Larva: A small to medium size bathophilus-type. Gula very dark 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 little more than notches on side of c1 tooth (type I). Ventromental plates (Fig. d) with about 40-42 striae. Pecten epipharyngis (Fig. a) with about 23 relatively even teeth.&bbsp; Mandible (Fig. e) of type I, i.e. 3rd inner tooth with little colour and almost completely fused. Antenna (Fig. b) with basal segment relatively squat, about 2.8 times as long as wide; A2/A1 about 0.2; A4/A3 about 1.5. Mandible (Fig. e) with fourth inner tooth only partially developed (type I - II).
Cytology: Four pairs of 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.
Arm A1:
Arm B1: No obvious large puff. Bands 24-27 slightly removed from usual position close to centromere.
Arm C1:
Arm D1: Nucleolus distal of middle of the arm.
Arm E1:
Arm F1:
Click here for the polytene chromosomes
Found: Massachusetts - East Harbor (Truro), Cape Cod National Seashore, Barnstable Co.
Marine, organic sediments.
Found together with C. sp. 2n