Species c . C. decorus group

Adult male:    The adult male is a typical member of the C. decorus-group.

Male terminalia of C. species c.
A typical C. decorus-type hypopygium.

Pupa: The pupa is typical of most of the species in the C. decorus-group, in lacking the secondary tubercle on the cephalic tubercles found in C. decorus itself. The pupal spur has about 4 spines.

Larva of the melanotus-type with moderately long tubules, on average of equal length (anterior 0.7 - 1.84 mm; posterior 0.6 - 1.84).    Larval length, females 9.0 - 14.0; males 9.5 - 12.3 mm).    Lateral tubules relatively short, 30 - 240 micron).    Gular region darkened, frontoclypeus pale.    Mentum (Fig. c) with pointed teeth, c2 teeth partly separated from the c1 tooth (type I - II); 4th laterals reduced to level of 5th laterals (type II).    Ventromentum (Fig. d) with about 31 - 34 striae.    Pectin epipharyngis (Fig. a) with about 11 - 15 teeth.    Mandible (Fig. e) with the third inner tooth pale and not separated (type I) and about 14 - 17 striae near base.    Antenna (Fig. b) almost two thirds ventral head length; basal segment about 3.2 - 3.6 times as long as wide; A4/A3 about 1.6 - 2.5.    Anal tubules with median constriction.

Cytology:    4 pairs of chromosomes with thummi arm combination AB, CD, EF, G, these arm combinations difficult to identify.
Arm G normally paired with subterminal nucleolus, Balbiani ring present but often difficult to see.    No other nucleoli? Quite polymorphic.

Click here to see the polytene chromosomes.

Found: Ontario - Dunrobin; Ottawa; Rideau River, Black Rapids (all Carleton Co.); Vittoria, Norfolk Co.
            Vermont - White River, Sharon, Windsor Co.

            Farm pools and pools in rivers.

See also    C. 'bifurcatus',    C. sp. b,    C. sp. j,    C. sp. 2a,    C. sp. 2b,    C. sp. 2t,    C. decorus Joh.,    C. sp. 3h,    C. sp. 3i,    C. sp. 3j,    C. sp. 3r,    C. harpi,    C. 'blaylocki',    C. decorus R & F.,    C. mozleyi,    C. winneli.

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