Paratrichodromeus angustilobatus, Shavrin, 2024

Shavrin, Alexey V., 2024, New species and records of Hygrodromicus Tronquet, 1981 and Paratrichodromeus Zerche, 1992 from the Middle Asia, the Himalayan Region and China (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 5446 (2), pp. 236-246 : 243-245

Paratrichodromeus angustilobatus sp. n.

( Figs. 10–12 , 15 )

Type material examined. Holotype ♂ ( Fig. 12 ; dissected): ‘NE-Afghanistan, 2008 | Shiwa Lake, 2800–2900 m | 37°14’/ 70°58’E | 19.–21. VII., C. Reuter’ <printed>, ‘ HOLOTYPE | Paratrichodromeus | angustilobatus sp. n. | Shavrin A.V. des. 2024’ <red, printed> (cF, to be eventually deposited in NME).

Redescription. Measurements: HW: 0.85; HL: 0.65; OL: 0.17; TL: 0.15; AL: 2.64; PL: 0.77; PWmax: 0.97; PWmin: 0.81; ESL: 1.32; EW: 1.52; MTbL: 1.10; MTrL: 0.61 (MTrL 1–4: 0.31; MTrL 5: 0.30); AW: 1.49; AedL: 1.22; BL: 5.75.

Body narrow, elongate and moderately convex ( Fig. 12 ). Body reddish-brown, with distinctly paler apical portion of elytra and abdominal tergites III–V; antennae brown, with paler basal parts of antennomeres 1–5; mouthparts and legs yellow-brown (tarsi slightly paler). Body glossy; head with fine microsculpture, fine and dense in middle of vertex, very dense and irregular in middle, and dense and isodiametric on infraorbital portions; neck with dense and coarse isodiametric microsculpture; pronotum with fine and dense transverse microreticulation, invisible in middle; scutellum with very fine isodiametric meshes in middle, lateral portions of visible parts of scutellum without any sculpture; abdomen with dense transverse microreticulation.

Head 1.3 times as broad as long, with distinctly elevated medioapical portions between bases of antennae and infraorbital portions; supra-antennal protuberances moderately wide, strongly elevated; medioapical depression wide and very deep, narrowing posteriad and connected with moderately deep and narrow subrectangular interocellar depression; anteocellar foveae narrow, subdiagonally stretching anteriad toward level of anterior third of eyes; temples convex, long, slightly shorter than longitudinal length of eyes. Eyes moderately small, convex. Ocelli reduced. Punctation irregular, finer and sparser in middle and larger and denser on infraorbital portions; basal portions of vertex without sculpture. Preapical segment of maxillary palpi about as long as preceding segment, from middle gradually narrowed toward acute apex. Antennae reaching about middle length of elytra when reclined; basal antennomere about three times as long as wide, antennomere 2 slightly narrower and distinctly shorter than basal antennomere, 3 slightly shorter and narrower than 2, 4 slightly shorter than 3, 5–6 slightly longer than 4, 7 slightly longer and indistinctly broader than 6, 8–10 slightly shorter and broader than 7, apical antennomere slightly shorter than previous two antennomeres, from apical third gradually narrowing toward subacute apex.

Pronotum 1.2 times as broad as long, slightly broader than head, from widest anterior portion gradually narrowed posteriad toward obtuse posterior angles; laterobasal margins indistinctly concave; anterior margin rounded, about as long as slightly concave posterior margin; mediobasal portion with indistinct, small and oval impression. Punctation dense and fine, distinctly sparser in middle and meddiobasal portion.

Scutellum without punctation.

Elytra slightly broader than long, 1.7 times as long as pronotum, distinctly broadened posteriad, with very wide apical margins. Punctation about as that on pronotum, denser and deeper in basal and significantly finer and sparser in middle portion. Wings fully developed.

Metatarsus slightly less than twice as long as metatibia; apical metatarsomere slightly shorter the preceding four metatarsomeres.

Abdomen slightly narrower than elytra, with two wide and transverse tomentose spots in the middle of abdominal tergite IV and indistinct two very small and transverse spots in the middle of tergite V; apical margin of abdominal tergite VII without distinct palisade fringe. Punctation regular, fine and dense, distinctly finer on abdominal tergite IV.

Male. Apical margin of abdominal tergite VIII rounded. Apical margin of abdominal sternite VIII sinuate. Aedeagus with wide basal portion, gradually narrowed toward median lobe with moderately wide apical part gradually narrowed toward small rounded apex; parameres narrow, distinctly exceeding apex of median lobe, with small two apical and two preapical setae; internal sac with elongate sclerotized structures in middle and moderately long flagellum ( Fig. 10 ). Lateral aspect of the aedeagus as in Fig. 11 .

Female unknown.

Comparative notes. Paratrichodromeus angustilobatus sp. n. can be reliably distinguished from P. punctulatus ( Luze, 1904) and P. sukranensis Zerche, 1992 only by the shape of the narrower apical portion of the aedeagus and different structure of the internal sac.

For illustrations of the aedeagi of the compared species see Figs 9, 10 in Zerche (1992).

Distribution. The species is known only from the type locality in north-eastern Afghaninstan ( Fig. 15 ).

Bionomics. The specimen was collected at elevation 2800–2900 m a.s.l. The detailed bionomical data are unknown.

Etymology. The specific epithet is a combination of Latin adjective angustus, - a, - um (narrow) and lobatus, - a, - um (lobed). It refers to the moderately narrow apical part of the median lobe of the aedeagus.

Figures

FIGURE 15. Distribution of Paratrichodromeus in Central Asia: P. angustilobatus (triangle), P. punctulatus (circles), P. sukranensis (squares).

FIGURES 6–11. Aedeagus of Hygrodromicus (Figs. 6–7: H. klapperichi, Figs. 8–9: H. latilobatus (holotype)) and Paratrichodromeus (Figs. 10–11: P. angustilobatus): 6, 8, 10—parameral view, 7, 9, 11—lateral view. Scale bar: 0.1 mm.

FIGURES 12–14. Habitus of Paratrichodromeus: 12—P. angustilobatus (holotype), 13—P. punctulatus (Tajikistan, Hissar Mts.), 14—P. sukranensis (Kyrgyzstan, Trans-Alay Range). Scale bars: 1.0 mm.