http://www.collembola.org/key/onychrus.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Onychiurus partim North America

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.

Romuald J. Pomorski, Department of Biodiversity and Evolutionary Taxonomy, Zoological Institute, Wroclaw University, PL-51-148 Wroclaw, Poland
Michal Furgol, Department of Biodiversity and Evolutionary Taxonomy, Zoological Institute, Wroclaw University, PL-51-148 Wroclaw, Poland
Kenneth A. Christiansen, Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
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). Empodial appendage with basal lamella (fig.1a)....... nathanieli
      Empodial appendage without basal lamella (fig.1b)............. 2
 

Fig.1.
 
2(1). First thoracic tergum with 1 + 1 pseudocelli (fig.2).......... 3
      First thoracic tergum without pseudocelli............ steinmanni 1
 

Fig.2.
 
3(2). Second abdominal sternum with 1 + 1 pseudocelli (fig.3b)........
         .................................................... reluctus
      Second abdominal sternum with 2 + 2 pseudocelli (fig.3a)...... 4
 

Fig.3.
 
4(3). Fifth abdominal tergum with 3 + 3 pseudocelli...... furcisetosus
      Fifth abdominal tergum with 4 + 4 pseudocelli....... reluctoides


Endnotes

1 O. wilchi will key out here, but the collection sites make it improbable that they are the same species.


Differential diagnoses

furcisetosus
Empodial appendage without basal lamella (fig.1b). Fifth abdominal tergum with 3 + 3 pseudocelli. First thoracic tergum with 1 + fig.1 pseudocelli (fig.2). Second abdominal sternum with 2 + 2 pseudocelli (fig.3a).

nathanieli
Empodial appendage with basal lamella (fig.1a).

reluctoides
Empodial appendage without basal lamella (fig.1b). Fifth abdominal tergum with 4 + 4 pseudocelli. First thoracic tergum with 1 + fig.1 pseudocelli (fig.2). Second abdominal sternum with 2 + 2 pseudocelli (fig.3a).

reluctus
Empodial appendage without basal lamella (fig.1b). First thoracic tergum with 1 + 1 pseudocelli (fig.2). Second abdominal sternum with 1 + 1 pseudocelli (fig.3b).

steinmanni 1
Empodial appendage without basal lamella (fig.1b). First thoracic tergum without pseudocelli.


References