Key to the Subtribe Zavreliina

Ian R. Walker

Recommended Citation:
Walker, I. R. 2007. Key to the subtribe Zavreliina. In: I. R. Walker (Ed.), The WWW Field Guide to Fossil Midges. (http://www.paleolab.ca/wwwguide/zavreliina/zavkey.htm)

Last Update:

©2007 Ian R. Walker. ALL RIGHTS RESERVED

1. • a) Antennal pedestal with a palmate process, consisting of many pointed projections (Fig. 1)
     .............................................................................Stempellina
     
     
   • b) Antennal pedestal with a single apical projection (Fig. 2, 3)
     .............................................................................2.
   
   
   
   
2. • a) Apical projection smoothly rounded at tip, appearing somewhat delicate, without any indication of folds or creases along its length (Fig. 2)
     .............................................................................Stempellinella/Zavrelia
     
     
   • b) Apical projection angular or pointed at tip, appearing very robust, often with distinct longitudinal folds or creases along its length (Fig. 3)
     .............................................................................Thienemanniola
   
   
   

Fig. 1. Stempellina (Tribe Tanytarsina: Subtribe Zavreliina).

Fig. 2. Stempellinella/Zavrelia (Tribe Tanytarsina: Subtribe Zavreliina). NOTE: These two genera, Stempellinella and Zavrelia, cannot be reliably distinguished without the premandibles. The premandibles of Stempellinella have 3 distinct apical teeth, whereas those of Zavrelia have 4 apical teeth.

A) Mentum

B) Antennal pedestal

Fig. 3. Thienemanniola (Tribe Tanytarsina: Subtribe Zavreliina).

A) Mentum

B) Antennal pedestal