Dicranota ( Dicranota ) guerini Zetterstedt, 1838

Dicranota ( Dicranota) guerini Zetterstedt, 1838 View in CoL

Figs 9–15 View Figures 9–15 , 79 View Figures 77–93

Dicranota guerini Zetterstedt, 1838: 851; Lundström 1912: 65; Edwards 1921: 225; Meijere 1921: 26; Pierre 1924: 137; Czižek 1931: 175; Lackschewitz 1940: 111, 113; Fahy 1972: 260–263. View in CoL

? Dicranota galactoptera Alexander, 1927: 5–6 View in CoL .

Dicranota ( Dicranota) guerini View in CoL : Edwards 1938: 59; Coe 1950: 137; Starý and Rozkošný 1970: 101.

Examined material

(Fig. 79 View Figures 77–93 ). North Korea • 1 ♀ (pinned); Chonsani ; alt. 1219 m; 29 April 1940; A. M. Yankovsky leg.; USNM • 3 ♂ (pinned); Chonsani ; alt. 1524 m; 26 June 1940; A. M. Yankovsky leg.; USNM • 5 ♂ (pinned, genitalia in microvials with glycerol on same pins); Chonsani ; alt. 1067 m; 27 June 1940; A. M. Yankovsky leg.; USNM • 5 ♂ (pinned, genitalia in microvials with glycerol on same pins); Chonsani ; alt. 1219 m; 27 June 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Chonsani ; alt. 1067 m; 29 June 1940; A. M. Yankovsky leg.; USNM • 2 ♀ (pinned); Chonsani ; alt. 1219 m; 1 July 1940; A. M. Yankovsky leg.; USNM • 2 ♂ (pinned); Chonsani ; alt. 1524 m; 4 July 1940; A. M. Yankovsky leg.; USNM • 1 ♀ (pinned); Chonsani ; alt. 1219 m; 4 July 1940; A. M. Yankovsky leg.; USNM • 2 ♂, 1 ♀ (pinned); Pontani Paiktusan ; alt. 1372 m; 17 July 1940; A. M. Yankovsky leg.; USNM • 3 ♂ (pinned); Pontani Paiktusan ; alt. 1676 m; 28 July 1940; A. M. Yankovsky leg.; USNM • 2 ♂ (pinned); Pontani Paiktusan ; alt. 1524–1829 m; 28 July 1940; A. M. Yankovsky leg.; USNM • 4 ♂ (pinned, genitalia of 1 ♂ in microvial with glycerol on same pin); Pontani Paiktusan ; alt. 1676 m; 31 July 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1676–1920 m; 1 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Chonsani ; alt. 1067 m; 5 August 1940; A. M. Yankovsky leg.; USNM • 2 ♂ (pinned); Pontani Paiktusan ; alt. 1890 m; 5 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1890 m; 6 August 1940; A. M. Yankovsky leg.; USNM • 1 ex. (pinned, tip of abdomen broken); Pontani Paiktusan ; 6 August 1940; A. M. Yankovsky leg.; USNM • 2 ♂, 1 ex. (pinned, tip of 1 ex. abdomen broken); Pontani Paiktusan ; alt. 1768–1942 m; 8 August 1940; A. M. Yankovsky leg.; USNM • 1 ♀ (pinned); Pontani Paiktusan ; alt. 1829 m; 8 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1859 m; 8 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1859 m; 9 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Pontani Paiktusan ; alt. 1920 m; 10 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1859 m; 10 August 1940; A. M. Yankovsky leg.; USNM • 3 ♂ (pinned, genitalia of 1 ♂ in microvial with glycerol on same pin); Pontani Paiktusan ; alt. 1890 m; 10 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Pontani Paiktusan ; alt. 1942 m; 13 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1829 m; 17 August 1940; A. M. Yankovsky leg.; USNM • 2 ♀ (pinned); Pontani Paiktusan ; alt. 1920 m; 18 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1920 m; 20 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned); Pontani Paiktusan ; alt. 1942 m; 23 August 1940; A. M. Yankovsky leg.; USNM • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Pontani Paiktusan ; alt. 1829–1942 m; 24 August 1940; A. M. Yankovsky leg.; USNM • 1 ♀ (pinned); Pontani Paiktusan ; alt. 1829–1942 m; 27 August 1940; A. M. Yankovsky leg.; USNM ; Mongolia • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Bayan-Olgiy Aimag, Nogoonnuur Soum, Zakhin Us Gol, 15 km W Nogoonnuur ; 49.57774°N, 90.03497°E; alt. 1764 m; 8–9 July 2010; S. Podenas leg.; MAIS 2010070803 ( ANSP) GoogleMaps • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Uvs Aimag, Turgen Soum Springs S side of Khondlon Gol, 6 km W Turgen ; 50.07458°N, 91.60140°E; alt. 1316 m; 14 July 2010; S. Podenas leg.; MAIS 2010071401 ( ANSP) GoogleMaps • 1 ♂ (pinned, genitalia in microvial with glycerol on same pin); Uvs Aimag, Turgen Soum, Javartain Gol & Turgen Gol, 33 km SW Turgen ; 49.89234°N, 91.35239°E; alt. 1849 m; 16–17 July 2010; S. Podenas leg.; MAIS 2010071602 ( ANSP) GoogleMaps .

Redescription.

General body colouration greyish brown densely covered with grey pruinosity. Body length of male 7.0– 7.5 mm, of female 7.6–9.0 mm. Wing length of male 7.1–8.5 mm, of female 9.3–9.5 mm.

Head. Densely dusted with greyish brown pruinosity, covered with short erect yellowish setae posteriorly, naked frontally. Eyes widely separated in both sexes, distance between them at base of antennae exceeds length of both basal antennomeres taken together. Antenna 2.7–3.3 mm long in male, reaching posterior margin of first abdominal segment if bent backwards, 1.5 mm in female, reaching slightly before middle of presutural scutum if bent backwards. Whole antenna uniformly dark brown, scape elongate, nearly twice as long as wide, pedicel subglobular. Flagellum 11 - segmented in male, 10 - segmented in female. Male flagellomeres elongate, nearly cylindrical, ~ 4 × as long as wide, decreasing in length towards apex of antenna, densely covered with short, dense and erect light grey pubescence. Basal female flagellomere elongate, remaining segments oval, pubescence very short. Verticils dark brown, short, ≤ 0.5 × as long as width of flagellomere in male, as long as width of flagellomere in female. Rostrum brown dusted with grey, palpus pale brown to brown in male, darker in female. Labellum pale brown.

Thorax. Cervical sclerites yellowish brown. Pronotum brownish grey covered with erect greyish setae. Presutural scutum densely covered with brownish grey pruinosity, with three distinct dark brown stripes. Median stripe wide, separated along middle by very narrow light vitta. Lateral stripe short. Stripes without darker margins. Tubercular pit and pseudosutural fovea indistinct. Scutal lobe dark brown laterally, grey medially. Area between scutal lobes pale grey posteriorly. Scutellum greyish frontally, brownish posteriorly. Mediotergite greyish with narrowly pale brown frontal margin and darker posterior part. Pleuron uniformly brownish grey, darker brown where pruinosity has been denuded. Prothoracic spiracle surrounded by pale brown membrane. Wing (Figs 9–11 View Figures 9–15 ) long and narrow, widest at tip of vein CuP, translucent, strongly iridescent with light brownish tinge. Stigma distinct, elongate, brown to dark brown. Distinct dark spot surrounds base of R 5 and cross-vein r-m. Indistinct darker area surrounds base of Rs. Veins dark brown, pale at wing base. Venation: Sc long, reaching level of stigma, sc-r far before base of Rs, close to the level of tip of anal vein, but position slightly varies individually from before tip of A 1 (Fig. 9 View Figures 9–15 ) to slightly beyond it (Figs 10 View Figures 9–15 , 11 View Figures 9–15 ). Rs medium long, more often arched at base (Fig. 9 View Figures 9–15 ), but it could be angulate and short-spurred (Figs 10 View Figures 9–15 , 11 View Figures 9–15 ), or angulate without spur. Free end of R 1 longitudinal, as long or shorter than R 2. Vein R 2 transverse, at distal margin of stigma, supernumerary cross-vein in cell r 1 at frontal margin of stigma. R 3, R 4, and R 5 nearly parallel to each other distally. Cell r 3 with short stem. Cross-vein r-m distinct, discal cell open by atrophy of m-m vein, closed in rare occasions. Cell m 1 usually missing or very small, length slightly varies, sometimes missing on one wing, but present on other. Cross-vein m-cu slightly beyond branching point of M, CuP straight, anal vein slightly arched, nearly straight. Anal angle widely rounded. Length of male halter 0.9–1.1 mm, of female 1.1 mm. Stem of halter pale brownish grey with pale base, knob slightly infuscate. Coxae greyish pale brown or brownish yellow, fore and middle coxae darker brown at base, more darkened frontally. Trochanters brownish yellow with slightly darkened distal margin. Femora brownish with pale base, distal margin not darker than remainder of femur. Tibiae and basal tarsomeres brown, distal tarsomeres dark brown. Male femur I: 4.4–5.0 mm long, II: 4.5–4.9 mm, III: 4.8–5.3 mm, tibia I: 4.3–4.8 mm, II: 4.2–4.7 mm, III: 4.9 mm, tarsus I: 6.3–7.3 mm, II: 6.3 mm, III: 6.4–6.6 mm. Female femur III: 4.9 mm long, tibia III: 4.9 mm. Claw simple, without spines.

Abdomen. Tergites of male abdomen dark brown with narrowly pale yellow posterior and lateral margins and widely yellow postero-lateral corners, leaving only narrow dark line between them along the middle of sclerite. Sternites with brown basal half and yellow posterior, narrowly pale grey along posterior margin. Female abdomen with less distinct pattern, tergites greyish brown, darker along middle, sternites yellowish brown. Posterior margins of segments narrowly pale.

Male terminalia (Figs 12–14 View Figures 9–15 ) brown to dark brown, not distinctly darker than preceding segments. Posterior margin of epandrium slightly concave, postero-lateral angle with small bump. Gonocoxite short and wide with large rounded setose postero-dorsal lobe better discernible in lateral view (Fig. 13 View Figures 9–15 ). Interbase long and narrow, widened subapically, tip spine-shaped. Outer gonostylus pale, unusually for the genus, long and narrow, fleshy and setose. Inner gonostylus sausage-shaped, slightly arched with bluntly rounded tip, mesal margin setose. Aedeagus (Fig. 14 View Figures 9–15 ) short with two pairs of lateral apodemes, dorsal apodemes long and narrow, making together V-shaped structure. Posterior segments of female abdomen concolourous with the rest of abdomen.

Ovipositor (Fig. 15 View Figures 9–15 ). Darkened at base. Cercus just slightly arched, blunt-apexed, distal part yellow. Hypogynial valve straight, blackish at base, distal part pale, dorsal margin with short arched setae at base. Spermatheca small and rounded.

Elevation range.

From 1000 m to nearly 2000 m.

Period of activity.

From late April through to end of August.

Habitat.

Larvae develop in small springs, rivulets, streams, and fast running medium-sized rivers with sand or gravel on the bottom. Usually more abundant in small springs and rivulets. Larvae predacious.

General distribution.

Wide-spread throughout the whole Palaearctic.

Remark.

This species is recorded from the Korean Peninsula for the first time.