http://www.collembola.org/key/onycurus.htm - Last updated on 2009.09.30 by Frans Janssens
Checklist of the Collembola: Key to the species of Onychiurus partim obsiones group

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.

Ighor J. Kaprus, State Natural History Museum of NAS of Ukraine, UA-79008, L'viv, Ukraine
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). Sense organ of third antennal segment with 4 papillae (fig.1a)..
         ........................................................... 2
      Sense organ of third antennal segment with 5 papillae (fig.1b)..
         ........................................................... 3

Fig.1.
   
2(1). Formula of parapseudocelli on abdominal sterna as 111000;
        microsensillum on fourth antennal segment is situated in the
        triangle formed by a, b and c chaetae (fig.2a)........ vtorovi
      Formula of parapseudocelli on abdominal sterna as 111011m;
        microsensillum on fourth antennal segment is situated outside
        the triangle formed by a, b and c chaetae (fig.2b)...... darii

Fig.2.
   
3(1). First thoracic tergum with 6 + 6 setae; distal whorl on
        tibiotarsi composed of 7 setae.............................. 4
      First thoracic tergum with 7 + 7 setae; distal whorl on
        tibiotarsi composed of 9 setae......................... jaceki
 

4(3). Formula of pseudocelli on abdominal sterna as 00010; sense organ
        of third antennal segment with 4 guard setae (fig.3a)....... 5
      Formula of pseudocelli on abdominal sterna as 00011; sense organ
        of third antennal segment with 5 guard setae (fig.3b).........
         .................................................. sarmaticus

Fig.3.
   
5(4). Fifth abdominal tergum with a3 as macrosetae (fig.4a); ventral
        tube with 1 + 1 setae at base........................ obsiones
      Fifth abdominal tergum with a3 as microsetae (fig.4b); ventral
        tube without setae at base..................... orienteuropeus

Fig.4.
  

Differential diagnoses

darii
Formula of parapseudocelli on abdominal sterna as 111011m. Microsensillum on fourth antennal segment is situated outside the triangle formed by a, b and c chaetae (fig.2b). Sense organ of third antennal segment with 4 papillae (fig.1a).

jaceki
Distal whorl on tibiotarsi composed of 9 setae. First thoracic tergum with 7 + 7 setae. Sense organ of third antennal segment with 5 papillae (fig.1b).

obsiones
Distal whorl on tibiotarsi composed of 7 setae. Fifth abdominal tergum with a3 as macrosetae (fig.4a). First thoracic tergum with 6 + 6 setae. Formula of pseudocelli on abdominal sterna as 00010. Sense organ of third antennal segment with 5 papillae (fig.1b). Sense organ of third antennal segment with 4 guard setae (fig.3a). Ventral tube with 1 + 1 setae at base.

orienteuropeus
Distal whorl on tibiotarsi composed of 7 setae. Fifth abdominal tergum with a3 as microsetae (fig.4b). First thoracic tergum with 6 + 6 setae. Formula of pseudocelli on abdominal sterna as 00010. Sense organ of third antennal segment with 5 papillae (fig.1b). Sense organ of third antennal segment with 4 guard setae (fig.3a). Ventral tube without setae at base.

sarmaticus
Distal whorl on tibiotarsi composed of 7 setae. First thoracic tergum with 6 + 6 setae. Formula of pseudocelli on abdominal sterna as 00011. Sense organ of third antennal segment with 5 papillae (fig.1b). Sense organ of third antennal segment with 5 guard setae (fig.3b).

vtorovi
Formula of parapseudocelli on abdominal sterna as 111000. Microsensillum on fourth antennal segment is situated in the triangle formed by a, b and c chaetae (fig.2a). Sense organ of third antennal segment with 4 papillae (fig.1a).

References