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

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). Lateral teeth on claw absent.................................. 2
      Lateral teeth on claw present................................. 3
 
2(1). Eyes 3 + 3........................................ galapagoensis
      Eyes 6 + 6............................................... kingae
 
3(1). Colour blue-violet............................... mariagalanteae
      Colour grey................................................... 4
 
4(3). Distal setae of ventral tube 4 + 4; apex of fourth antennal
        segment with minute subapical organ (fig.1); maxillary palp
        with 4 sublobal setae (fig.2); posterior setae of ventral tube
        2 + 2............................................... restingae
      Distal setae of ventral tube 5 + 5; apex of fourth antennal
        segment with rodlike subapical organ and pin-setae; maxillary
        palp with 3 sublobal setae; posterior setae of ventral tube 1
        + 1.................................................... dispar

Fig.1.
 

Fig.2.
 


Differential diagnoses

dispar
Apex of fourth antennal segment with rodlike subapical organ and pin-setae. Colour grey. Distal setae of ventral tube 5 + 5. Lateral teeth on claw present. Maxillary palp with 3 sublobal setae. Posterior setae of ventral tube 1 + 1.

galapagoensis
Eyes 3 + 3. Lateral teeth on claw absent.

kingae
Eyes 6 + 6. Lateral teeth on claw absent.

mariagalanteae
Colour blue-violet. Lateral teeth on claw present.

restingae
Apex of fourth antennal segment with minute subapical organ (fig.1). Colour grey. Distal setae of ventral tube 4 + 4. Lateral teeth on claw present. Maxillary palp with 4 sublobal setae (fig.2). Posterior setae of ventral tube 2 + 2.


References