Oesophageal opening (at left), Pecten epipharyngis and Premandible.
Photo courtesy Isabelle proulx.
Larval mouthparts of Chironomus decorus-gp. species 2
a. Mentum - Note 4th laterals slightly reduced (type I-II); high c1 and distinct c2 teeth (type III or II) b. Antenna;
c. Ventromentum; d. Pecten epipharyngis; e. Mandible - note 3rd inner tooth only partially separated and pale (type II).