Species 4k. C. species 'Cape Cod'.

This species is in BOLD Bins: BOLD:AAV7387 and BOLD:AAV7388

No adult is definitely associated, but slightly larger males than those of C. quinnitukqut, which occur at the same location, may belong to this species.

Adult:
The adults of this species are not known for sure, but adults reared from fluviatilis-larvae in the area are similar to those of C. decorus-group species.

Larva:  A small to medium size (fem. abt. 13.2 mm.)bathophilus-type.  No information for anal tubules.
Gula very dark on post 2/3 or almost to the base of the mentum; frontoclypeus pale, but some darkening towards rear of head and at base of antenna.
Mentum (Fig. c.) with 4th lateral only slightly reduced (type I), 6th lateral slightly lower than 4th lateral; c2 teeth often little more than notches on side of c1 tooth (type I), but sometimes relatively well separate (type II).  Ventromental plates (Fig. d) separated by about 30% of the width of the mentum, with about 39 - 43 striae; VMR about 0.25-0.27.
Pecten epipharyngis (Fig. a) with about 21 (19 - 24, 5) relatively even teeth.  Premandible usually with inner tooth longer, and about 1.7-2.3 times wider than, the outer tooth.
Antenna (Fig. b) with basal segment relatively squat, about 2.8 - 3.5 times as long as wide, RO about a quarter to a third up from the base; AR about 2.05 - 2.39; A1/A2 about 5.1-5.9; A4/A3 about 1.5-1.7; proportions of the antennal segments (micron) 133 : 24 : 6 : 12 : 6.
Mandible (Fig. e) with fourth inner tooth only partially developed and pale (type I - IIA), about 12.5 (10-16,5) striae on the inner surface at the base.

Cytology: Four polytene chromosomes with the thummi-arm combination AB, CD, EF, G.
Arm G with a sub-terminal nucleolus, next to a heterochromatic cap; BR immediately distal of nucleolus; homologs either unpaired or paired at the heterochromatic cap.  Second nucleolus about 2/3 along arm D.    No polymorphism in the specimens examined.

Arm A1:   
Arm B1:    No obvious large puff. Bands 24-27 removed from usual position close to centromere, as in B1 of C. quinnitukqut.
Arm C1:   
Arm D1:    Nucleolus distal of middle of the arm.
Arm E1:    appears rearranged compared with C. quinnitukqut
Arm F1:    appears to differ by a small median inversion from F1 of C. quinnitukqut.

Found: Massachusetts - East Harbor (Truro), Cape Cod National Seashore, Barnstable Co.

            Marine, organic sediments.
            Found together with C. quinnitukqut, to which it may be related.

Some larval characters and a photograph of the polytene chromosome complement are given in Martin et al. (2010).

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Created: 5 July 2021
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