http://www.collembola.org/key/isotomid.htm - Last updated on 2016.08.21 by Frans Janssens
Checklist of the Collembola: Key to the subfamilies of Isotomidae

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.

Mikhail Potapov, Moscow State Pedagogical University, Moscow 129164, Russia
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

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). Anal spines absent............................................ 2
      Anal spines present........................................... 8
 
2(1). Furca absent...................................... Anurophorinae
      Furca present................................................. 3
 
3(2). Furca reduced..................................... Anurophorinae 3
      Furca well developed.......................................... 4
 
4(3). Intugement granulated............................. Pachyotominae
      Intugement smooth............................................. 5
 
5(4). Anterior manubrial setae few.................................. 6
      Anterior manubrial setae many........................ Isotominae
 
6(5). Body sensilla few................................. Anurophorinae 4
      Body sensilla many............................................ 7
 
7(6). Fourth to sixth abdominal segment fused........... Anurophorinae 5
      Fourth to sixth abdominal segment not fused....... Proisotominae
 
8(1). Anterior manubrial setae few...................... Anurophorinae 1
      Anterior manubrial setae many........................ Isotominae 2

Endnotes

1 Anurophorinae with 2-8 anal spines.

2 Only in ecomorphic or epitokous species of Isotominae.

3 Anurophorinae with reduced furca, such as in Isotomodella.

4 Anurophorinae with well developed furca, such as in Cryptopygus.

5 Anurophorinae with fused posterior abdominal segments, such as in Folsomia.


Differential diagnoses

Anurophorinae
Anal spines absent. Furca absent.

Anurophorinae 1
Anal spines present. Anterior manubrial setae few.

Anurophorinae 3
Anal spines absent. Furca present. Furca reduced.

Anurophorinae 4
Anal spines absent. Anterior manubrial setae few. Body sensilla few. Furca present. Furca well developed. Intugement smooth.

Anurophorinae 5
Anal spines absent. Anterior manubrial setae few. Body sensilla many. Fourth to sixth abdominal segment fused. Furca present. Furca well developed. Intugement smooth.

Isotominae
Anal spines absent. Anterior manubrial setae many. Furca present. Furca well developed. Intugement smooth.

Isotominae 2
Anal spines present. Anterior manubrial setae many.

Pachyotominae
Anal spines absent. Furca present. Furca well developed. Intugement granulated.

Proisotominae
Anal spines absent. Anterior manubrial setae few. Body sensilla many. Fourth to sixth abdominal segment not fused. Furca present. Furca well developed. Intugement smooth.


References