Himalodromeus grandis, Shavrin, 2024

Shavrin, Alexey V., 2024, Review of Hygrogeus Mulsant & Rey, 1880 and Trichodromeus Luze, 1903, with descriptions of three new genera from the eastern Palaearctic Region (Coleoptera: Staphylinidae: Anthophagini: Omaliinae), Zootaxa 5531 (1), pp. 1-62 : 49-50

Himalodromeus grandis sp. n.

( Figs 93, 96 , 112–113 , 122 , 124 )

Type material examined. Holotype ♂ ( Fig. 93 ; dissected; left antennomeres 10–11 and 5–11 missing): ‘ Pakistan ( NWFP) | Balakot | 23-VI-1953 | F.Schmid’ <printed>, ‘ Hygrogeus | cyanipennis | Cam. | det. V. Puthz 19[printed]81’ <handwritten>, ‘ HOLOTYPE | Himalodromeus | grandis sp. n. | Shavrin A.V. des. 2024’ <red, printed> ( MHNG).

Paratype ♀ (left antenna and right antennomeres 2–11, and right fore leg missing): same data as the holotype, with additional red printed label: ‘ PARATYPE | Himalodromeus | grandis sp. n. | Shavrin A.V. des. 2024’ <red, printed> ( MHNG).

Description. Measurements (n=2): HW: 1.60–1.64; HL: 1.15; OL: 0.32–0.38; TL: 0.30; PL: 1.70–2.25; PWmax: 2.30–2.60; PWmin: 1.71–1.85; ESL: 2.65–2.75; EW: 3.10–3.45; MTbL (holotype): 3.25; MTrL (holotype): 1.28 (MTrL 1–4: 0.68; MTrL 5: 0.60); AW: 2.90–3.35; AedL: 1.60; BL: 8.25–9.45 (holotype).

Habitus as in Fig. 94 . Body dark-brown, with bluish elytra; legs brown; antennae, mouthparts and tarsi yellow-brown (apical maxillary palpomeres distinctly paler). Head with dense isodiametric microsculpture, coarser between ocelli and on neck; pronotum with dense isodiametric microsculpture, finer in mediobasal and medioapical portions; scutellum with dense and moderately coarse transverse microreticulation.

Head 1.3–1.4 times as broad as long, with slightly elevated infraorbital portions; anterio-median depression connected with slightly depressed subrectangular interocellar depression; anteocellar foveae reaching about level of middle of eyes; basal part of interocellar depression in front of ocelli with widely rounded elevation; temples slightly shorter than longitudinal length of eyes. Ocelli moderately large; distance between ocelli about as long as distance between ocellus and posterior margin of eyes. Punctation dense and large, sparser and finer in middle; mediobasal part between ocelli and neck with fine and sparse pucntation. Apical maxillary palpomere about 1.4 times as long as penultimate segment, distinctly broadened in preapical portion, with rounded apex. Antennomere 2 shorter and narrower than basal antennomere, 3 distinctly longer than 2, 4–6 slightly longer than 3 and 7–9 slightly longer than 6.

Pronotum 1.1–1.3 times as broad as long, broader slightly in front of middle, from widest part gradually narrowed anteriad and slightly more sharply narrowed posteriad; latero-apical margin distinctly concave; frontal part strongly protruded anteriad, with widely concave apical margin ( Fig. 96 ); laterobasal margins in front of obtuse hind angles moderately short, subparallel; posterior margin slightly concave; middle portion of disc with shallow and narrow longitudinal depression; mediobasal portion in front of basal margin indistinctly and widely impressed; latero-apical and lateral margins narrowly bordered, reflexed latero-apically (holotype), with smooth crenulation, stronger in holotype. Punctation about as that on head, but significantly denser, with interstices between punctures in middle about as long as diameter of nearest punctures, sparser in medioapical and mediobasal portions. Scutellum with distinct dense and moderately fine punctation.

Elytra 1.1–1.2 times as broad as long, 1.2–1.5 times as long as pronotum; disc of each elytron with distinct four narrow and elongate elevations in middle, from about mediobasal portion subdiagonally stretching posteriad toward medioapical part; lateral potion widely impressed and slightly reflexed. Punctation about as that on pronotum, but sparser, finer and denser around scutellum and along suture (paratype).

Abdomen slightly narrower than elytra.

Male. Pronotum distinctly broader and more convex. Profemora and protarsomeres 1–4 wide. Posterior margin of abdominal tergite VIII straight. Posterior margin of abdominal sternite VIII with significant deep emargination, with dense and very long setation on each latero-apical portion ( Fig. 122 ). Aedeagus with broad basal part, gradually narrowed toward moderately broad median lobe, from preapical portion strongly narrowed toward elongate and acute apex; basal portions of median lobe with long and narrow lateral sclerotized lobes, curved apically about at level of apical third of median lobe; parameres shortened, not reaching middle of median lobe, with four moderately short apical setae; internal sac without spines, with narrow elongated structures in preapical and middle portions, with long and narrow flagellum, spirally folded in basal portion and significantly broadened in basal part ( Fig. 112 ). Lateral aspect of the aedeagus as in Fig. 113 .

Female. Pronotum narrower, less convex. Profemuri and protarsomeres 1–4 moderately narrow. Posterior margin of abdominal tergite VIII and sternite VIII straight.

Comparative notes. Based on the coloration of the body and the bluish elytra, general shape of pronotum and aedeagus, H. grandis sp. n. is more similar to H. cyanipennis , from which it differs by the larger pronotum, broader slightly in front of middle, with frontal part more protruded anteriad, denser punctation of the pronotum, the presence of distinct longitudinal elevations on each elytron, the broader apical part of the aedeagus, and other details of the internal and external morphology of the aedeagus.

Distribution. Himalodromeus grandis sp. n. is known only from the type locality in north-western Pakistan ( Fig. 124 ).

Bionomics. Detailed bionomical data are unknown.

Etymology. The specific epithet is the Latin adjective grandis , -e (large). It refers to the large body of the species.

Figures

FIGURE 124. Distribution of Himalodromeus: H. cyanipennis (circles), H. grandis (square), H. reductus (triangles).

FIGURES 90–97. Habitus (Figs 90–94) and apical part of pronotum (Figs 95–97) of Himalodromeus: 90—H. cyanipennis (Uttarakhand), 91, 95—H. cyanipennis (paratype), 92—Hygrogeus cyanipennis var. atrocaeruleus (lectotype), 93, 96—H. grandis (holotype), 94, 97—H. reductus (paratype). Scale bar: 1.0 mm.

FIGURES 110–115. Aedeagus of Himalodromeus (Figs 110–111: H. cyanipennis (paralectotype), Figs 112–113: H. grandis (holotype), Figs 114–115: H. reductus (paratype): 110, 112, 114—parameral view, 111, 113, 115—lateral view. Scale bar: 0.1 mm.

FIGURES 116–123. Abdominal segments (ventral view) of Himalodromeus (Figs 116–121: H. cyanipennis; Fig. 122: H. grandis; Fig. 123: H. reductus): 116—male tergite VIII, 117, 122–123—male sternite VIII, 118—male genital segment, 119— female tergite VIII, 120—female sternite VIII, 121—female genital segment. Scale bar: 0.1 mm.