Hydrobaenus birulyai Krasheninnikov, 2022

Krasheninnikov, A. B. & Vshivkova, K. A., 2022, A new species of the genus Hydrobaenus Fries, 1830 (Diptera: Chironomidae) from the Arctic Russia, Far Eastern Entomologist 454, pp. 1-6 : 2-6

Hydrobaenus birulyai Krasheninnikov , sp. n.

http://zoobank.org/NomenclaturalActs/ A54D9E70-D61D-4D85-A2AF-FDD1D6338DD6

Figs 1–6

TYPE MATERIAL. Holotype – ♂, Russia: Nenets Autonomous Okrug, Yugorsky Peninsula, Pay-Khoy Range , nameless stream, a tributary of the Peschanaya

River near its estuary, 69,745056º N, 61,812861º E, h= 9 m, 16.VII 2013, leg. A.B.

Krasheninnikov (CCK). Paratypes: 1♂, Yugorsky Peninsula, Pay-Khoy Range

Amderma River, 69,726694º N, 61,715056º E, h= 6 m, 14.VII 2013, leg. A.B. Krasheninnikov (CCK); 1 ♂, Pay-Khoy Range nameless stream on the coast of the Kara

Sea, 69,765056º N, 61,753222º E, h= 5 m, 26.VII 2013, leg. A.B. Krasheninnikov

DIAGNOSIS. The new species is similar to Hydrobaenus tumidistylus Saether,

1976 but differs from latter in having anal point long, wide at apex, rounded,

without microtrichia; acrostichals 16, they situated at some distance from antepronotum; inferior volsella massive, complex shape; gonostylus with large median lobe, located medially.

DESCRIPTION. Adult male (n = 3). Total length 2.7–3.1 mm; length of abdomen 1.9–2.1 mm; wing length 1.7–1.8 mm. Ratio total length/wing length 1.60–

1.69. Head, thorax, abdomen and legs light brown.

view; 2 – hypopygium, holotype, ventral view; 3 – anal point, paratype, dorsal view; 4 –

transverse sternapodeme and virga, paratype; 5, – gonostylus, holotype; 6 – gonostylus,

paratype.

Head. Eye bare, with dorsomedial extension lacking ommatidia. Temporal setae including 2–3 inner and 4 outer verticals and 1–2 postorbitals. Antenna with partly reduced plume, AR 0.50–0.58. Clypeus with 6–12 setae. Lengths of palpomeres (in

μm): 20–24; 39–43; 78–86; 59–74; 86–94.

Thorax. Lateral antepronotals 6–9; dorsocentrals 6–8; acrostichals 16 (begin at some distance from antepronotum, weak, curved at right angles), prealars 3–4. Scu-

tellum with 6–8 setae.

Wing. R with 8–11, R 1 with 0–1, R 4+5 with 0–2 setae; other veins bare. Anal lobe slightly truncated. Costa extending to apex of R 4+5 on 16–24 μm. Squama with

11–12 setae.

Legs. Fore tibia with 35–39 μm long spur; mid tibia with 16–24 μm and 16–20

μm long spurs; hind tibia with 47–55 μm and 16–19 μm long spurs. Hind tibial comb consists of 11–13 setae. Pseudospurs absent, pulvilli reduced, empodium present. Length (in μm) and proportions of legs as in Tables 1, 2.

Hypopygium ( Figs 1–6 ). Tergite IX with 14–25 setae, laterosternite IX with 4–8

setae. Anal point 51–63 µm long, wide at apex, rounded, without microtrichia.

Virga 24–27 μm long consisting of 2–3 spines. Transverse sternapodeme 86–90 μm

long, from straight to convex, phallapodeme 102–114 μm long. Gonocoxite 204–

251 μm long. Superior volsella absent. Inferior volsella massive, complex shape.

Gonostylus 98–106 μm long, with large median lobe; megaseta 16 μm long, well-

developed. HR 2.08–2.37.

Female, pupa and larva. Unknown.

DISTRIBUTION. The new species is known from its type-locality at the PayKhoy Range, Yugorsky Peninsula, Russia.

Abbreviations. P 1 - P 3 – anterior, mid and hind legs; LR – length ta 1 / length ti 1; SV –

length fe+ti / length ta 1; BV – length fe+ti+ta 1 / length ta 2 +ta 3 +ta 4 +ta 5; BR – length of setae on ta 1 / minimal wide of ta 1.

ECOLOGY. All adult collections are confined to the neighborhood of lotic waters and carried out in the second half of July ( Fig. 7 ). Together with the new species in the studied water bodies Trichotanypus christmasus Makarchenko, 1983

(Podonominae), Diamesa cinerella Meigen, 1835 (Diamesinae) , Constempellina brevicosta (Edwards, 1937) (Chironominae) , and 22 species of Orthocladiinae were collected, among which the most interesting are Hydrobaenus laticaudus Saether,

1976, H. pilipodex Saether, 1976 , Krenosmittia halvorseni (Cranston et Saether,

1986), Parasmittia carinata Strenzke, 1950 , and Rheocricotopus (Rheocricotopus)

gavriloae Krasheninnikov, 2015.

ETYMOLOGY. The species is named in honor of the Russian biologist Alexey

A. Byalynitsky-Birulya (1864–1937), who participated in the Russian polar expedition in 1900–1902 led by Eduard von Toll to study the New Siberian Islands and search for the legendary Sannikov Land.

REFERENCES

Ashe, P. & O’Connor, J.P. 2012. A World Catalogue of Chironomidae (Diptera) Part 2.

Orthocladiinae . Irish Biogeographical Society and National Museum of Ireland, Dublin.

968 pp.

Krasheninnikov, A.B. 2011. Mounting technique of entomological preparations in sandarac medium. Euroasian Entomological Journal, 10(3): 278–279.

Krasheninnikov, A.B. 2014. Preliminary data on the chironomid fauna ( Diptera , Chironomidae ) of the Pay-Khoy ridge. Vladimir Ya. Levanidov's Biennial Memorial Meetings, 6:

340–347.

Krasheninnikov, A.B., Orel, O.V. & Loskutova, O.A. 2015. New data on chironomid fauna

( Diptera , Chironomidae ) of the Pay-Khoy ridge and the Polar Urals, Russia. Euroasian

Entomological Journal, 14(5): 416–428.

Makarchenko, E.A. & Makarchenko, M.A. 2014. On taxonomy of Hydrobaenus Fries, 1830

( Diptera : Chironomidae : Orthocladiinae ) from the Russian Far East, with a key to species.

Zootaxa, 3760(3): 429–438. DOI: 10.11646/zootaxa.3760.3.9

Makarchenko, E.A. & Makarchenko, M.A. 2018a. The chironomids of Chaetocladius Kieffer and Hydrobaenus Fries ( Diptera , Chironomidae ) from collection of N.I. Zelentsov.

Euroasian Entomological Journal. 17(3): 171–178. DOI: 10.15298/euroasentj.17.3.04

Makarchenko, E.A. & Makarchenko, M.A. 2018b. Three species of Hydrobaenus Fries

( Diptera : Chironomidae : Orthocladiinae ) from Belarus. Zootaxa, 4394(2): 279–287. DOI:

10.11646/zootaxa.4394.2.10

Makarchenko, E.A., Makarchenko, M.A. & Semenchenko, A.A. 2015. Morphological description and DNA barcoding of Hydrobaenus majus sp. nov. ( Diptera : Chironomidae : Orthocladiinae ) from the Russian Far East. Zootaxa, 4000(2): 287–293. DOI: 10.11646/zootaxa.4000.2.7

Makarchenko, E.A., Makarchenko, M.A., Semenchenko, A.A. & Veliaev, O.A. 2017. Morphological description and DNA barcoding of Hydrobaenus golovinensis sp.nov. ( Diptera :

Chironomidae : Orthocladiinae ) from the Russian Far East. Zootaxa, 4286(2): 277–284.

DOI: 10.11646/zootaxa.4286.2.10

Moubayed-Breil, J. & Baranov, V. 2018. Taxonomic notes on the genus Hydrobaenus with description of H. simferopolus sp. nov. from Crimea ( Diptera : Chironomidae ). Acta

Entomologica Musei Nationalis Pragae 58(2): 347–355.

Saether, O.A. 1980. Glossary of chironomid morphology terminology ( Diptera : Chironomidae ).

Entomologica Scandinavica Supplement, 16: 1–51.

Figures

Figs 1–6. Male adult of Hydrobaenus birulyai sp. n. 1 – hypopygium, holotype, dorsal

Fig. 7. Gathering place of Hydrobaenus birulyai sp. n., left – Pay-Khoy Range, nameless stream, a tributary of the Peschanaya River near its estuary; right – Pay-Khoy Range, Amderma River.