Hygrodromicus latilobatus, 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 : 241-242

Hygrodromicus latilobatus sp. n.

( Figs 3 , 8–9 )

Type material examined. Holotype ♂ ( Fig. 3 ; dissected): ‘ NEPAL Rasuwa Dis. | Langtang Kh[ola]. Vall. | Forest Camp 1900m | 13.IV.[19]85 A. Smetana’ <printed>, ‘ HOLOTYPE | Hygrodromicus | latilobatus sp. n. | Shavrin A.V. des. 2024’ <red, printed> ( CNC).

Paratypes: 3 ♂♂ (dissected; one specimen without left antennomeres 9–11 and right antennomeres 4–11; one specimen without right apical antennomere), 1 ♀: same data as the holotype, with additional red printed label : ‘ PARATYPE | Hygrodromicus | latilobatus sp. n. | Shavrin A.V. des. 2024’ (2 ♂♂: cSh; 1 ♂, 1 ♀: CNC) .

Description. Measurements (n=5): HW: 0.77–0.88; HL: 0.47–0.58; OL: 0.16–0.22; LT: 0.08–0.12; AL (holotype): 3.48; PL: 0.63–0.88; PWmax: 0.95–1.11; PWmin: 0.84–0.88; ESL: 1.40–1.51; EW: 1.65–1.78; MTbL (holotype): 1.22; MTrL (holotype): 0.50 (MTrL 1–4: 0.23; MTrL 5: 0.27); AW: 1.50–1.82; AedL: 0.83–0.94; BL: 4.20–4.70 (holotype: 4.45).

Habitus as in Fig. 3 . Body yellow-brown to reddish-brown; mouthparts, antennae and legs yellow-brown. Head with regular, dense and moderately fine isodiametric microreticulation; neck with large and coarse isodiametric sculpture; pronotum with dense isodiametric microsculpture similar to that in head, slightly transverse in lateroapical portions and finer in middle in two paratypes; scutellum with dense transverse microsculpture; abdomen with dense transverse microreticulation.

Head 1.5–1.6 times as broad as long, with markedly elevated portions between bases of antennae and slightly convex infraorbital portions; supra-antennal proturberances moderately wide and strongly elevated; medioapical depression deep and wide, narrowing posteriad toward wide and deep subrectangular interocellar depression; anteocellar foveae narrow, long and deep, reaching level of anterior third of eyes; temples convex, about twice as long as longitudinal length of eyes. Eyes moderately small, convex. Ocelli small, but well visible, located slightly below level of posterior margins of eyes, distance between ocelli slightly longer than distance between ocellus and posterior margin of eyes. Punctation dense, moderately large and deep, sparser in middle and distinctly denser on infraorbital portions. Apical segment of maxillary palpi short, distinctly twice shorter than preapical segment. Antenna very long, almost reaching apical margins of elytra when reclined; basal antrennomere wide, distinctly more than three times as long as broad, antennomere 2 narrower and shorter than basal antennomere, 3 distinctly longer than 2, 4–8 distinctly longer than 3, 9–10 slightly broader than 8, apical antennomere 1.3–1.4 times as long as 10.

Pronotum 1.2–1.5 times as broad as long, 1.2 times as broad as head, widest in anterior portion, strongly narrowed posteriad toward obtuse or subacute posterior angles, with slightly and narrowly elevated longitudinal band in middle; posterior margin somewhat rounded, slightly narrower than straight posterior margin. Punctation dense, about as that in head, sparser in middle and/or mediobasal third; narrow longitudinal band without punctures.

Scutellum with fine and very sparse punctation.

Elytra flattened, slightly broader than long, about twice as long as pronotum or slightly shorter, significantly broadened posteriad, with widely rounded apical margins. Punctation dense, slightly larger, deeper and sparser than that on pronotum, finer around scutellum and along suture. Wings fully developed.

Metatarsus more than twice shorter than metatibiae; apical antennomere slightly longer than preceding four metatarsomeres.

Abdomen narrower than elytra, with two moderately small and transverse tomentose spots in the middle of abodminal tergite IV; apical margin of abdominal tergite VII with very narrow indistinct palisade fringe. Punctation dense and fine.

Male. Protarsomeres 1–4 wide.Apical margin of abdominal tergite VIII straight or somewhat rounded.Aedeagus with very wide median lobe, strongly narrowed toward narrow apical part, and gradually narrowed toward rounded apex; parameres narrow, significantly longer than apex of median lobe, with four moderately short apical setae; internal sac without sclerotized structures, with very long flagellum, spirally folded in basal portion ( Fig. 8 ). Lateral aspect of the aedeagus asi n Fig. 9 .

Female. Protarsomeres 1–4 narrow. Apical margins of abdominal tergite VIII and sternite VIII rounded.

Comparative notes. Based on the general shape of the body and the aedeagus, H. latilobatus sp. n. is similar to H. amnicola (Champion, 1920) , known from Pakistan and India ( Shavrin 2021), from which it can be distinguished by the narrower and longer elytra, significantly narrower apical portion of the median lobe, and longer parameres.

Distribution. Hygrodromicus latilobatus sp. n. is known only from the type locality in Rasuwa District, central Nepal.

Bionomics. The detailed bionomical data are unknown.

Etymology. The specific epithet is a combination of Latin adjective latus, - a, - um (broad) and lobatus, - a, - um (lobed). It refers to the distinctly broadened median lobe of the aedeagus.

Figures

FIGURES 1–5. Habitus:1—Geodromicus palpalis (paratype), 2—Hygrodromicus klapperichi (Afghanistan), 3—H. latilobatus (holotype), 4—H. reitteri (Kyrgyzstan, Issyk Kul), 5—H. wrasei (Tajikistan, Hissar Mts.). Scale bar: 1.0 mm.

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.