Cryptochironomus ramus Mason

• Main Author: Saether, Ole A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Chironomidae; Cryptochironomus; Cryptochironomus ramus; Canada; Long Point; Beaver Creek
• Online Access: https://zenodo.org/record/6220732; https://doi.org/10.5281/zenodo.6220732

Cryptochironomus ramus Mason (Fig. 4 A, 5) Cryptochironomus sp. n. B Chang et al. 1993. Cryptochironomus sp. n. A Chang et al. 1994. Material examined. CANADA: Manitoba, Lake Winnipeg records: Victoria Beach, 53 males, 9. & 25.vii. 1969; Pine Dock, 38 males, 10.vii.– 2.ix. 1969; 0.5 km off George Island, 3 males, 11.vii. 1969; 3 km off Grand Rapids, 1 male, 13.vii. 1969; 10 km off (Sturgeonskin) Long Point, 67 males, 14.vii. 1969; 3 km off McCreary Island, 462 males, 15.vii. 1969; Gull Harbour, 16 males, 16.vii. 1969; 3 km off George Island, 11 males, 27.vii. 1969; Grand Rapids Government Wharf, 34 males, 28.vii. 1969; 5 km of Selkirk (Horse) Island, 6 males, 29.vii. 1969; McBeth Harbour, 7 males, 7.ix. 1969; Beaver Point, 9 males, 30.vi.– 19.viii. 1971; 20 Mile Creek, 5 males, 22.vii.– 1.ix. 1971; Old Fishing Dock, 226 males, 29.vi.– 18.viii. 1971; Calder’s Dock, 33 males, 28.vii.– 31.viii. 1971; Hecla Island, 21 males, 27.vii.– 25.viii. 1971; Beaver Creek, 5 males, 1 pupal exuviae, 15.vi.– 29.vii 1971; 16 km east Long Point, 3 males, 10.vi. & 15.vii. 1969; South Basin, 43 larvae, 4.vi.– 31.x. 1969; Narrows, 36 larvae, 4. vi.– 31.x. 1969; North Basin, 152 larvae, 1 pupa, 4.vi.– 31.x. 1969. The male imagines of C. ramus from Lake Winnipeg are characterized by a wing length of 3.01–3.50 mm, an AR of 2.93–3.40, LR 1 of 1.40–1.55, absence of frontal tubercles, and hypopygium of C. fulvus type. The pupa has extremely long cephalic tubercles (about 1.37 mm) with a very long (about 0.97 mm) main branch, is about 7.0 mm long, and has about 65 filaments in fringe of anal lobe. The presumed fourth instar larvae have head capsule length of 0.52–0.72 mm, postmentum length of 220–248 µm, ventromental plates 2.96–3.24 times as long as wide, AR of 1.4–1.7, and apical tooth of mandible 0.21–0.26 times as long as mandible. Male imago (n = 9–11, except when otherwise stated) Total length 6.08–7.35, 6.80 mm. Wing length 3.01–3.50, 3.24 mm. Total length/wing length 1.96–2.19, 2.09. Wing length/length of profemur 2.52–2.64, ...