Abiskomyia levanidovi, Makarchenko, Eugenyi A. & Makarchenko, Marina A., 2015

Makarchenko, Eugenyi A. & Makarchenko, Marina A., 2015, Review of the genus Abiskomyia Edwards (Diptera: Chironomidae: Orthocladiinae), with description of new taxa from the Russian Far East and bordering territories, Zootaxa 3919 (1), pp. 41-60 : 43

Key to species and subspecies of Abiskomyia Edwards

Males

1. Gonostylus with megaseta. Hind tibial comb absent. AR 0.85.............................. A. paravirgo Goetghebuer - Gonostylus without megaseta. Hind tibial comb present or absent. AR different.................................... 2 2. Hind tibial comb present. Gonostylus nearly parallel-sided or wide in basal part and strongly narrowed in apical part. LR1

0.57–0.58 or 0.75–0.76................................................................................. 3 - Hind tibial comb absent. Gonostylus smoothly tapered from base to apex. LR1 0.62–0.65............................ 5 3. Scutum yellowish, with 3 dark brown vittae. Acrostichals numerous (19–23), beginning from antepronotal border and also sit-

uated in light oval area on midline posterior to middle (Fig. 28). Gonostylus 116–120 µm long....... A. levanidovi sp. nov. - Scutum brown or dark brown, without vittae. Acrostichals 1–9, situated only in light oval area on midline posterior to middle.

Length of gonostylus different........................................................................... 4 4. Antennal plume reduced. AR 0.39–0.43. LR1 0.57–0.58. Laterosternite IX with 13–18 setae. Gonostylus 144–152 µm long,

nearly parallel-sided and with short preapical crista dorsalis................................... A. korbokhon sp. nov. - Antennal plume well developed. AR 1.02–1.13. LR1 0.75–0.76. Laterosternite IX with 3–7 setae. Gonostylus 100–104 µm

long, wide in basal part and strongly narrowed in apical part, without crista dorsalis.................... A. rivalis sp. nov. 5. Antenna 720–768 µm long. Palp with 4 (sometimes with 3) palpomeres. Wing 2.1–2.2 mm long; anal lobe slightly reduced.

BR3 1.7–1.9. Apex of rod-shaped part of inferior volsella round............................... A. virgo virgo Edwards - Antenna 960–1056 µm long. Palp with 5 palpomeres. Wing 2.6–2.7 mm long; anal lobe well developed. BR3 3.1–4.1. Apex of

rod-shaped part of inferior volsella sloped.......................................... A. virgo orientalis subsp. nov.

Pupae

1. Anal lobe projection in form of weakly sclerotized apical tubercle, without teeth or sometimes with 2–3 blunt teeth 28–48 µm long............................................................................... A. korbokhon sp. nov. - Anal lobe projection well sclerotized, with well developed apical teeth or with apical and lateral teeth................... 2 2. Thoracic horn flat, yellowish and covered with small spinules (males) or almost without spinules (females) (Fig. 32). Anal lobe projection with 4–8 lateral teeth and 3–4 teeth in apex (Figs. 30–31). Cephalic tubercle length 16–20 µm ... A. levanidovi sp. nov............................................................................ A. paravirgo Goetghebuer - Thoracic horn slender, with pointed apex, covered with large spinules. Anal lobe projection with different structures. Cephalic tubercle length 24–96 µm.............................................................................. 3 3. Anal lobe projection with ribbed surface and with short weak apical teeth, 80–116 µm long (males) and 64–96 µm (females) ( Fig. 56 ). All dorsocentrals of thorax branched. Length of frontal apotome setae 247–260 µm........... A. rivalis sp. nov. - Anal lobe projection smooth, with filamentous teeth, 28–52 µm long (males) ( Figs. 57–58 ). Dc4 simple. Length of frontal apotome setae 160–190 µm............................................................................... 4 4. Thoracic horn length 304–368 µm (males); anal lobe length/anal lobes width 0.77–1.00; anal lobe projection length 28–52 µm (males)............................................................................ A. virgo virgo Edwards - Thoracic horn length 384 µm (males); anal lobe length/anal lobes width 0.68; anal lobe projection length 92 µm (males)................................................................................ A. virgo orientalis subsp. nov.

Larvae of fourth instar

1. S I of labrum large and palmate, divided into 16–20 branches (Fig. 37). Labral lamella rounded. Third antennal segment without style............................................................................... A. levanidovi sp. nov. 1 - S I of labrum large, oval and fine plumose on the edge into numerous branches (Figs.15, 49). Shape of labral lamella different. Third antennal segment with style in distal part.............................................................. 2 2. Labral lamella with rounded anterior edge and small notch in the middle (Figs. 15, 25). Premandible with weakly divided into two apical teeth and outer apical tooth much narrower of inner tooth (Fig. 16). Projection of antennal pedestal 52–60 µm long; AR 1.50–1.65....................................................................... A. korbokhon sp. nov. - Labral lamella triangular (Figs. 49, 62). Premandible with two good separated subequal apical teeth (Fig. 50). Projection of antennal pedestal 36–40 µm long; AR 1.86–2.14.............................................. A. rivalis sp. nov.

1 A. paravirgo Goetghebuer probably keys here.

Figures

FIGURES 56 – 62. Abiskomyia rivalis sp. nov., pupa (56) and larva (59 – 62); A. virgo virgo Edwards, pupa (57 – 58). 56, anal segment and apex of anal lobe (in upper right corner) of male; 57, anal segment of male; 58, apex of anal lobe; 59 – 61, mentum; 62, labral lamella.