Species 3h. C. decorus-group sp. 3h.


Male: Wing length abt 3.3 mm.  Fore LR about 1.50.
Frontal tubercles large.
Abdominal coloration as in C. maturus, but paler.
Superior volsella very slightly darker than the rest of the terminalia.  Anal point broad.

Pupa:  Not known.

Larva a medium sized (13.7 - 16.3 mm) plumosus-type; lateral tubules about 240 - 360 µm.  Ventral tubules moderately long and about equal length (ant. 1.34 - 2.56 mm; post. 1.98 - 2.44 mm).  Anal tubules about 2 - 2.5 times longer than wide, (len. 330 - 480 µm), without a constriction, ventral pair tending to be longer but narrower.Gular region dark on posterior half, frontoclypeus generally pale, but may be slightly darkened.
Mentum ( Fig. c) with somewhat rounded teeth; c1 tooth relatively narrow, top sometimes rounded; c2 teeth moderately separated (probably type III if not worn); 4th laterals generally not reduced (type I-II).
Ventromental plates ( Fig. d & c) separated by about a third of mentum width, about 43 - 46 striae reaching about half way to anterior margin; VMR about 0.33.Pecten epipharyngis ( Fig. a) with about 12 - 15 relatively broad teeth (type C).  Premandible with inner tooth slightly longer and about 2.5 times the width of the outer tooth.
Antenna ( Fig. b) with Ring organ between a third and half way up A1; AR about 2.0 - 2.4; A1 about 3.4-4.3 times longer than wide, relative length of segments (µm) 152 : 34 : 10 : 14 : 7.
Mandible ( Fig. e) with third inner tooth moderately separated but pale (type IIB); pecten mandibularis with about 10 - 14 bristles; about 14 - 17 furrows on outer surface at the base.

Cytology:  4 polytene chromosomes with the thummi arm combination AB, CD, EF, G.
Arm G relatively short and thick with a sub-terminal nucleolus, probably in terminal heterochromatic cap, and a BR near the center, followed by a definite constriction and dark bands; commonly only paired at the nucleolus.  Arm B may have a nucleolus just near the center of the arm, also with a bulb (group 7?) near the end of the arm with some dark bands proximal.

Found: New Brunswick - Kouchibouguac National Park (48.8583°N; 64.9750°W).
            Ontario - ¿South March nr. Mud Lake (44.88°N, 78.27°W), Carleton Co.

            Pools and rivers.

Appears to show relationship to C. sp. u.

See also  C. bifurcatus,  C. sp. b,  C. sp. c,  C. sp. j,  C. sp. 2a,  C. sp. 2b,  C. "butleri",  C. decorus Joh.,  C. sp. 3i,  C. sp. 3j,  C. harpi,  C. blaylocki,  C. mozleyi,   C. winneli.

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Modified: 9 September 2018
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