Geodromicus magnus Shavrin, 2020

Cheng, Zhi-Fei, Shavrin, Alexey V. & Peng, Zhong, 2020, New species and records of Geodromicus Redtenbacher, 1857 from China (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4789 (1), pp. 132-170 : 147-148

Geodromicus magnus Shavrin sp. n.

( Figs. 54–56 , 113 )

Type material examined: Holotype ♂: ‘ CHINA: | B.M. 1980–491 | P.M. Hammond’ <rectangular label, printed>, ‘ SHAANXI: ca 20 m. S.Xi’an [Ƌờ] | Cuihua Shan [ẒṪƜ] | 19.ix.[19]80’ <rectangular label, printed>, ‘by stream’ <rectangular label, handwritten>, ‘ HOLOTYPE | Geodromicus | magnus sp. n. | Shavrin des. 2019’ <red rectangular label, printed> ( BMNH).

Paratypes (10 ♂♂, 13 ♀♀): 10 ♂♂ [three specimens dissected], 13 ♀♀: same data as the holotype, ‘ PARA- TYPE | Geodromicus | magnus sp. n. | Shavrin des. 2019’ <red rectangular label, printed> (1 ♂: CS; 9 ♂♂, 13 ♀♀: BMNH) .

Description. Measurements (min-max; n=24): HW: 0.90–1.10; HL: 0.65–0.75; OL: 0.30–0.36; LT: 0.12–0.16; AL (holotype): 3.12; PL: 0.90–1.10; PWMax: 1.10–1.35; PWMin: 0.70–0.90; ESL: 1.80–2.00; EW: 1.70–2.00; MTbL (average): 1.25; MTrL (average): 0.62 (MTrL 1–4: 0.35; MTrL 5: 0.27); AW: 1.75–2.05; AedL: 0.95; BL: 5.51–7.45 (holotype: 6.42).

Forebody brown to black; antennomeres 3–11 and abdomen brown; scutellum reddish-brown to brown with black lateral margins; legs and antennomeres 1–2 yellow-brown to reddish-brown (sometimes apical part of femora brown to black); mouthparts, basal portions of antennomeres 1–6 and tarsi yellow to yellowish-brown. Body glossy, without microsculpture on forebody except for middle portion of head between margins of eyes and interocellar depression with very indistinct transverse meshes; abdomen glossy, with fine transverse microreticulation, more distinct in abdominal tergites IV–V. Habitus as in Fig. 54 .

Head 1.3–1.4 times as wide as long, slightly convex in middle and on infraorbital ridges, with deep transverse antero-median depression narrowing apicad and sometimes indistinctly connected with interocellar depression; temples slightly less than half as long as eyes; interocellar depression deep and moderately narrow, separated from infraorbital ridges by convergent and deep latero-anteriad grooves in front of ocelli. Eyes large, strongly convex. Ocelli large, distance between ocelli approximately subequal to distance between ocellus and posterior margin of eye. Punctation deep and irregular, coarser on infraorbital ridges. Preapical segment of maxillary palp slightly shorter than preceding segment, markedly widened apicad; apical palpomere about 0.7 times as long as preapical segment, widest in middle, gradually narrowing apically. Antennae long, reaching posterior third of elytra; antennomeres with lengths × widths (holotype): 1: 0.37 × 0.12; 2: 0.22 × 0.08; 3: 0.30 × 0.08; 4–5: 0.26 × 0.10; 6–9: 0.27× 0.10; 10: 0.26 × 0.10; 11: 0.37 × 0.10.

Pronotum markedly convex, 1.2 times as wide as head and long, widest slightly above middle, gradually narrowed anteriad and more sharply posteriad; anterior angles rounded; basal part of pronotum with slightly concave lateral margins and obtuse posterior angles; anterior and posterior margins straight; mediobasal third with distinct, small and deep depression, some paratypes with indistinct longitudinal impression in middle. Punctation regular, moderately large and deep, interspaces between punctures as broad as average diameter of three or four nearest punctures, mediobasal portion of several paratypes without punctures.

Scutellum large, without punctures.

Elytra convex, as wide as long, approximately twice as long as pronotum, indistinctly widened posteriad. Punctation larger and deeper than that of pronotum, but slightly sparser.

Metatarsi about half as long as metatibia; apical metatarsomere slightly shorter than the preceding four metatarsomeres.

Abdomen slightly wider than elytra, markedly convex, with two small, transverse tomentose spots in the middle of abdominal tergite IV. Punctation distinct, regular, fine, and deep.

Male. Protarsomeres 1–4 markedly wide; profemora slightly widened. Apical margin of abdominal tergite VIII straight. Apical margin of abdominal sternite VIII sinuate. Aedeagus ( Fig. 55 ) with small basal portion and moderately narrow and long median lobe, gradually narrowed towards rounded apex; parameres moderately wide, slightly widened apically, not exceeding apex of median lobe, with four long apical setae; internal sac with short and relatively wide flagellum. Lateral aspect of aedeagus as in Fig. 56 .

Female. Protarsomeres 1–4 narrow; profemora not widened. Apical margins of abdominal tergite VIII and sternite VIII slightly rounded.

Comparative notes. Based on the structure of the internal sac, G. magnus sp. n. belongs to the plagiatus group ( Bordoni 1984). Regarding the coloration, punctation of the pronotum, length of the antennae, and the shape of the pronotum it is similar to G. paramerus and G. sinuatus (Sharp, 1889) from Japan. It can be distinguished from G. paramerus by the larger body, coarser and deeper punctation of the head and elytra, a wider median lobe, and significantly narrower parameres. It differs from G. sinuatus by the narrower elytra and median lobe, and wider parameres. From both species, G. magnus differs by a more glossy forebody, by the elytra less widened posteriad, and by different shape of the internal structure of the aedeagus.

Distribution. The species is known only from the type locality in Cuihua Shan range in Shaanxi, China ( Fig. 113 ).

Bionomics. Bionomic data are unknown.

Etymology. The specific epithet is the Latin adjective magnus [large]. It refers to the moderately large body of the species.

Figures

FIGURE 113. Distribution of 21 species of Geodromicus in China: 1–G. abdominalis, 2–G. amplissimus, 3–G. aokii, 4–G. beibienkoi, 5–G. chinensis, 6–G. cupreostigma, 7–G. formosanus, 8–G. frigidus, 9–G. hammondi, 10–G. lestevoides, 11–G. magnus sp. n., 12–G. namucuoicus sp. n., 13–G. ohkurai, 14–G. philydroides, 15–G. shii sp. n., 16–G. sibiricus, 17–G. sinuatocollis, 18–G. sinuatus, 19–G. smetanai, 20–G. subquadratus sp. n., 21–G. taiwanensis.

FIGURES 54–56. Male of Geodromicus magnus sp. n. (paratype): 54–habitus, 55–aedeagus, parameral view, 56–aedeagus, lateral view. Scale bar: 2.00 mm (Fig. 54), 0.2 mm (Figs. 55–56).