http://www.collembola.org/key/fkfr.htm - Last updated on 2017.02.28 by Frans Janssens
Checklist of the Collembola: Pictorial key to common surface dwelling families of Collembola from France

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.

Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
Philippe Lebeaux France

Preamble

This experimental, simplified and macrophotographically illustrated key is intended to key out up to family level the most common surface dwelling Collembola from France, based on habitus inspection of alive specimens in the field using at most a magnification of 5 times.

All illustrations courtesy of macrophotographer Philippe Lebeaux.

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).   Body shape elongate (fig.1a)................................ 2
        Body shape subglobular (fig.1b)............................. 9
 

Fig.1.
 
2(1).   Antennae longer than head; first thoracic tergite absent
          (fig.2b); legs long; trunk segmentation outline smooth
          (fig.2b).................................................. 3
        Antennae shorter than head; first thoracic tergite present
          (fig.2a); legs short; trunk segmentation outline bumpy
          (fig.2a).................................................. 6
 

Fig.2.
 
3(2).   Third antennal segment distinctly longer than other antennal
          segments (fig.3)................................ Tomoceridae
        Third antennal segment not distinctly longer than other
          antennal segments......................................... 4
 

Fig.3.
 
4(3).   Eyes absent (fig.4)............................. Cyphoderinae
        Eyes present................................................ 5
 

Fig.4.
 
5(4).   Fourth abdominal segment as long as third abdominal segment
          (fig.5)......................................... Isotomidae
        Fourth abdominal segment longer than third abdominal segment
          (fig.6)...................................... Entomobryidae
 

Fig.5.
 

Fig.6.
 
6(2).   Sixth abdominal segment bilobed (fig.7)............ Neanurinae
        Sixth abdominal segment monolobed........................... 7
 

Fig.7.
 
7(6).   Sixth abdominal segment in dorsal aspect pointed............ 8
        Sixth abdominal segment in dorsal aspect rounded (fig.8)......
           ................................................. Poduridae
 

Fig.8.
 
8(7).   Eyes absent; body pigment absent (fig.9)......... Onychiuridae
        Eyes present; body pigment present (fig.10).... Hypogastruridae
 

Fig.9.
 

Fig.10.
 
9(1).   Eyes not reduced........................................... 10
        Eyes reduced (fig.11).......................... Arrhopalitidae
 

Fig.11.
 
10(9).  Fourth antennal segment distinctly shorter than third antennal
          segment (fig.12)................................ Dicyrtomidae
        Fourth antennal segment longer than third antennal segment. 11
 

Fig.12.
 
11(10). Trunk dorsally with many macrosetae (fig.13)...... Sminthuridae
        Trunk without distinct macrosetae.......................... 12
 

Fig.13.
 
12(11). Male with modified clasping antennae (fig.14).. Sminthurididae
        Male with unmodified antennae.............................. 13
 

Fig.14.
 
13(12). Fourth antennal segment not subdivided (fig.15)... Katiannidae
        Fourth antennal segment subdivided (fig.16)... Bourletiellidae

Fig.15.
 

Fig.16.
 


Differential diagnoses

Arrhopalitidae
Body shape subglobular (fig.1b). Eyes reduced (fig.11).

Bourletiellidae
Body shape subglobular (fig.1b). Eyes not reduced. Fourth antennal segment subdivided (fig.16). Fourth antennal segment longer than third antennal segment. Male with unmodified antennae. Trunk without distinct macrosetae.

Cyphoderinae
Antennae longer than head. Body shape elongate (fig.1a). Eyes absent (fig.4). First thoracic tergite absent (fig.2b). Legs long. Third antennal segment not distinctly longer than other antennal segments. Trunk segmentation outline smooth (fig.2b).

Dicyrtomidae
Body shape subglobular (fig.1b). Eyes not reduced. Fourth antennal segment distinctly shorter than third antennal segment (fig.12).

Entomobryidae
Antennae longer than head. Body shape elongate (fig.1a). Eyes present. First thoracic tergite absent (fig.2b). Fourth abdominal segment longer than third abdominal segment (fig.6). Legs long. Third antennal segment not distinctly longer than other antennal segments. Trunk segmentation outline smooth (fig.2b).

Hypogastruridae
Antennae shorter than head. Body pigment present (fig.10). Body shape elongate (fig.1a). Eyes present. First thoracic tergite present (fig.2a). Legs short. Sixth abdominal segment monolobed. Sixth abdominal segment in dorsal aspect pointed. Trunk segmentation outline bumpy (fig.2a).

Isotomidae
Antennae longer than head. Body shape elongate (fig.1a). Eyes present. First thoracic tergite absent (fig.2b). Fourth abdominal segment as long as third abdominal segment (fig.5). Legs long. Third antennal segment not distinctly longer than other antennal segments. Trunk segmentation outline smooth (fig.2b).

Katiannidae
Body shape subglobular (fig.1b). Eyes not reduced. Fourth antennal segment not subdivided (fig.15). Fourth antennal segment longer than third antennal segment. Male with unmodified antennae. Trunk without distinct macrosetae.

Neanurinae
Antennae shorter than head. Body shape elongate (fig.1a). First thoracic tergite present (fig.2a). Legs short. Sixth abdominal segment bilobed (fig.7). Trunk segmentation outline bumpy (fig.2a).

Onychiuridae
Antennae shorter than head. Body pigment absent (fig.9). Body shape elongate (fig.1a). Eyes absent. First thoracic tergite present (fig.2a). Legs short. Sixth abdominal segment monolobed. Sixth abdominal segment in dorsal aspect pointed. Trunk segmentation outline bumpy (fig.2a).

Poduridae
Antennae shorter than head. Body shape elongate (fig.1a). First thoracic tergite present (fig.2a). Legs short. Sixth abdominal segment monolobed. Sixth abdominal segment in dorsal aspect rounded (fig.8). Trunk segmentation outline bumpy (fig.2a).

Sminthuridae
Body shape subglobular (fig.1b). Eyes not reduced. Fourth antennal segment longer than third antennal segment. Trunk dorsally with many macrosetae (fig.13).

Sminthurididae
Body shape subglobular (fig.1b). Eyes not reduced. Fourth antennal segment longer than third antennal segment. Male with modified clasping antennae (fig.14). Trunk without distinct macrosetae.

Tomoceridae
Antennae longer than head. Body shape elongate (fig.1a). First thoracic tergite absent (fig.2b). Legs long. Third antennal segment distinctly longer than other antennal segments (fig.3). Trunk segmentation outline smooth (fig.2b).


References