Beckidia connexa, Zorina, Oksana V., 2006

Zorina, Oksana V., 2006, New species and records of Beckidia Saether (Diptera: Chironomidae) from the Russian Far East, Zootaxa 1151, pp. 47-53 : 50-52

Beckidia connexa new species

( Figs. 3–5 )

Type material: Holotype: male, RUSSIA, Khabarovsk Territory, Amur River opposite of Khabarovsk, 11.viii.2004, T. Tiunova. Paratypes: 1 male, label as holotype; 2 males, Amur River Basin, Tunguska River near Nikolaevka Village, 1.viii.2003, O. Zorina; 1 male, Amur River Basin, Bidzhan River near Preobrazhenovka Village, 4.viii.2003, T. Tiunova.

Etymology: From Latin connexa , fused, referring to the structure of the superior and inferior volsellae.

Diagnostic characters

The new species can be separated from other species of Beckidia by the following combination of characters: Total length 3.2–3.5 mm; AR 1.78; tergites I–IV (V/VI) with brown transverse band along distal margin; acrostichals absent; anal point widest at about apical one­third; superior volsella with microtrichia and fused with inferior volsella; gonostylus widest at about apical one­third.

Male (n = 4)

Total length 3.2–3.5 mm. Wing length 1.6–1.8 mm. Total length/wing length 2.0–2.06.

Coloration. Scapus brown on dorsal side and yellow on ventral side, flagellomeres dark brown; ground color of thorax pale yellow, mesonotal strips yellow, two­third of postnotum yellowish brown; front leg yellowish brown, except for distal two­thirds of ti and ta1–5 brown; mid and hind legs with yellow femur and tibia, ta1–5 gradually darker toward apex; abdomen yellowish with brown transverse bands along distal margin of tergites I–IV, sometimes tergites V and VI also with brown bands, tergite IX brownish.

Head. Frontal tubercle absent. Verticals 7–9. Clypeus with 9–10 setae. Antenna 950 m long, AR 1.78. Maxillary palp 509–545 m long, lengths of segments II–V (in m): 50, 113, 135–158, 207–225. Palp length/head width 1.03–1.10; antenna length/palp length 1.74–1.80.

Thorax. Antepronotals 0, acrostichals 0, dorsocentrals 7–9, prealars 3–4, supraalars 1. Scutellum with 3–4 setae.

Wing. Width 0.51–0.55 mm. VR 1.10–1.15. R and R1 without setae, R4+5 with 2 apical setae, brachiolum with 2 setae. Squama with 5–7 setae.

Legs. Combs of mid and hind tibiae with 2 spurs, 23 m long. Length and proportions of legs as in Table 2 .

Hypopygium ( Figs. 3–5 ). Anal tergite bands of H­type. Anal point spatulate, 50 m long, 14 m wide, placed preapically on tergite IX. Laterosternite IX with 1–3 setae. Transverse sternapodeme 36 m long. Gonocoxite 90–104 m long, with 5–7 setae.

Superior volsella pad­like, 45–50 m long, 36 m wide, with 10–12 setae and microtrichia, fused with inferior volsella. Gonostylus 144–158 m long, 32–41 m wide, curved, widest at about distal one­third. HR 0.62–0.66.

Distribution

Known from the type locality only, the Amur River Basin.

Figures

FIGURES 1 – 7. Male imagines of Beckidia biraensis new species (1 – 2), Beckidia connexa new species (3 – 5) and Beckidia tethys (Townes) (6 – 7). 1, 3, 6. Hypopygium. 2, 5, 7. Superior and inferior volsella. 4. Anal point. Scale bars: 50 m.

Tables

TABLE 2. Length (in m) and proportions of legs of Beckidia connexa new species, male (n = 4).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	SV	BV	BR
P1	703– 722	456– 475	798– 855	380– 399	323– 361	247– 266	133– 152	1.75– 1.80	1.38– 1.45	1.75– 1.81	2.2– 2.4
P2	665	494– 513	323	152– 171	114– 133	95	76– 86	0.63– 0.65	3.59– 3.65	3.06– 3.39	2.6– 4.0
P3	760– 779	741– 760	494	266– 285	228– 266	152– 162	114	0.65– 0.67	3.08	2.44– 2.65	3.0– 3.7