Beckidia biraensis, 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 : 48-50

Beckidia biraensis new species

( Figs. 1–2 )

Type material: Holotype: male, RUSSIA, Khabarovsk Territory, Amur River Basin, Bira River, 4 km from Zheltyei Jar Village, 12–15.viii.2004, T. Tiunova.

Etymology: From the type locality Bira River, and the Latin suffix ­ ensis denoting locality.

Diagnostic characters

The new species can be separated from other species of Beckidia by the following combination of characters: Total length 5.0 mm; AR 2.71; tergites yellowish; scutum with 4 acrostichals; anal point long, narrow and parallel­sided; dorsolateral part of superior volsella without microtrichia; gonostylus widest medially.

Male (n = 1)

Total length 5.0 mm. Wing length 2.5 mm. Total length/wing length 2.0.

Coloration. Scapus yellowish brown, flagellomeres dark brown; thorax pale yellow, with mesonotal stripes and two­third of postnotum yellow; front leg yellowish brown except for distal one­third of tibia, distal half of ta1 and ta2–5 brown; mid and hind leg with femur yellowish brown and ta1–5 gradually darker towards apex; abdomen yellowish.

Head. Frontal tubercle absent. Verticals 12–13. Clypeus with 10 setae. Antenna 1482 m long, AR 2.71. Maxillary palp 554 m long; lengths of segments II­V (in m): 59, 113, 158, 225. Antenna length/palp length 2.68.

Thorax. Antepronotals 0, acrostichals 4, dorsocentrals 9, prealars 3–4, supraalars 1. Scutellum with 5 setae.

Wing. Width 0.74 mm. VR 1.11. R with 2–3 setae, R1 without setae, R4+5 with 4 apical setae, brachiolum with 2–3 setae. Squama with 5–7 setae.

Legs. Combs of mid and hind tibiae each with 2 spurs, 23 m long. Length and proportions of legs as in Table 1 .

Hypopygium ( Figs. 1–2 ). Anal tergite bands of Y­type. Anal point long and narrow, 108 m long, 9 m wide, placed preapically on tergite IX. Laterosternite IX with 3 setae. Transverse sternapodeme 45 m long. Gonocoxite 135 m long, with 6–7 setae. Superior volsella pad­like, 50–54 m long, 45–54 m wide, with 13 setae, with microtrichia except in dorsolateral part. Inferior volsella projecting but not lobe­like, 126 m long. Gonostylus 180 m long, 41 m wide, slightly curved, widest medially. HR 0.75.

Distribution

Known from the type locality only, Bira River in 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.