Omaliopsis planata, Shavrin, 2025

Omaliopsis planata sp. nov.

( Figs 1–5 View FIGURES 1–5 )

Type material examined. Holotype ( Fig. 1 View FIGURES 1–5 ; dissected; a plastic plate with the aedeagus, abdominal tergite VIII, sternite VIII, and the apical segment in Canada balsam was pinned under the card with the beetle): ‘ NEPAL (Prov. Bagmati) | below Thare Pati | 3300m, 10.VI.81 | Löbl & Smetana 188 [handwritten]’ <printed>, ‘HOLOTYPE | Omaliopsis | planata sp. n. | Shavrin A.V. des. 2025’ ( CNC) .

Description. Measurements (in mm): maximum width of head including eyes: 0.47; length of head (from base of labrum to posterior constriction along head midline): 0.32; ocular length (longitudinal): 0.15; length of temple: 0.05; length of antenna: 0.62; length of pronotum: 0.43; maximum width of pronotum: 0.52; minimum width of pronotum (basal portion): 0.42; sutural length of elytra (length of elytra from apex of scutellum to posterior margin of sutural angle): 0.71; maximum width of elytra: 0.72; length of metatibia: 0.35; length of metatarsus: 0.23 (length of metatarsomeres 1–4: 0.08; length of metatorsemere 5: 0.15); maximum width of abdomen: 0.65; length of aedeagus (from base to apex of median lobe): 0.57; total length of body (from anterior margin of clypeus to apex of abdomen): 3.06.

Body narrow, with somewhat flattened forebody ( Fig. 1 View FIGURES 1–5 ). Body reddish-brown, with distinctly paler elytra and apical part of abdomen (mediobasal part of elytra indistinctly darkened); antennomeres 6–11 brown; mouthparts, antennomeres 1–5 and legs yellowish. Punctation of head fine and dense, denser in middle, posterior parts of infraorbital portions without punctures; neck with fine and sparse punctation; punctation of pronotum dense, about as that in middle part of head, sparser in lateral portion, and finer and sparser in mediobasal third; apical part of scutellum with two fine punctures; elytra with dense and fine punctation, finer around scutellum and along suture; abdominal tergites with very fine and sparse punctation. Forebody glossy; clypeus with dense transverse microsculpture, middle portion with indistinct isodiametric meshes, infraorbital portions with diagonal and transverse microsculpture, indistinct on impunctate parts; neck and scutellum with dense transverse microreticulation; elytra without meshes; abdominal tergites with dense isodiametric microsculpture. Frontal part of clypeus and postocular portions with several long erect setae; lateral edges of pronotum with short and sparse setation; lateral surface of each elytron with several moderately short and erect setae; anterior and posterior margins of pronotum, and posterior margin of elytra with row of very short cuticular fringe.

Head 1.4 times as broad as long, with flattened middle and indistinctly elevated infraorbital portions; anteriomedian depressions wide and relatively deep, reaching level of apical margins of eyes. Temples three times shorter than longitudinal length of eyes, with obtuse and relatively large postocular ridges, each with distance between posterior margin of eye and ridges about as diameters of four ommatidia. Anteocellar foveae narrow, sublinear, reaching level of posterior third of eyes. Eyes large and convex. Ocelli large, located at level of postocular ridges, distance between ocelli slightly shorter than distance between ocellus and posterior margin of eye. Maxillary palpi moderately long, apical palpomere about three times as long as preapical segment, from basal third gradually narrowed toward subacute apex. Antennes short, reaching basal margins of elytra when reclined, with distinctly transverse antennomeres 6–10; apical six antennomeres with strong pubescence; basal antennomere more than twice as long as broad, antennomere 2 slightly narrower and distinctly shorter than basal antennomere, 3 slightly narrower than 2, 4 twice shorter than 3, about as long as broad, 5 slightly longer and broader than 4, 6 longer and broader than 5, 7–9 slightly longer and broader than 6, 10 slightly longer than 9, apical antennomere 1.5 times as long as 10, from apical third strongly narrowed toward subacute apex.

Pronotum flattened, 1.2 times as broad as long, slightly broader than head, widest in anterior portion, gradually narrowed posteriad toward obtuse posterior angles; apical margin slightly concave in middle, shorter than rounded posterior margin; surface of disc with two indstinct long and wide depressions; lateral margins marginated; lateral portion narrowly and laterobasal portion broadly impressed respectively.

Elytra about as long as broad, 1.6 times as long as pronotum, parallel-sided, indistinctly broadened in posterior parts; lateral margins marginated; hind margins somewaht straight. Hind wings fully developed.

Metatrsi 1.5 times as long as metatibia.

Abdomen slightly convex, narrower than elytra, with two small oval tomentose spots in middle of abdominal tergite IV and narrow palisade fringe on apical margin of abdominal tergite VII.

Male. Posterior margin of abdominal tergite VIII truncate ( Fig. 4 View FIGURES 1–5 ). Posterior margin of abdominal sternite VIII widely and deeply sinuate ( Fig. 5 View FIGURES 1–5 ). Aedeagus with wide basal portion, gradually narrowed toward moderately wide median lobe; apical part of median lobe gradually narrowed toward rounded apex; parameres narrow, slightly broadened apically, reaching level of apex of median lobe, each with two short apical and one preapical setae; internal sac wide and moderately short ( Fig. 2 View FIGURES 1–5 ). Lateral aspect of the aedeagus as in Fig. 3 View FIGURES 1–5 .

Female unknown.

Comparative notes. Based on the general shape of the body and the aedeagus, O. planata sp. nov. is similar to Chinese O. amplimaculata Shavrin, 2019 (Sichuan) and O. bimaculata Shavrin, 2019 (Yunnan). The new species can be distinguished from them by the narrower and more flattened forebody, darker coloration of the elytra, the shape of the temples with stronger postocular ridges, broader apical part of the median lobe, narrower apical portions of the parameres and details of the morphology of the aedeagus.

Distribution. The new species is known only from the type locality in Bagmati, Nepal.

Bionomics. The holotype was collected at elevation 3300 m a.s.l. Detailed biological data are unknown.

Etymology. The specific epithet is the Latin adjective planatus, - a, - um (flattened). It alludes to the flattened forebody.