http://www.collembola.org/key/diversus.htm - Last updated on 2017.06.30 by Frans Janssens
Checklist of the Collembola: Key to the species of the diversus group of Arrhopalites

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.

Robert S. Vargovitsh, Schmalhausen Institute of Zoology NAS of Ukraine, Kiev, 01601, 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). Cuticular spines on sixth abdominal segment absent............ 2
      Cuticular spines on sixth abdominal segment present........... 6
 
2(1). Head dorsum with about 13 spine-like setae; tenaculum with 1
        seta........................................................ 3
      Head dorsum with not spine-like setae; tenaculum without setae..
         .............................................. microphthalmus
 
3(2). Circumanal setae distinctly broadened......................... 4
      Circumanal setae not broadened......................... ezoensis
 
4(3). Claws with long filamentous inner tooth................ diversus
      Claws without long filamentous or with uncertain inner tooth.. 5
 
5(4). Appendices anales gutter-like, with fringed apex and edges......
         .................................................... antonioi
      Appendices anales rod-like and smooth.......... acanthophthalmus
 
6(1). Appendices anales apically pointed, without serration;
        anterodistal seta of dens Ia spine-like; empodium of first leg
        with corner tooth; empodium of third leg with corner tooth;
        first claw without inner tooth........................ nivalis
      Appendices anales with cut and apically serrated tip;
        anterodistal seta of dens Ia not spine-like; empodium of first
        leg without corner tooth; empodium of third leg without corner
        tooth; first claw with inner tooth.................. baccettii

Differential diagnoses

acanthophthalmus
Appendices anales rod-like and smooth. Circumanal setae distinctly broadened. Claws without long filamentous or with uncertain inner tooth. Cuticular spines on sixth abdominal segment absent. Head dorsum with about 13 spine-like setae. Tenaculum with 1 seta.

antonioi
Appendices anales gutter-like, with fringed apex and edges. Circumanal setae distinctly broadened. Claws without long filamentous or with uncertain inner tooth. Cuticular spines on sixth abdominal segment absent. Head dorsum with about 13 spine-like setae. Tenaculum with 1 seta.

baccettii
Anterodistal seta of dens Ia not spine-like. Appendices anales with cut and apically serrated tip. Cuticular spines on sixth abdominal segment present. Empodium of first leg without corner tooth. Empodium of third leg without corner tooth. First claw with inner tooth. Head dorsum with slightly thickened but not spine-like setae.

diversus
Circumanal setae distinctly broadened. Claws with long filamentous inner tooth. Cuticular spines on sixth abdominal segment absent. Head dorsum with about 13 spine-like setae. Tenaculum with 1 seta.

ezoensis
Circumanal setae not broadened. Cuticular spines on sixth abdominal segment absent. Head dorsum with about 13 spine-like setae. Tenaculum with 1 seta.

microphthalmus
Cuticular spines on sixth abdominal segment absent. Head dorsum with not spine-like setae. Tenaculum without setae.

nivalis
Anterodistal seta of dens Ia spine-like. Appendices anales apically pointed, without serration. Cuticular spines on sixth abdominal segment present. Empodium of first leg with corner tooth. Empodium of third leg with corner tooth. First claw without inner tooth. Head dorsum with distinctly spine-like setae.


References