http://www.collembola.org/key/xenyllog.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Xenyllogastrura

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.

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). Furca absent.................................................. 2
      Furca present................................................. 4
 
2(1). Eyes absent............................................. reducta
      Eyes present.................................................. 3
 
3(2). Eyes 2 + 2; tibiotarsus without setae having enlarged apex......
         .................................................... steineri
      Eyes 4 + 4; tibiotarsus with setae having enlarged apex.........
         .................................................... afurcata
 
4(1). Dens with 1 seta........................................ affinis
      Dens with 2 setae............................................. 5
 
5(4). First, second and third tibiotarsus with 13, 13 and 12 setae;
        empodium reduced, almost unrecognisable.............. arenaria
      First, second and third tibiotarsus with 17, 17 and 16 setae;
        empodium not reduced........................................ 6
 
6(5). Eyes 2 + 2.............................................. pruvoti
      Eyes 4 + 4........................................... octoculata

Endnotes

1 Xenyllogastrura venezueliensis Thibaud & Diaz, 1998 is to be integrated into the key. Any help is appreciated.


Differential diagnoses

affinis
Dens with 1 seta. Furca present.

afurcata
Eyes present. Eyes 4 + 4. Furca absent. Tibiotarsus with setae having enlarged apex.

arenaria
Dens with 2 setae. Empodium reduced, almost unrecognisable. First, second and third tibiotarsus with 13, 13 and 12 setae. Furca present.

octoculata
Dens with 2 setae. Empodium not reduced. Eyes 4 + 4. First, second and third tibiotarsus with 17, 17 and 16 setae. Furca present.

pruvoti
Dens with 2 setae. Empodium not reduced. Eyes 2 + 2. First, second and third tibiotarsus with 17, 17 and 16 setae. Furca present.

reducta
Eyes absent. Furca absent.

steineri
Eyes present. Eyes 2 + 2. Furca absent. Tibiotarsus without setae having enlarged apex.


References