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

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.

Igor J. Kaprus', State Museum of Natural History, Ukrainian National Academy of Sciences, Teatral'na St.18, UA-79008 L'viv, Ukraine
Wanda M. Weiner, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, Pl-31016 Kraków, Poland
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). First thoracic tergum with 0 + 0 pseudocelli.................. 2
      First thoracic tergum with 1 + 1 pseudocelli.................. 6
 
2(1). Second thoracic tergum with 2 + 2 pseudocelli; third thoracic
        tergum with 2 + 2 pseudocelli............................... 3
      Second thoracic tergum with 3 + 3 pseudocelli; third thoracic
        tergum with 3 + 3 pseudocelli............................... 5
 
3(2). Abdominal sterna i, ii, iii and iv with 0 + 0, 0 + 0, 0 + 0 and
        1 + 1 pseudocelli respectively.............................. 4
      Abdominal sterna i, ii, iii and iv without pseudocelli..... daii
 
4(3). Pseudocellar formula dorsally: 32/022/22333; tibiotarsi with
        distal whorl composed of 9 chaetae..................... eremia
      Pseudocellar formula dorsally: 32/022/33343; tibiotarsi with
        distal whorl composed of 5 chaetae.................... steposa
 
5(2). Body length 0.7-0.8 mm; empodial appendage without distinct
        basal lamella; ventral tube with 6 + 6 setae......... raxensis
      Body length 1.0 mm; empodial appendage with broad basal lamella;
        ventral tube with 6-8 + 6-8 setae.................. chatyrdagi
 
6(1). Second thoracic tergum with 2 + 2 pseudocelli; third thoracic
        tergum with 2 + 2 pseudocelli, pseudocellar formula dorsally:
        32/122/23333................................ quadrituberculata
      Second thoracic tergum with 3 + 3 pseudocelli; third thoracic
        tergum with 3 + 3 pseudocelli............................... 7
 
7(6). Fourth abdominal sternum with 1 + 1 pseudocelli; pseudocellar
        formula dorsally: 32/133/33343.............................. 8
      Fourth abdominal sternum without pseudocelli; pseudocellar
        formula dorsally: 32/133/33353................. pseudoraxensis
 
8(7). Tibiotarsi with distal whorl composed of 11 chaetae........ alna
      Tibiotarsi with distal whorl composed of 9 chaetae....... irinae

Differential diagnoses

alna
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal sternum with 1 + 1 pseudocelli. Pseudocellar formula dorsally: 32/133/33343. Second thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with 3 + 3 pseudocelli. Tibiotarsi with distal whorl composed of 11 chaetae.

chatyrdagi
Body length 1.0 mm. Empodial appendage with broad basal lamella. First thoracic tergum with 0 + 0 pseudocelli. Second thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with 3 + 3 pseudocelli. Ventral tube with 6–8 + 6–8 setae.

daii
Abdominal sterna i, ii, iii and iv without pseudocelli. First thoracic tergum with 0 + 0 pseudocelli. Second thoracic tergum with 2 + 2 pseudocelli. Third thoracic tergum with 2 + 2 pseudocelli.

eremia
Abdominal sterna i, ii, iii and iv with 0 + 0, 0 + 0, 0 + 0 and 1 + 1 pseudocelli respectively. First thoracic tergum with 0 + 0 pseudocelli. Pseudocellar formula dorsally: 32/022/22333. Second thoracic tergum with 2 + 2 pseudocelli. Third thoracic tergum with 2 + 2 pseudocelli. Tibiotarsi with distal whorl composed of 9 chaetae.

irinae
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal sternum with 1 + 1 pseudocelli. Pseudocellar formula dorsally: 32/133/33343. Second thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with 3 + 3 pseudocelli. Tibiotarsi with distal whorl composed of 9 chaetae.

pseudoraxensis
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal sternum without pseudocelli. Pseudocellar formula dorsally: 32/133/33353. Second thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with 3 + 3 pseudocelli.

quadrituberculata
First thoracic tergum with 1 + 1 pseudocelli. Second thoracic tergum with 2 + 2 pseudocelli. Third thoracic tergum with 2 + 2 pseudocelli, pseudocellar formula dorsally: 32/122/23333.

raxensis
Body length 0.7–0.8 mm. Empodial appendage without distinct basal lamella. First thoracic tergum with 0 + 0 pseudocelli. Second thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with 3 + 3 pseudocelli. Ventral tube with 6 + 6 setae.

steposa
Abdominal sterna i, ii, iii and iv with 0 + 0, 0 + 0, 0 + 0 and 1 + 1 pseudocelli respectively. First thoracic tergum with 0 + 0 pseudocelli. Pseudocellar formula dorsally: 32/022/33343. Second thoracic tergum with 2 + 2 pseudocelli. Third thoracic tergum with 2 + 2 pseudocelli. Tibiotarsi with distal whorl composed of 5 chaetae.


References