Chironomus (Chironomus) crassicaudatus Malloch

Saether, Ole A., 2012, The Chironomus group (Diptera: Chironomidae) in Lake Winnipeg, Canada, Zootaxa 3275, pp. 1-19 : 8

Chironomus (Chironomus) crassicaudatus Malloch

Chironomus crassicaudatus Malloch, 1915: 453 .

Material examined. Lake Winnipeg light traps: Victoria Beach, 2 males, 9.vi. 1969; Gull Harbour, 9 males, 16.vi. 1969; Victoria Beach, 1 male, 25.vi. 1969; Matheson Island Government Wharf, 22 males, 26.vi. 1969; McBeth Harbour, 1 male, 30.vi. 1969; Pine Dock, 2 males, 31.vi. 1969; Beaver Point, 67 males, 18.vi. –7.vii. 1971; Old Fishing Dock, 18 males, 16.vi. –11.viii. 1971; Calder's Dock, 35 males, 11.vi. –2.ix. 1971; Hecla Island, 47 males, 27.vii. –25.viii. 1971.

Normal non-parasitized males from Lake Winnipeg have an AR of 3.90–4.64, 4.21 (21); 31–64, 44 (10) sensilla chaetica in apical 1/3 of ta1 of p2; and 34–54, 43(10) sensilla chaetica in apical 1/3 of ta l of p2. Male intersexes with completely female antenna and female sternite VIII have 157–190, 171(5) sensilla chaetica on p2;170–210, 198 (5) sensilla chaetica on p3, indicating that these are the numbers found in females. The hypopygia of a normal male and that of a male intersex are illustrated in Saether & Galloway (1980 fig. 8C, D).

Distribution and ecology. The species was previously known from natural lakes, impoundments, deep pools of large rivers and deeper farm ponds. It is most common in the southeastern and central United States, extending west to the central plains. All known localities are east of the Rocky Mountains ( Wülker et al. 1971: 21, Oliver et al. 1990: 42, Martin 2012).