Key to Genera in the Tribe Chironomini. Part II.

Ian R. Walker

Recommended Citation:
Walker, I. R., 1997. Key to genera in the tribe Chironomini. Part II. In: I. R. Walker (Ed.), The WWW Field Guide to Fossil Midges. (http://www.paleolab.ca/wwwguide/chironomini/concave.htm)

Last Update: 1 June 1997

©2007 Ian R. Walker. ALL RIGHTS RESERVED

1. • a) Ventromental plates vestigial; all teeth of mentum uniformly dark (Fig. 1).
     .............................................................................Stenochironomus
     
     
   • b) Ventromental plates prominent; mentum with a broad, unpigmented median tooth (Fig. 2, 3)
     .............................................................................2.
   
   
   
   
2. • a) Mentum with ?? pairs of lateral teeth (Fig. 2).
     .............................................................................Cryptochironomus
     
     
   • b) Mentum with ?? pairs of lateral teeth (Fig. 3).
     .............................................................................Demicryptochironomus
   
   
   
   

Fig. 1. Stenochironomus: Left: mentum, Right: mandible

Fig. 2. Cryptochironomus.

Fig. 3. Demicryptochironomus.