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

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.

Yan Gao, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
Yun Bu, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
José G. Palacios-Vargas, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
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).   Cephalic ocular tubercle with 1 or 2 setae.................. 2
        Cephalic ocular tubercle with 3 setae...................... 12
 
2(1).   Cephalic ocular tubercle with 1 seta........................ 3
        Cephalic ocular tubercle with 2 setae....................... 4
 
3(2).   Cephalic antennal tubercle with 1 seta................ mascula
        Cephalic antennal tubercle with 2 setae.......... shaanxiensis
 
4(2).   Dorso-internal tubercles on head fused along midline..........
           ................................................. tubercula
        Dorso-internal tubercles on head separate................... 5
 
5(4).   Cephalic seta O absent...................................... 6
        Cephalic seta O present..................................... 9
 
6(5).   Dorso-internal tubercles on fifth abdominal segment fused
          along midline........................................ sinica
        Dorso-internal tubercles on fifth abdominal segment separate..
           ......................................................... 7
 
7(6).   Dorso-external tubercle of second thoracic segment with 4
          setae..................................................... 8
        Dorso-external tubercle of second thoracic segment with 5
          setae.............................................. luzonica
 
8(7).   Cephalic antennal tubercle with E seta; cephalic antennal
          tubercle with C seta.............................. gressitti
        Cephalic antennal tubercle without E seta; cephalic antennal
          tubercle without C seta....................... kunigamiensis
 
9(5).   Dorso-internal tubercles on first thoracic segment with 1
          seta..................................................... 10
        Dorso-internal tubercles on first thoracic segment with 2
          setae................................................ latior
 
10(9).  Claw with inner tooth...................................... 11
        Claw without inner tooth............................ mandarina
 
11(10). Dorso-internal tubercle on fifth abdominal segment with 2
          setae.......................................... namhaeiensis
        Dorso-internal tubercle on fifth abdominal segment with 3
          setae............................................... pygmaea
 
12(1).  Cephalic dorso-external tubercle with 2 setae.......... joanna
        Cephalic dorso-external tubercle with 3 setae.............. 13
 
13(12). Cephalic dorso-internal tubercles distinctly separate...... 14
        Cephalic dorso-internal tubercles fused or weakly fused along
          midline.................................................. 18
 
14(13). Claw with inner tooth...................................... 15
        Claw without inner tooth................................... 16
 
15(14). Combined dorso-external and dorso-lateral tubercle of fifth
          abdominal segment with 4 setae; mandible with 3 denticles...
           ................................................... dentata
        Combined dorso-external and dorso-lateral tubercle of fifth
          abdominal segment with 5 setae; mandible with 5 denticles...
           ............................................ qingchengensis
 
16(14). Head with 12 tubercles..................................... 17
        Head with 14 tubercles........................... quartadecima
 
17(16). Labrum distally non-ogival; ventro-external tubercle of fourth
          abdominal segment with 10 setae..................... giselae
        Labrum distally ogival; ventro-external tubercle of fourth
          abdominal segment with 7-9 setae...................... acuta
 
18(13). Cephalic seta O absent......................... singaporiensis
        Cephalic seta O present.................................... 19
 
19(18). Dorso-internal tubercle of first abdominal segment absent.....
           ............................................ setaebarbulata
        Dorso-internal tubercle of first abdominal segment present....
           ............................................. macgillivrayi

Differential diagnoses

acuta
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles distinctly separate. Cephalic ocular tubercle with 3 setae. Claw without inner tooth. Head with 12 tubercles. Labrum distally ogival. Ventro-external tubercle of fourth abdominal segment with 7–9 setae.

dentata
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles distinctly separate. Cephalic ocular tubercle with 3 setae. Claw with inner tooth. Combined dorso-external and dorso-lateral tubercle of fifth abdominal segment with 4 setae. Mandible with 3 denticles.

giselae
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles distinctly separate. Cephalic ocular tubercle with 3 setae. Claw without inner tooth. Head with 12 tubercles. Labrum distally non-ogival. Ventro-external tubercle of fourth abdominal segment with 10 setae.

gressitti
Cephalic antennal tubercle with C seta. Cephalic antennal tubercle with E seta. Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O absent. Dorso-external tubercle of second thoracic segment with 4 setae. Dorso-internal tubercles on fifth abdominal segment separate. Dorso-internal tubercles on head separate.

joanna
Cephalic dorso-external tubercle with 2 setae. Cephalic ocular tubercle with 3 setae.

kunigamiensis
Cephalic antennal tubercle without C seta. Cephalic antennal tubercle without E seta. Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O absent. Dorso-external tubercle of second thoracic segment with 4 setae. Dorso-internal tubercles on fifth abdominal segment separate. Dorso-internal tubercles on head separate.

latior
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O present. Dorso-internal tubercles on first thoracic segment with 2 setae. Dorso-internal tubercles on head separate.

luzonica
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O absent. Dorso-external tubercle of second thoracic segment with 5 setae. Dorso-internal tubercles on fifth abdominal segment separate. Dorso-internal tubercles on head separate.

macgillivrayi
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles fused or weakly fused along midline. Cephalic ocular tubercle with 3 setae. Cephalic seta O present. Dorso-internal tubercle of first abdominal segment present.

mandarina
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O present. Claw without inner tooth. Dorso-internal tubercles on first thoracic segment with 1 seta. Dorso-internal tubercles on head separate.

mascula
Cephalic antennal tubercle with 1 seta. Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 1 seta.

namhaeiensis
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O present. Claw with inner tooth. Dorso-internal tubercle on fifth abdominal segment with 2 setae. Dorso-internal tubercles on first thoracic segment with 1 seta. Dorso-internal tubercles on head separate.

pygmaea
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O present. Claw with inner tooth. Dorso-internal tubercle on fifth abdominal segment with 3 setae. Dorso-internal tubercles on first thoracic segment with 1 seta. Dorso-internal tubercles on head separate.

qingchengensis
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles distinctly separate. Cephalic ocular tubercle with 3 setae. Claw with inner tooth. Combined dorso-external and dorso-lateral tubercle of fifth abdominal segment with 5 setae. Mandible with 5 denticles.

quartadecima
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles distinctly separate. Cephalic ocular tubercle with 3 setae. Claw without inner tooth. Head with 14 tubercles.

setaebarbulata
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles fused or weakly fused along midline. Cephalic ocular tubercle with 3 setae. Cephalic seta O present. Dorso-internal tubercle of first abdominal segment absent.

shaanxiensis
Cephalic antennal tubercle with 2 setae. Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 1 seta.

singaporiensis
Cephalic dorso-external tubercle with 3 setae. Cephalic dorso-internal tubercles fused or weakly fused along midline. Cephalic ocular tubercle with 3 setae. Cephalic seta O absent.

sinica
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Cephalic seta O absent. Dorso-internal tubercles on fifth abdominal segment fused along midline. Dorso-internal tubercles on head separate.

tubercula
Cephalic ocular tubercle with 1 or 2 setae. Cephalic ocular tubercle with 2 setae. Dorso-internal tubercles on head fused along midline.


References