Abiskomyia rivalis Makarchenko et Makarchenko
- Dataset
- Review of the genus Abiskomyia Edwards (Diptera: Chironomidae: Orthocladiinae), with description of new taxa from the Russian Far East and bordering territories
- Rank
- SPECIES
- Published in
- 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): 41-60, DOI: 10.11646/zootaxa.3919.1.2
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Insecta
- order
- Diptera
- family
- Chironomidae
- genus
- Abiskomyia
- species
- Abiskomyia rivalis
diagnosis
Diagnosis. See the keys.
etymology
Etymology. The species is named from Latin rivalis – living in stream. Ecology. Pupae and larvae were collected from stones in mountain stream covered with moss, with water temperatures 0.4 – 0.8 ° C.
materials_examined
Material. Holotype: adult male, Russian Far East, Magadan Region, Ten’kinskyi District, Olen’ Stream (upper stream of Kolyma River), about 3 km from Sibit-Tyellakh Village, 25. VI. 1977, leg. E. Makarchenko. Paratypes: 1 adult male and 2 males extracted from mature pupae, 1 pupa and 2 pupal exuviae, 1 larva and 3 larval skins taken from pupae, same data as holotype; 1 pupa with larval skin, 4 larvae, East Siberia, Republic of Buryatia, Severobaikalskyi (North Baikal) District, Davsha River (Baikal Lake basin), 5. VII. 2000, leg. L. Kravtsova. Adult male (n = 2) Total length 3.4 – 3.6 mm. Wing length 2.28 – 2.52 mm. Total length / wing length 1.43 – 1.49. Colouration brown, wing grey. Head. Temporal setae 9 – 11, including outer verticals and postorbitals, inner verticals absent. Clypeus massive, with 13 – 14 setae. Antenna with 13 flagellomeres and well developed plume; AR 1.02 – 1.13. Palp with 5 palpomeres. Palpomere length (in µm): 28 – 32, 52 – 56, 80 – 92, 68 – 72, 92 – 104. Thorax. Brown. Antepronotum with 3 – 7 lateral setae. Acrostichals 1 – 4, only in lightly coloured oval area; dorsocentrals 8 – 11 (in 1 row); prealars 3 – 4; scutellars 16. Wing. R with 4 – 6 setae, R 1 with 2 setae, R 4 + 5 with 2 – 3 setae subapically. Apex of R 4 + 5 distal of apex M 3 + 4. Cu 1 straight. Costa extension absent. Anal lobe rectangular-rounded. Squama with 18 – 20 setae. Legs. Spur of fore tibia 56 – 60 µm. Spurs of mid tibia 40 – 48 µm long, of hind tibia 64 – 68 µm and 42 – 44 µm long. Hind tibial comb with 11 setae. Length and proportions of leg segments as in Table 3. Hypopygium (Fig. 39). Tergite IX with 19 – 26 long setae; anal point narrow, subparallel-sided, slightly widened apically and bare. Laterosternite IX with 3 – 7 setae on each side. Transverse sternapodeme without oral projections. Gonocoxite 224 – 244 µm long; inferior volsella as in Fig. 39. Gonostylus 100 – 104 µm long, widest in basal two-thirds, strongly narrowing towards tip, apical part slightly curved inwards, covered with few long setae in outer part, without crista dorsalis, megaseta absent. Pupa (n = 3). Total length 4.5 – 4.6 mm. Cephalothorax. Frontal setae simple, 244 – 260 µm long, arising from cephalic tubercles on frontal apotome, 32 – 40 µm long. Frontal apotome and cephalic tubercles covered with small tubercle-like spines. Thoracic horn brown 320 – 336 µm long, tapering to pointed apex and covered with spinules (Fig. 40). Nearest of thoracic horn 3 branched precorneals: Pc 1 with 6 – 14 branches, Pc 2 with 9 – 14 branches, Pc 3 with 5 – 6 branches. Median two antepronotals with 2 – 4 branches and 9 – 10 branches. Lateral antepronotal setae not observed (replaced with pore). Three dorsocentrals in group and Dc 4 slightly distant; Dc 1 with 5 – 9 branches, Dc 2 with 2 – 5 branches, Dc 3 with 4 – 8 branches, Dc 4 with 3 – 4 branches. Abdomen. Shagreenation of tergites as in A. levanidovi but spines along posterior edge of tergites III – V located in smaller brown spots at base. PSA present on sternites IV – VII. Segment I without lateral setae. Segments II – VI with 3 pairs of lateral setae and one pore, segment VII with 2 pairs of lateral setae. Segment VIII with 0 – 1 pair of lateral setae. Anal lobe 288 – 304 µm long and 400 – 416 µm wide, with light brown chitinized projection 60 – 100 µm long, with 2 – 3 spinules in apex and with 0 – 5 weakly developed spinules in lateral part (Figs. 41 – 44, 56). Male genital sac extending beyond anal lobe and apex of anal lobe projection (Figs. 45, 56). FIGURES 46 – 55. Abiskomyia rivalis sp. nov., larva of fourth instar. 46, seta submenti; 47, antenna; 48, distal part of antenna; 49, S I and labral lamella; 50, distal part of premandible; 51 – 52, 54 – 55, mentum; 53, distal part of mandible. Figs. 46, 51 – 55 — 50 µm; Figs. 48 – 50 — 20 µm. Fourth instar larva (n = 2). Total length 4.5 mm. Head. Head capsule dark-brown, postoccipital margin black. S I of labrum large, oval and finely plumose on edge, S II simple and strong, S III small and hair-like, S IV short and spinous. Labral lamella dark brown, triangular (Figs. 49, 62). Premandible with two well separated subequal apical teeth, and with two inner teeth shorter than apical teeth (Fig. 50); brush developed and consisted of simple long spines. Antenna with 5 segments, located on pedestal with pointed projection 36 – 40 µm long; segment 4 and 5 of similar size; two ring organs in basal part of segment 1, distal ring organ with long seta; one lauterborn organ on apex of second segment and one on apex of third segment; blade ending at middle part of segment 4; style 8 µm long, placed on subapical part of segment 3 (Figs. 47 – 48); AR 1.86 – 2.14. Mandible brown, with 4 teeth, apical tooth shorter than combined width of 3 inner teeth; seta long, tapering to pointed apex (Fig. 53); seta interna with 4 plumose branches. Pecten galearis developed but sometimes not visible. Median tooth of mentum with a flat top (probably slightly ground off), with the first pair of lateral teeth slightly lighter than other four pairs of lateral teeth; first pair of lateral teeth smallest and located at base of middle part of median tooth; ventromental plate broad, subtriangular; covered with small spines (Figs. 51 – 52, 54 – 55, 59 – 61); setae submenti plumose, split into 4 – 5 branches, sometimes branched at apex (Fig. 46). Anal tubules short and roundish at apex. Procercus dark, sclerotized, nearly as long as wide, bearing 7 – 8 apical anal setae of different length: 1 seta 464 – 560 µm long, 2 setae 320 – 368 µm long, 3 setae 224 – 240 µm long and 1 – 2 setae 112 – 120 µm long. Body with simple and branched setae.