Mouthparts of C. riparius
a. Pecten epipharyngis and premandible; b. Antenna; c. Mentum - note 4th lateral in line with 3rd and 5th laterals (type I),
and c2 teeth separate from c1 (type II); d. Ventromentum with about 43 striae; e. Mandible - note 3rd inner tooth is pale and not fully separated (type II).

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