http://www.collembola.org/key/bracidae.htm - Last updated on 2017.02.28 by Frans Janssens
Checklist of the Collembola: Key to the genera of Brachystomellidae

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.

Rationale

Check the rationale for taxa used and not used as well as subtaxonomic classification for some taxa.

Key

Note that no distinction between subtaxa and taxa is made in the key.

   
1(0).   Furcula absent.............................................. 2
        Furcula present (fig.1)..................................... 3
 

Fig.1.
 
2(1).   Eyes absent........................................ Micronella
        Eyes present....................................... Setanodosa
 
3(1).   Postantennal organ absent................................... 4
        Postantennal organ present (fig.2).......................... 9
 

Fig.2.
 
4(3).   Mucro absent (fig.1a).............................. Winterella
        Mucro present (fig.1b&c).................................... 5
 
5(4).   Mucro fused to dens (fig.1b)..................... Parastomella
        Mucro separate from dens (fig.1c)........................... 6
 
6(5).   Eyes absent........................................ Maricaella
        Eyes present................................................ 7
 
7(6).   Dens with some thickened setae (fig.3a)........ Subclavontella
        Dens without thickened setae (fig.3b)....................... 8
 

Fig.3.
 
8(7).   Maxillae quadrate with forward projecting teeth (fig.4a)......
           ................................................. Bonetella
        Maxillae with inward curving teeth (fig.4b)........ Salvarella
 

Fig.4.
 
9(3).   Mucro absent or when present with straight or no lamellae
          (fig.5c&d)............................................... 10
        Mucro with curved lamellae (fig.5a&b)...................... 15
 

Fig.5.
 
10(9).  Eyes absent....................................... Folsomiella
        Eyes present............................................... 11
 
11(10). Eyes 6 + 6.......................................... Raponella
        Eyes 8 + 8................................................. 12
 
12(11). Maxillae quadrate with many forward projecting teeth (fig.6a).
           ............................................ Brachystomella
        Maxillae reduced (fig.6b&c) or with inward projecting teeth
          (fig.6d)................................................. 13
 

Fig.6.
 
13(12). Maxillae reduced with only 1 or two clear teeth (fig.6b&c)....
           ...................................... Probrachystomellides
        Maxillae well developed with 4 or more clear teeth (fig.6d&e).
           ........................................................ 14
 
14(13). Tibiotarsi with 1 or no clavate tenent hairs (fig.7b).........
           .............................................. Rapoportella
        Tibiotarsi with 3 clavate tenent hairs (fig.7a)... Cassagnella
 

Fig.7.
 
15(9).  Ventral file absent or of peg like or conical setae (fig.8b)..
           ......................................... Brachystomellides
        Ventral file of fourth antennal segment of short clavate setae
          (fig.8a)........................................ Massoudella

Fig.8.
 


Differential diagnoses

Bonetella
Dens without thickened setae (fig.3b). Eyes present. Furcula present (fig.1). Maxillae quadrate with forward projecting teeth (fig.4a). Mucro present (fig.1b&c). Mucro separate from dens (fig.1c). Postantennal organ absent.

Brachystomella
Eyes present. Eyes 8 + 8. Furcula present (fig.1). Maxillae quadrate with many forward projecting teeth (fig.6a). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2).

Brachystomellides
Furcula present (fig.1). Mucro with curved lamellae (fig.5a&b). Postantennal organ present (fig.2). Ventral file absent or of peg like or conical setae (fig.8b).

Cassagnella
Eyes present. Eyes 8 + 8. Furcula present (fig.1). Maxillae reduced (fig.6b&c) or with inward projecting teeth (fig.6d). Maxillae well developed with 4 or more clear teeth (fig.6d&e). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2). Tibiotarsi with 3 clavate tenent hairs (fig.7a).

Folsomiella
Eyes absent. Furcula present (fig.1). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2).

Maricaella
Eyes absent. Furcula present (fig.1). Mucro present (fig.1b&c). Mucro separate from dens (fig.1c). Postantennal organ absent.

Massoudella
Furcula present (fig.1). Mucro with curved lamellae (fig.5a&b). Postantennal organ present (fig.2). Ventral file of fourth antennal segment of short clavate setae (fig.8a).

Micronella
Eyes absent. Furcula absent.

Parastomella
Furcula present (fig.1). Mucro present (fig.1b&c). Mucro fused to dens (fig.1b). Postantennal organ absent.

Probrachystomellides
Eyes present. Eyes 8 + 8. Furcula present (fig.1). Maxillae reduced (fig.6b&c) or with inward projecting teeth (fig.6d). Maxillae reduced with only 1 or two clear teeth (fig.6b&c). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2).

Raponella
Eyes present. Eyes 6 + 6. Furcula present (fig.1). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2).

Rapoportella
Eyes present. Eyes 8 + 8. Furcula present (fig.1). Maxillae reduced (fig.6b&c) or with inward projecting teeth (fig.6d). Maxillae well developed with 4 or more clear teeth (fig.6d&e). Mucro absent or when present with straight or no lamellae (fig.5c&d). Postantennal organ present (fig.2). Tibiotarsi with 1 or no clavate tenent hairs (fig.7b).

Salvarella
Dens without thickened setae (fig.3b). Eyes present. Furcula present (fig.1). Maxillae with inward curving teeth (fig.4b). Mucro present (fig.1b&c). Mucro separate from dens (fig.1c). Postantennal organ absent.

Setanodosa
Eyes present. Furcula absent.

Subclavontella
Dens with some thickened setae (fig.3a). Eyes present. Furcula present (fig.1). Mucro present (fig.1b&c). Mucro separate from dens (fig.1c). Postantennal organ absent.

Winterella
Furcula present (fig.1). Mucro absent (fig.1a). Postantennal organ absent.


References