.7¯1.8 times as long as temples abruptly narrowing toward neck; ocelli large, distance between ocelli subequal to distance between ocellus and posterior margin of eye. Antennae reaching one third of elytra when reclined, with thickened antennomeres; measurements of antennomeres (length/width, holotype): 1: 0.15 × 0.07; 2: 0.12 × 0.05; 3¯4: 0.10 × 0.04; 5¯7: 0.11 × 0.04; 8¯10: 0.10 × 0.06; 11: 0.20 × 0.07.

Pronotum small and narrow, convex, about as wide as head and long, widest in anterior third portion and gradually narrowed toward parallel latero-basal margins, with obtuse hind angles; disc of pronotum with two indistinct wide longitudinal impressions beginning from apical third portion and extending toward basal margin.

Elytra wide, about twice as long as pronotum, with rounded hind margins and with distinct wide transverse impression in basal third.

Metatarsus two and half times shorter than metatibia, with tarsomere I as long as tarsomere II and slightly shorter than apical tarsomere.

Abdomen slightly narrower than width of elytra; tergite IV and V with paired tomentose spots, significantly larger in tergite IV.

Male. Apical margin of abdominal sternite VIII with widely rounded emargination. Aedeagus narrow (Fig. 15), with median lobe gradually narrowing toward somewhat sharp apex; parameres narrowing apically, short, reaching apical third of median lobe of aedeagus, with four short apical setae; median part of endophallus with short field of sclerotized thorns. Aedeagus laterally as in Fig. 16.

Female unknown.

Comparative notes. Based on the shape of maculae on the elytra, puncturation of the forebody and shape of the aedeagus, the new species is similar to L. huabeiensis Rougemont, 2000 (Beijing, China), but differs by the smaller body, narrower pronotum, longer median lobe of the aedeagus and narrower parameres. Besides that, based on the coloration of the forebody and by the presence of similar maculae on the elytra, proportions of antennomeres and general shape of the aedegus, L. jaechi sp.n. is similar to Japanese L. shikokuana Watanabe, 1990 (Shikoku) and L. shibatai Watanabe, 1990 (Honshu) , but differs by the smaller body and narrower aedeagus.

Distribution. The new species is at present known only from the type locality in the Yao Shan range in Guangdong, China.

Etymology. The species is named after coleopterologist Manfred A. Jäch (Wien), a specialist on water beetles, one of collectors of the type specimens.

Figures

FIGURE 24 – 25. Habitus of Lesteva: 24 — L. jaechi sp. n., paratype, 25 — L. schoenmanni sp. n., paratype. Scale bar: 1.0 mm.