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

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.

Pierre Nayrolles, Laboratoire de Zoologie, Ecobiologie des Arthropodes édaphiques, Université Paul Sabattier, Toulouse Cedex, F-31062, France
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). Mesotibial posterior seta on fifth whorl absent............... 2
      Mesotibial posterior seta on fifth whorl present.............. 3
 
2(1). Dental external seta on first whorl absent; anal appendage
        ribbon-like; profemoral third seta on antero-external
        generatrix present in adult...................... canigouensis
      Dental external seta on first whorl present; anal appendage
        fan-shaped; profemoral third seta on antero-external
        generatrix absent.................................... cruciata
 
3(1). Cuticle of frons with large plaques; uppermost two circumanal
        setae on lower anal flap av1' and av1 generally lacerated in
        female............................................... pruinosa
      Cuticle of frons with medium-sized plaques; uppermost two
        circumanal setae on lower anal flap av1' and av1 very finely
        serrated in female.......................................... 4
 
4(3). Body pigment mixed orangey-ochre and dark purple...... cadiensis
      Body pigment monocoloured..................................... 5
 
5(4). Body pigment blue.............................. caeruleovernalis
      Body pigment yellow............................... luteovernalis

Endnotes

1. Cassagnaudiella trichroma Nayrolles, 1995 was synonymised to Cassagnaudiella cruciata by Bretfeld (1999).

2. Appendicular chaetotactic nomenclature according to Nayrolles (1993); whorls and generatric setae are counted beginning at apex of appendage.


Differential diagnoses

cadiensis
Body pigment mixed orangey-ochre and dark purple. Cuticle of frons with medium-sized plaques. Mesotibial posterior seta on fifth whorl present. Uppermost two circumanal setae on lower anal flap av1’ and av1 very finely serrated in female.

caeruleovernalis
Body pigment monocoloured. Body pigment blue. Cuticle of frons with medium-sized plaques. Mesotibial posterior seta on fifth whorl present. Uppermost two circumanal setae on lower anal flap av1’ and av1 very finely serrated in female.

canigouensis
Anal appendage ribbon-like. Dental external seta on first whorl absent. Mesotibial posterior seta on fifth whorl absent. Profemoral third seta on antero-external generatrix present in adult.

cruciata
Anal appendage fan-shaped. Dental external seta on first whorl present. Mesotibial posterior seta on fifth whorl absent. Profemoral third seta on antero-external generatrix absent.

luteovernalis
Body pigment monocoloured. Body pigment yellow. Cuticle of frons with medium-sized plaques. Mesotibial posterior seta on fifth whorl present. Uppermost two circumanal setae on lower anal flap av1’ and av1 very finely serrated in female.

pruinosa
Cuticle of frons with large plaques. Mesotibial posterior seta on fifth whorl present. Uppermost two circumanal setae on lower anal flap av1’ and av1 generally lacerated in female.


References