Male terminalia of C. sp. e.
Adult with terminalia similar to that of C. riparius.
Male terminalia of C. sp. e.
Larva a medium sized (length, female abt 14.6 - 16.5 mm) thummi-type with ventral tubules of equal length (ant. 1.35 - 2.75 mm; post. 1.85 - 2.73 mm). Gular region pale to slightly dark, frontoclypeus pale or slightly darkened. Mentum (Fig. c) with pointed teeth; 4th laterals hardly reduced (type I); c1 tooth long and narrow with c2 teeth well separated (type III). Ventromentum (Fig. d) with about 37 - 43 not very obvious striae. Pecten epipharyngis (Fig. a) with about 13 - 17 somewhat irregular, sharp teeth. Antenna (Fig. b) with relatively long, narrow basal segment, about 4 (3.9 - 4.3) times as long as wide; ring organ between a third and half way from base of A1; AR about 2.2 - 2.4; ratio of segments (in microns) about 185 ; 40 : 11 : 14 : 8. Mandible (Fig. d) with 3rd inner tooth only slightly darkened and hardly separated (type II), and with about 11 - 14 striae on the inner margin.
Cytology
: 4 pairs of chromosomes with pseudothummi arm combination AE, BF, CD, G.
Arm G generally paired unless heterozygous, with a subterminal nucleolus and 2 Balbiani
rings which vary in position depending on the sequence. No nucleoli in other arms. Polymorphic at least in arms A, C, and G.
Arm A1: 1 - 2c, 10 - 12, 3i - 2d, 9 - 4, 13 - 19; ie. as holomelas
Arm A2: 1 - 2c, 10 - 12, 3i - 2d, 16 - 13, 4 - 9, 17 - 19
Arm B1: Typical puff near centromere
Arm E1: 1 - 2b, 4c - 12b, 4b - 2c, 12c - 13; (preliminary)
Arm F1: 1 - 2, 16 - 19, 13 - 15, 3 - 12, 20 - 23; (preliminary)
Click here for the polytene chromosomes
Pupa with narrow cephalic tubercles and with about 2 spines on the spur.
Found: Ontario – Clarence Creek, Russell Co.; Dunrobin, Carleton Co.
Wisconsin – Arboretum, Madison, Dane Co.; Trout Lake Limnol. Stn., Vilas Co.
Temporary pools, especially snow melt pools.