Chaetocladius perennis Meigen

• Main Author: Saether, Ole A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2004
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Chironomidae; Chaetocladius; Chaetocladius perennis; Arctic; New Siberian Islands
• Online Access: https://doi.org/10.5281/zenodo.6271200; http://treatment.plazi.org/id/125B084CFFCEFFF4926124D8D852F646

Chaetocladius perennis (Meigen) (Fig. 21) Chironomus perennis Meigen, 1830: 249. Camptocladius incertus Lundström, 1915: 15, syn. n. Type material examined . RUSSIA: New Siberian Islands, west coast, lectotype ɗ, here designated, 12 vi 1903, M. I. Brussnew; paralectotype ɗ, south coast at Holzgebirge”, 9 vii 1903, M. I. Brussnew. MALE IMAGO (n = 1–2) Total length 3.47–3.87 mm. Wing length 1.89–2.07 mm. Total length/wing length 1.84–1.87. Wing length/length of profemur 2.38–2.41. Thorax and abdomen brown, legs dark brown. Head. AR 1.12–1.15. Ultimate flagellomere 435–444 m long. Temporal setae 15–17, consisting of 6–7 inner verticals, 6–7 outer verticals and 3 postorbitals. Clypeus with 7–8 setae. Tentorium 173–176 m long, 38–45 m wide; stipes 158–165 m long, 71–75 m wide, with well sclerotised median plate. Palpomere lengths (in m): 45–49, 60–68, 128– 154, 120–143, 180–203. Third palpomere apparently with 3 very weak sensilla clavata. Thorax. Antepronotum with 8–10 lateral setae. Acrostichals 18–21, dorsocentrals 18– 19, prealars 6, supraalars 1–2. Scutellum with 10–12 setae. Wing. VR 1.04. Costal extension 68 m long. Brachiolum with 1 seta, R with 13–15 setae, R1 with 6–7 setae, other veins bare. Squama with 10–11 setae. Legs. Spur of front tibia 68–75 m long, spurs of mid tibia 38 and 34 m long, spurs of hind tibia 75–86 and 30 m long, lateral denticles well developed. Pseudospurs 2 on ta1 and ta2 of mid leg and ta1 of hind leg, about 30 m long; ta2 of hind leg lost. Sensilla chaetica about 3–5 in apical half of ta1 of mid leg, about 6 in apical half of ta1 of hind leg, spinelike. Width at apex of front to hind tibiae (in m) as: 49–56, 53–54, 68–71. Comb of 15 setae, shortest seta 34–38 m long, longest seta 41–60 m long. Lengths (in m) and proportions of legs: Hypopygium (Fig. 21). Tergite IX including anal point with 16–20 setae, laterosternite IX with 8–10 setae. Anal point 75–98 m long, bare of microtrichia in distal two thirds. Phallapodeme 113–131 m long, transverse sternapodeme 101–105 m long. Virga ...