Hydrosmittia, Ferrington Jr & Saether, 2011

Ferrington Jr, Leonard C. & Saether, Ole A., 2011, A revision of the genera Pseudosmittia Edwards, 1932, Allocladius Kieffer, 1913, and Hydrosmittia gen. n. (Diptera: Chironomidae, Orthocladiinae) 2849, Zootaxa 2849 (1), pp. 1-314 : 106

Key to male imagines of Hydrosmittia gen. n.

1. Phallapodeme with well sclerotized hook-like apical projection ending in 2–3 distinct, sharp teeth; virga apparently without lateral groups of spinules; superior volsella barely indicated; Japan..... H. togadistalis (Sasa, Watanabe et Arakawa) (p. 111)

– Phallapodeme without hook-like apical projection or if present very weekly sclerotized; virga consisting of median single spine, sometimes difficult to distinguish, and two rows of lateral spinules superior volsella absent or indicated as basal swelling of inner margin of gonocoxite............................................................................ 2

2. AR 0.15–0.35, costa not extended......................................................................... 3

– AR 0.38–2.02, costal extension 9–103 µm long, often with additional false vein.................................... 4

3. AR about 0.35, R 4+5 ending proximal to apex of M 3+4, lateral spinules of virga fused and sclerotized ( Fig. 40 E ); Canada................................................................................... H. setaven a (Saether)(p. 116)

– AR about 0.15, R 4+5 ending distal to apex of M 3+4, lateral spinules of virga not strongly sclerotized ( Fig. 35 D ); Palaearctic............................................................................... H. brevicornis Strenzke (p. 107)

4. Anal point parallel-sided for most of its length, about 46 µm long, gonostylus widest at apex with well developed heel ( Fig. 50 F ); Norway...................................................................... H. aagaardi sp. n. (p. 139)

– Anal point triangular, 0–43 µm long; gonostylus with or without heel............................................ 5

5. Transverse sternapodeme without oral projections, inner verticals present......................................... 6

– Transverse sternapodeme with oral projections, inner verticals present or absent.................................... 8

6. Gonostylus tapering to narrow apex ( Fig. 37 E ); Tanzania................................ H. tenuistylata sp. n. (p.111)

– Gonostylus not tapering................................................................................ 7

7. Tergite I–III and most of VI and VII pale; Tanzania....................................... H. annulata sp. n. (p. 114)

– No pale tergites; Tanzania............................................................ H. soelii sp. n. (p. 112)

8. Inner verticals (1–2) conspicuous, up to 40–60 µm long; accessory lobe of inferior volsella adpressed to gonocoxite; gonostylus with more or less well developed outer heel ( Fig. 42 F ); AR 0.38–0.71; Holarctic....... H. oxoniana (Edwards) (p. 120)

– Inner verticals absent, or if occasionally present as in some specimens of H. ruttneri short and inconspicuous; accessory lobe of inferior volsella well developed, usually free at apex; gonostylus without distinct outer heel; AR 0.44–2.02..............9

9. False vein indistinct, AR 2.02, wing length 2.3 mm, LR 1 0.47; Japan.......... H. kisotriangulata (Sasa et Kondo) (p.109)

– False vein indistinct or conspicuous, AR 0.44–1.37, wing length 1.2–2.7 mm ..................................... 10

10. False vein continuing from R 4+5, conspicuous, making the costal extension indistinguishable in most specimens, wing length 2.1–2.7 mm, LR 1 0.46–0.50; Kenya................................................ H. falsicostata sp. n. (p. 134)

– False vein indistinct and evanescent, wing length 1.2–1.8 mm, LR 1 0.38–0.45; Holarctic.............................................................................................. H. ruttneri (Strenzke et Thienemann) (p. 129)

Figures

FIGURE 35. Hydrosmittia brevicornis (Strenzke) comb. n. A—male wing; B—thorax; C—hypopygium, left dorsal aspect, right ventral aspect; D—virga; E—pupa, posterior tergites; F—pupa, posterior sternites.

FIGURE 37. Hydrosmittia tenuistylata sp. n., male. A—wing; B—head; C—antepronotum; D—virga; E—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 40. Hydrosmittia setavena (Saether) comb. n., male. A—wing; B—head; C—third palpomere; D—cibarial pump and stipes; E—virga; F—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 42. Hydrosmittia oxoniana (Edwards) comb. n., male. A—wing; B—head; C—third palpomere; D—cibarial pump and stipes; E—virga; F—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 50. Hydrosmittia aagaardi sp. n., male. A—wing; B—head; C—third palpomere; D—cibarial pump and stipes; E— virga; F—hypopygium, left dorsal aspect, right ventral aspect.