Hydrosmittia
Creators: name: Zhang, Ruilei
name: Liu, Wenbin
name: Ferrington, Leonard C.
name: Wang, Xinhua
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Hydrosmittia

description: Key to known male imagines of Hydrosmittia
(modified from Ferrington & Saether, 2011)
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 & Arakawa)
- 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 swell- ing of inner margin of gonocoxite........................................................................ 2
2. Costa not extended................................................................................... 3
- Costa extended, often with additional false vein............................................................. 4
3. AR about 0.35, R4+5 ending proximal to apex of M3+4, lateral spinules of virga fused and sclerotized; Canada ................................................................................................... H. setaven a (Saether)
- AR about 0.15, R4+5 ending distal to apex of M3+4, lateral spinules of virga not strongly sclerotized; Palaearctic............................................................................................... H. brevicornis Strenzke
4. Anal point parallel-sided for most of its length, about 46 µm long; Norway ............... H. aagaardi Ferrington& Saether
- Anal point triangular, 0–43 µm long...................................................................... 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; Tanzania .................................... H. tenuistylata Ferrington& Saether
– Gonostylus not tapering............................................................................... 7
7. Tergite I–III and most of VI and VII pale; Tanzania .................................. H. annulata Ferrington& Saether
– No pale tergites; Tanzania ......................................................... H. soelii Ferrington& Saether
8. Inner verticals (1–2) conspicuous; accessory lobe of inferior volsella adpressed to gonocoxite; gonostylus with more or less well developed outer heel...............................................................................9
- 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;...................... 10
9. Virga consisting of a weak triangular median plate and lateral spinules; Holarctic and Oriental China. H. oxoniana (Edwards)
- Virga consisting of a sclerotized mace-like structure bearing 9 thorn-like spinules and a ventral median spine; Oriental China ........................................................................................ H. spinata sp. n.
10. False vein continuing from R4+5, conspicuous, making the costal extension indistinguishable in most specimens, LR1 0.46– 0.54............................................................................................... 12
- False vein indistinct.................................................................................. 11
11. AR 2.02, wing length 2.3 mm; Japan ........................................... H. kisotriangulata (Sasa& Kondo)
- AR 0.18–1.37, wing length 1.2–2.7 mm LR1 0.38–0.45; Holarctic................... H. ruttneri (Strenzke et Thienemann
12. AR 0.91–1.11, total length 3.16–4.17, wing length 2.13–2.67mm, virga consisting of a weak median plate with 18–30 lateral spinules; Kenya ........................................................... H. falsicostata Ferrington& Saether
- AR 0.18–0.20, total length 1.98–2.43, wing length 1.10–1.43, virga consisting of a weak triangular median plate and 9 thorn- like spinules; Oriental China ............................................................ H. continalinea sp. n.
description: Published as part of Zhang, Ruilei, Liu, Wenbin, Ferrington, Leonard C. & Wang, Xinhua, 2016, Two new species of genus Hydrosmittia Ferrington & Saether (Diptera: Chironomidae) from China, pp. 167-174 in Zootaxa 4121 (2) on pages 172-173, DOI: 10.11646/zootaxa.4121.2.6, http://zenodo.org/record/267436