Paralimnophyes trilineatus (Lundström) Lundstrom, 2004

Saether, Ole A., 2004, The chironomids (Diptera, Chironomidae) described by Lundström (1915) from arctic Siberia, with a redescription of Derotanypus sibiricus (Kruglova & Chernovskii), Zootaxa 595, pp. 1-35 : 18-19

Paralimnophyes trilineatus (Lundström) , comb. n.

( Figs. 19, 20 )

Camptocladius trilineatus Lundström, 1915: 15 .

Paralimnophyes arcticus Brundin, 1956: 130 , syn. n.

Type material examined. RUSSIA: New Siberian Islands, south coast, "Holzgebirge”, lectotype ɗ, here designated, 22 vi 1903, M. I. Brussnew; paralectotypes 2 ɗ, 1 Ψ, 3 & 16 vi 1903, M. I. Brussnew.

MALE IMAGO (n = 1–3)

Total length 3.10–3.55 mm. Wing length 1.65–1.80 mm. Total length/wing length 1.83–1.98. Wing length/length of profemur 2.55–2.65. Coloration totally brownish black.

Head. AR 0.86. Ultimate flagellomere 459 m long. Temporal setae 8, including 1–2 inner verticals, 4–5 outer verticals, and 1–3 postorbitals. Clypeus with 18–23 setae. Tentorium 169 m long, 30–38 m wide. Stipes 150–169 m long, 41 m wide. Palpomere lengths (in m): 53, 60–71, 94–109, 86–98,124. Third palpomere with 1–2 lanceolate sensilla clavata 15–23 m long.

Thorax. Antepronotum with 2 setae. Acrostichals 7–8 (scalpellate, in centre of scutum), dorsocentrals 13–14, prealars 3–4. Scutellum with 8–10 setae.

Wing. VR 1.22–1.33. Costal extension 64 m long. Brachiolum with 1 seta, R with 13–15 setae, R1 with 1–2, R4+5 with 5 setae. Squama with 5–6 setae.

Legs. Spur of front tibia 60–68 m long, spurs of middle tibia 26–30 and 23 m long, of hind tibia 45–56 and 19–26 m long. Width at apex of front tibia 45–53 m, of middle tibia 45–60 m, of hind tibia 56– 60 m. Sensilla chaetica 8–11 on ta1 of mid leg, about 10 on ta1 of hind leg. Lengths (in m) and proportions of legs:

Hypopygium ( Fig. 19 ). Tergite IX reticulate, with 16–20 setae; laterosternite IX with 8 setae. Anal point parallel­sided, 34–41 m long, on 94 m long, 113 m wide triangular base. Phallapodeme 113–143 m long, with rounded phallapodeme lobe; transverse sternapodeme 143–169 m long, oral projections well developed. Gonocoxite 300–341 m long. Gonostylus 105–131 m long, parallel­sided, crista dorsalis long and low, megaseta 15 m long. HR 2.60–2.86, HV 2.71–2.95.

FEMALE IMAGO (n = 1)

Total length about 3.0 mm. Wing length 1.85 mm. Total length/wing length about 1.6. Wing length/length of profemur 3.27. Coloration as in male.

Head. AR 0.51. Length of flagellomeres (in m) as: 75, 60, 68, 41, 135. Temporal setae 8, consisting of 2 outer verticals; 4 inner verticals, and 2 postorbitals. Clypeus with 18 setae. Tentorium 169 m long, 23 m wide; stipes 139 m long, 30 m wide. Palpomere lengths (in m): 49, 56, 75, 83, Pm5 lost.

Thorax. Antepronotum with 2 lateral setae. Acrostichals 12 (scalpellate), dorsocentrals 18, prealars 4. Scutellum with 12 setae.

Wing. VR 1.21. Costal extension 49 m long. Brachiolum with 1 seta, R with 14, R1 with 9, R4+5 with 7 setae. Squama with 7 setae.

Legs. Spur of front tibia 41 m long, spurs of mid tibia 30 m and 23 m long, spurs of hind tibia 26 m and 24 m long. Width at apex of front to hind tibiae (in m) as: 45, 49, 56. Comb of 11 setae; shortest seta 26 m long. longest seta 41 m long. Sensilla chaetica 14 on ta1 of front leg, 13 on ta1 of mid leg, and 8 on ta1 of hind leg. Lengths (in m) and proportions of legs:

Abdomen. Tergite I with 22 setae, T II–VII each with 25–32 setae, T VIII with 22 setae. Setae on sternites I–VIII as: 0, 6, 11, 15, 19, 19, 20, 15.

Genitalia ( Fig. 20 ). Tergite IX apparently undivided, with 20 setae. Gonocoxite with 13 setae. Cercus 135 m long. Seminal capsule 98 m long, 83 m wide; with wide, long, curved neck. Spermathecal ducts with very long loops. Gonapophysis VIII divided, with large ventrolateral lobe and narrow dorsomesal lobe. Notum 150 m long.

Remarks

All details of this easily recognisable species are in accordance with those given by Brundin (1956: 130) as well as the few details given by Lundström (1915: 15).

Figures

FIGURES 15 – 21. Orthocladius, Paralimnophyes and Chaetocladius, 15 – 18: female genitalia, Orthocladius (Orthocladius) pallidicornis Lundström, 15: ventral view, 16: apodeme lobe, 17: dorsomesal lobe, 18: ventrolateral lobe, 19 – 20: Paralimnophyes trilineatus (Lundström) comb. n., 19: male hypopygium, 20: female genitalia, lateral view, 21: Chaetocladius perennis (Meigen), male hypopygium from lectotype of Camptocladius incertus Lundström.