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

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.

László Dányi, Department of Zoology, Hungarian Natural History Museum, H-1088 Budapest, Hungary.
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). Dorsoexternal tubercle of second thoracic segment with four
        chaetae (fig.1)............................................. 2
      Dorsoexternal tubercle of second thoracic segment with three
        chaetae..................................................... 7
 

Fig.1.
 
2(1). Tubercles of fourth to sixth abdominal segment cylindrically
        elongated, fingerlike (fig.2a).............................. 3
      Tubercles of fourth to sixth abdominal segment hemispheric in
        shape (fig.2b).............................................. 6
 

Fig.2.
 
3(2). Dorsoexternal tubercle of first thoracic segment with three
        chaetae (fig.3)...................................... mahunkai
      Dorsoexternal tubercle of first thoracic segment with two
        chaetae..................................................... 4
 

Fig.3.
 
4(3). Dorsoexternal tubercle and dorsolateral tubercle of first to
        third abdominal segment with 3 and 2 chaetae respectively... 5
      Dorsoexternal tubercle and dorsolateral tubercle of first to
        third abdominal segment with 4 chaetae each............. zekoi
 
5(4). Integumental granulation forming neither papillae nor
        reticulation; ratio of long macrochaetae to short macrochaetae
        : 4-6.5.............................................. digitata
      Integumental granulation forming reticulation and conifer
        cone-like papillae; ratio of long macrochaetae to short
        macrochaetae : about 1.25........................... coiffaiti
 
6(2). Fused dorsoexternal and dorsolateral tubercle of fourth
        abdominal segment with five chaetae (fig.4)......... matsakisi
      Fused dorsoexternal and dorsolateral tubercle of fourth
        abdominal segment with six chaetae.................... proxima
 

Fig.4.
 
7(1). O chaeta on head absent....................................... 8
      O chaeta on head present............................... albanica
 
8(7). Claws with tooth.................................. subaurantiaca
      Claws without tooth........................................... 9
 
9(8). Fused dorsointernal and dorsoexternal tubercle of head with 3
        chaetae............................................ aurantiaca
      Fused dorsointernal and dorsoexternal tubercle of head with 4
        chaetae.............................................. massoudi


Differential diagnoses

albanica
O chaeta on head present. Dorsoexternal tubercle of second thoracic segment with three chaetae.

aurantiaca
O chaeta on head absent. Claws without tooth. Dorsoexternal tubercle of second thoracic segment with three chaetae. Fused dorsointernal and dorsoexternal tubercle of head with 3 chaetae.

coiffaiti
Dorsoexternal tubercle and dorsolateral tubercle of first to third abdominal segment with 3 and 2 chaetae respectively. Dorsoexternal tubercle of first thoracic segment with two chaetae. Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Integumental granulation forming reticulation and conifer cone-like papillae. Ratio of long macrochaetae to short macrochaetae : about 1.25. Tubercles of fourth to sixth abdominal segment cylindrically elongated, fingerlike (fig.2a).

digitata
Dorsoexternal tubercle and dorsolateral tubercle of first to third abdominal segment with 3 and 2 chaetae respectively. Dorsoexternal tubercle of first thoracic segment with two chaetae. Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Integumental granulation forming neither papillae nor reticulation. Ratio of long macrochaetae to short macrochaetae : 4–6.5. Tubercles of fourth to sixth abdominal segment cylindrically elongated, fingerlike (fig.2a).

mahunkai
Dorsoexternal tubercle of first thoracic segment with three chaetae (fig.3). Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Tubercles of fourth to sixth abdominal segment cylindrically elongated, fingerlike (fig.2a).

massoudi
O chaeta on head absent. Claws without tooth. Dorsoexternal tubercle of second thoracic segment with three chaetae. Fused dorsointernal and dorsoexternal tubercle of head with 4 chaetae.

matsakisi
Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Fused dorsoexternal and dorsolateral tubercle of fourth abdominal segment with five chaetae (fig.4). Tubercles of fourth to sixth abdominal segment hemispheric in shape (fig.2b).

proxima
Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Fused dorsoexternal and dorsolateral tubercle of fourth abdominal segment with six chaetae. Tubercles of fourth to sixth abdominal segment hemispheric in shape (fig.2b).

subaurantiaca
O chaeta on head absent. Claws with tooth. Dorsoexternal tubercle of second thoracic segment with three chaetae.

zekoi
Dorsoexternal tubercle and dorsolateral tubercle of first to third abdominal segment with 4 chaetae each. Dorsoexternal tubercle of first thoracic segment with two chaetae. Dorsoexternal tubercle of second thoracic segment with four chaetae (fig.1). Tubercles of fourth to sixth abdominal segment cylindrically elongated, fingerlike (fig.2a).


References