Orthocladius (Euorthocladius) rivicola Kieffer

Saether, Ole A., 2005, A new subgenus and new species of Orthocladius van der Wulp, with a phylogenetic evaluation of the validity of the subgenera of the genus (Diptera: Chironomidae), Zootaxa 974, pp. 1-56 : 49-50

Orthocladius (Euorthocladius) rivicola Kieffer

( Figs. 61–65 , 69 )

Orthocladius rivicola Kieffer, 1911: 181 .

Orthocladius fusiformis Goetghebuer , in Goetghebuer & Dorier 1939: 30. Euorthocladius rivicola Kieffer ; Thienemann 1936: 191.

Orthocladius (Euorthocladius) rivicola Kieffer ; Brundin 1956: 101, Soponis 1990: 26, pro parte.

Material: examined: NORWAY: Hordaland, Vaksdal, Ekse, 4 ɗ reared from larva, 2 Ψ reared from larva, 3 ɗ reared from pupa, 10 mature ɗ pupa, mature Ψ pupa, 21 vi, 11 vii, & 9 vii 1970, E. Willassen; same locality, 3 ɗ 1976, 8–15 vii & 5–10 viii 1976, T. Andersen; same locality, 8 pupal exuviae, 9 vi 1987, Ø. A. Schnell; same locality, ɗ reared from larva, 5 pupal exuviae, 7 vi 1988, Ø. A. Schnell; Hordaland, Vaksdal, Storelva, 6 pupal exuviae, 9 vi 1986, Ø. A. Schnell; Buskerud, Hol, Ustaoset, Smettbakgrovi stream below waterfall, 1 pupal exuviae, 27 vii 1993, P. H. Langton & O. A. Saether (all ZMBN). CAN­ ADA: Alberta, Waterton National Park, Rows Creek above highway, ɗ reared from pupa, 21 vii 1967, A. L. Hamilton & O. A. Saether ( ZMBN). USA: Arizona, Summerhaven on Mt. Lemmon near Tucson, Sabino Creek, ɗ reared from pupa, ii 1986, Doughman ( ZMBN).

The male imago, pupa, and larva were described by Soponis (1990). The female, however, remained undescribed.

Female imago (n =1–2)

Total length 2.36 mm. Wing length 1.81 mm. Total length/wing length 1.31. Wing length/length of profemur 3.20.

Head. AR 0.62–0.65. Flagellomere lengths (in µm): 53–68, 34–38, 34–48, 34–41, 86– 110. Coronal suture 30–38 µm long. Temporal setae 11–13, consisting of 3–5 inner, 7 outer verticals, and 1 postorbital. Clypeus with 8–11 setae . Tentorium 135 µm long, 26 µm wide. Stipes 135 µm long, 26 µm wide. Palpomere lengths (in µm): 30–38, 41–60, 68–98, 60–79, 83–116.

Thorax. Antepronotum with 4–6 setae . Dorsocentrals 7, acrostichals about 2, prealars 3–5, no supraalar. Scutellum with 11–13 setae .

Wing. Brachiolum with 1 seta; R with 8–13 setae , R1 with 4–8, R4+5 with 6–10 setae . Squama with 14 to about 24 setae .

Legs. Spur of front tibia 49 µm long, spurs of middle tibia 26 and 21 µm long, of hind tibia 56 and 23 µm long. Width at apex of front tibia 39 µm, of and middle tibia 41 µm, of hind tibia 45 µm. Pseudospurs present on ta1 and ta2 of mid leg and hind leg, 23–27 µm long. Sensilla chaetica 9 at 0.07–0.32 on ta1 of mid leg, 2 at 0.07–0.15 on ta1 of hind leg. Lengths (in µm) and proportions of legs:

Abdomen. Tergites VIII with 12–20 setae , sternite VIII with 15–29 setae .

Genitalia ( Figs. 61–65 ). Tergite IX strongly divided with margins clearly delimited, with 16 setae . Gonocoxite with 7–8 long and 3–5 short setae . Cercus 105–120 µm long. Seminal capsule ovoid with 15 µm long, tapered, sclerotised neck; 64–75 µm long; anterior 51–64 µm darker sclerotised; 54–60 µm wide. Spermathecal ducts meandering with separate openings. Notum 120–135 µm long.

Figures

FIGURES 51 – 65. Orthocladius (Euorthocladius) spp., female imagines, genitalia, 51 – 55: O. (E.) annellae sp. n., 51: ventral view, 52: dorsomesal lobe, 53: apodeme lobe, 54: ventrolateral lobe, 55: dorsal view, 56 – 60: O. (E.) ashei Soponis, 56: ventral view, 57: dorsomesal lobe, 58: apodeme lobe, 59: ventrolateral lobe, 60: dorsal view, 61 – 65: O. (E.) rivicola Kieffer, 61: ventral view, 62: dorsomesal lobe, 63: apodeme lobe, 64: ventrolateral lobe, 65: dorsal view.

FIGURES 66 – 69. Orthocladius (Euorthocladius) spp., pupae, 66, 67: O. (E.) annellae sp. n., 66: tergites, 67: thoracic horn, 68: O. (E.) ashei Soponis sp. n., thoracic horn, 69: O. (E.) rivicola Kieffer, thoracic horn.