Geodromicus (s.str.) subsimilis Cameron, 1941

Shavrin, Alexey V., 2022, The bodemeyeri and the convexicollis species groups of the genus Geodromicus Redtenbacher, 1857, and additional taxonomic and faunistic data for some species of the Eastern Palaearctic Region (Coleoptera: Staphylinidae: Omaliinae), Zootaxa 5213 (5), pp. 451-496 : 491-492

Geodromicus (s.str.) subsimilis Cameron, 1941

( Figs. 70 , 76 , 82–83 )

Geodromicus subsimilis Cameron, 1941: 144

Type material examined. Holotype of Geodromicus subsimilis Cameron, 1941 , ♂: ‘Type’ <printed label with red margin>, ‘SYN- | TYPE’ <printed label with blue margin>, ‘Ghum dist. | Mangpo | v-31 | Dr. Cameron’ <printed>, ‘G. | subsimilis | TYPE [red] Cam. ’ <handwritten>, ‘M.Cameron. | Bequest. | B.M. 1955-147. ’ <printed>, ‘ Geodromicus | subsimilis Cam. [handwritten] | Shavrin A. det. 2016’ <printed> ( BMNH).

Additional material examined. INDIA: WEST BENGAL: 1 ♂: ‘ Ghum.dist. Mangpo v-[19]31 Dr. Cameron’, ‘ M.Cameron. Bequest. B.M. 1955-147.’, ‘ subsimilis Cam. ’, ‘SYNTYPE’ ( BMNH) ; 2 ♂♂: ‘ Ghum district vvi-[19]31 Dr. Cameron’ , ‘stream moss’, ‘ W. Steel coll. B. M. 1969-552.’, ‘SYNTYPE’ ( BMNH) ; 1 ♂: ‘ Ghum dist. Tiger Hill 8,500 –10,000 ft. v-vi-1931 Dr.Cameron’, ‘ Stream moss’, ‘ M.Cameron. Bequest. B.M. 1955- 147.’, ‘SYNTYPE’ ( BMNH) ; NEPAL: 1 ♀: Mechi / Taplejung, 24 km NE Taplejung, 1550 m, Sekathum, Camp , 27°32’10″N 87°48’29″E. 06.05.2003. A. Weigel leg. ( NME) .

Redescription. Measurements (n=6): HW: 0.91–0.97; HL: 0.66–0.70; OL: 0.25; TL: 0.20–0.22; AL (holotype): 3.08; PL: 1.16–1.25; PWmax: 1.20–1.35; PWmin: 0.84–0.90; ESL: 1.38–1.70; EW: 1.60–1.85; MTbL (holotype): 1.37; MTrL (holotype): 0.51 (MTrL 1–4: 0.26; MTrL 5: 0.25); AW: 1.45–1.67; AedL: 0.60–0.80; BL: 5.15–6.45 (holotype).

Habitus as in Fig. 76 . In general appearance it similar in habitus with G. (s.str.) curvipes . Body, mouthparts, antennae and legs brown to dark-brown (legs in some specimens slightly paler); tarsi yellow-brown. Head with distinct microsculpture: finer and transverse on clypeus, coarse, transverse and very dense in middle portion; pronotum with distinct and dense, transverse meshes; scutellum with fine transverse microsculpture; abdomen with fine and dense, transverse microreticulation.

Head 1.3 times as broad as long, with deep and wide, subtriangular anterio-median depression; temples convex, slightly less than longitudinal length of eyes; interocellar depression wide and deep, subrectangular or subtriangular. Punctation about as that on head, but denser.Apical maxillary palpomere distinctly shorter than preceding palpomere, from middle strongly narrowed toward subacute apex.

Pronotum very convex, slightly broader than long, from widest middle gradually narrowed both anteriad and posteriad; narrowest basal part of pronotum moderately short, subparallel; hind angles subacute; middle portion with long, moderately wide and deep longitudinal depression, deeper in middle and sometimes indistinct in medioapical and mediobasal portions; mediobasal depression transverse, shallow or indistinct, or moderately deep; apical portion of pronotum distinctly protruded apicad, with wide and slightly concave anterior margin and with distinctly bordered apical margins. Punctation very dense, about as that on head, sparser and finer in mediobasal portion in front of mediobasal depression.

Elytra 1.1–1.3 times as long as pronotum. Punctation very dense, slightly larger and deeper than that on pronotum.

Metatibia twice as long as metatarsus.

Abdomen slightly narrower than elytra.

Male. Profemuri and protarsomeres 1–4 wide; inner margins of protibia significantly and widely curved. Pronotum somewhat elongate and more convex. Apical margins of abdominal tergite VIII and sternite VIII slightly concave. Aedeagus with moderately small and narrow basal part, gradually narrowed toward median lobe; median lobe with very narrow apical portion, from apical third gradually narrowed toward subacute apex; parameres narrow, slightly broadened apically, with three moderately long apical setae; internal sac short and wide, with paired narrow elongate sclerotized structures in basal, and very long four sclerotized structures in apical portion; flagellum missing ( Fig. 82 ). Lateral aspect of the aedeagus as in Fig. 83 .

Female. Profemuri and protarsomeres 1–4 narrow; protibia without modifications. Pronotum moderately short, slightly convex. Apical margins of abdominal tergite VIII and sternite VIII rounded.

Comparative notes. Based on the general shape and the coloration of the body with the similar shape of the pronotum, the presence of microsculpture and longitudinal depression on the pronotum, the shape of the curved protibia in males, and the general shape of the aedeagus, G. (s.str.) subsimilis is similar to Indian G. (s.str.) curvipes (see above). From this species it can be distinguished by the longer body, slightly broader pronotum, coarser microsculpture on the pronotum, narrower apical portion of the median lobe and different internal morphology of the aedeagus.

Distribution. The species is known from three locations in Nepal and West Bengal, India ( Fig. 70 ).

Bionomics. Specimens were collected from 1550 to 3050 m a.s.l. The detailed bionomical data are unknown.

Remarks. Geodromicus subsimilis was originally described based on the holotype (“Type in my collection”) from “Ghum district: Mangpu: Tiger Hill, 8000–10,000 feet ”.

It is recorded here from Nepal for the first time.

Figures

FIGURE 70. Distribution of Geodromicus in the Himalayan Region: G. affinis (circles), G. alticola (squares), G. curvipes (triangle), G. ruficornis (diamond), G. subsimilis (black stars).

FIGURES 74–77. Habitus of Geodromicus: 74—G. curvipes (lectotype), 75—G. ruficornis (holotype), 76—G. subsimilis (holotype), 77—G. smetanai (China, Hailuogou). Scale bars: 1.0 mm.

FIGURES 78–83.Aedeagus of Geodromicus alticola (Figs. 78–79: India, Lianmarg), G. curvipes (Figs. 80–81: paralectotype), G. subsimilis (Figs. 82–83: India, Mangpo): 78, 80, 82—parameral view, 79, 81, 83— lateral view. Scale bars: 0.1 mm.