The adults of this species are not known for sure, butadults reared from fluviatilis-larvae in the area are similar to those of C. decorus-group species.
Pupa: - not known.
Fourth instar larva of fluviatilis-type i.e. ventral tubules scimitar shaped with relatively pointed ends, with no lateral tubules.
Cytology: 4 polytene chromosomes with the thummi arm combination: AB, CD, EF, G.
Centromeres not heterochromatic. Arm G with subterminal nucleolus and BR near middle of the arm. No nucleoli in the other chromosomes Sometimes a puff developed in arm B and C. No polymorphism found in specimens examined.
win A1: 1a-e, 9a-e, 2d-3e, 17-16, 1f-2c, 13-14, 15e-a, 3f-i, 12-10, 4-7, 8g-a, 17e-19
win B1: Puff with dark bands (groups 7-8) near middle of the arm, with typical groups 24-28 just proximal to them.
win C1: typical group 2d-5b near middle of the arm, a puff developed near the contromere
win D1: approx. 1-3, 11-12, 15-13d, 4(?)-8,13c-a(?), 16(?), 9-10, 17-24 i.e. as mozleyi D1
win E1: 1-2b, 11b-10c, 3f-4, 10b-5, 3e-2c, 11c-13
win F1: 1a-1, 9-5d, 14-17, 10a-d, 13b-11, 13cd, 18-19b, 2-5c, 19c-23
From depths of 6-12 m in fine sand sediments.Larva is most easily distinguished from the co-habiting C. mozleyi by the narrower head capsule, the mentum type, and the lower number of striae on the ventromentum.
This species is a member of the C. decorus-group. Sequences for arms A, E and F given in Wülker, Devai and Devai (1989) as C. sp. Michigan B. Description of the species by Wülker (2007). Holotype in Zoologische Staats Sammlung, Munich.