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

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.

Arne Fjellberg, Mageroveien 168, N-3145 Tjome, Norway
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). Ocelli 2 + 2 (fig.1a)......................................... 2
      Ocelli 5 + 5 (fig.1b)......................................... 3
 

Fig.1.
 
2(1). Dens with only one seta; furca reduced; mucro short...... wapiti
      Dens with two setae (fig.2); furca not reduced (fig.2); mucro
        long, curved and blunt (fig.2)......................... psammo
 

Fig.2.
 
3(1). Body colour pale blue.................................. mohuitli
      Body colour violet-gray over white background................. 4
 
4(3). Dens longer than mucro; sixth abdominal segment with clavate
        setae (fig.3b)........................................ armatus
      Dens subequal in length to mucro; sixth abdominal segment with
        acuminate setae (fig.3a).................................... 5
 

Fig.3.
 
5(4). First to third abdominal segment seta a3 absent; first
        tibiotarsus with 11 setae; third thoracic segment without
        microsensillum...................................... palaciosi
      First to third abdominal segment seta a3 present; first
        tibiotarsus with 12 setae; third thoracic segment with
        microsensillum.................................. unguidentatus


Differential diagnoses

armatus
Body colour violet-gray over white background. Dens longer than mucro. Ocelli 5 + 5 (fig.1b). Sixth abdominal segment with clavate setae (fig.3b).

mohuitli
Body colour pale blue. Ocelli 5 + 5 (fig.1b).

palaciosi
Body colour violet-gray over white background. Dens subequal in length to mucro. First tibiotarsus with 11 setae. First to third abdominal segment seta a3 absent. Ocelli 5 + 5 (fig.1b). Sixth abdominal segment with acuminate setae (fig.3a). Third thoracic segment without microsensillum.

psammo
Dens with two setae (fig.2). Furca not reduced (fig.2). Mucro long, curved and blunt (fig.2). Ocelli 2 + 2 (fig.1a).

unguidentatus
Body colour violet-gray over white background. Dens subequal in length to mucro. First tibiotarsus with 12 setae. First to third abdominal segment seta a3 present. Ocelli 5 + 5 (fig.1b). Sixth abdominal segment with acuminate setae (fig.3a). Third thoracic segment with microsensillum.

wapiti
Dens with only one seta. Furca reduced. Mucro short. Ocelli 2 + 2 (fig.1a).


References