http://www.collembola.org/key/orchidae.htm - Last updated on 2017.04.30 by Frans Janssens
Checklist of the Collembola: Key to the genera of unscaled Orchesellidae

This key is still under construction. Note that missing figures will be provided as soon as possible. Currently, the key is in the feasibility study phase to find out how to integrate in the checklist in a modular way a key that has been generated with DELTA.

Rationale

The rationale for taxa used and not used as well as subtaxonomic classification for some taxa is to be provided.

Key

Note that no distinction between subtaxa and taxa is made in the key.

    
1(0). Postantennal organ absent..................................... 2
      Postantennal organ rudimentary (fig.1)........................ 6

Fig.1.
   
2(1). Head with 2 + 2 or fewer eyes................................. 3
      Head with 7 + 7 or more eyes.................................. 4
 

3(2). Mucro with strong anteapical tooth (fig.2b)........ Neorchesella
      Mucro with very weak anteapical tooth (fig.2a)...... Bessoniella

Fig.2.
   
4(2). Second antennal segment not subsegmented (fig.3b&c)........... 5
      Second antennal segment subsegmented (fig.3a)........ Orchesella

Fig.3.
   
5(4). First antennal segment not subdivided (fig.3c)...... Corynothrix
      First antennal segment subdivided (fig.3b)........ Orchesellides
 

6(1). Mucro bidentate (fig.4b)........................ Australotomurus
      Mucro falcate (fig.4a)................................ Nothobrya

Fig.4.
  

Differential diagnoses

Australotomurus
Mucro bidentate (fig.4b). Postantennal organ rudimentary (fig.1).

Bessoniella
Head with 2 + 2 or fewer eyes. Mucro with very weak anteapical tooth (fig.2a). Postantennal organ absent.

Corynothrix
First antennal segment not subdivided (fig.3c). Head with 7 + 7 or more eyes. Postantennal organ absent. Second antennal segment not subsegmented (fig.3b&c).

Neorchesella
Head with 2 + 2 or fewer eyes. Mucro with strong anteapical tooth (fig.2b). Postantennal organ absent.

Nothobrya
Mucro falcate (fig.4a). Postantennal organ rudimentary (fig.1).

Orchesella
Head with 7 + 7 or more eyes. Postantennal organ absent. Second antennal segment subsegmented (fig.3a).

Orchesellides
First antennal segment subdivided (fig.3b). Head with 7 + 7 or more eyes. Postantennal organ absent. Second antennal segment not subsegmented (fig.3b&c).

References