http://www.collembola.org/key/odonidae.htm - Last updated on 2017.01.31 by Frans Janssens
Checklist of the Collembola: Key to the genera of Odontellidae

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).   Postantennal organ absent (fig.1a)............. Caufrenyllodes
        Postantennal organ present (fig.1b-d)....................... 2
 

Fig.1.
 
2(1).   Anal spines three (fig.2a)..................... Austrodontella
        Anal spines two or absent (fig.2b).......................... 3
 

Fig.2.
 
3(2).   Tenaculum absent............................................ 4
        Tenaculum present (fig.3)................................... 5
 

Fig.3.
 
4(3).   Postantennal organ with clear lobes (fig.4a).......... Stachia
        Postantennal organ without clear lobes (fig.4b).. Stachiomella
 

Fig.4.
 
5(3).   Mucro with one or no intermediate lamellae or teeth
          (fig.5a&b)................................................ 6
        Mucro with two intermediate lamellae or teeth (fig.5c)..... 10
 

Fig.5.
 
6(5).   Mucro with one intermediate lamella (fig.5a)..... Afrodontella
        Mucro without intermediate teeth or lamellae (fig.5b)....... 7
 
7(6).   Fourth antennal segment with apical bulb (fig.6b).............
           ............................................... Axenyllodes 1
        Fourth antennal segment without apical bulb (fig.6a)........ 8
 

Fig.6.
 
8(7).   Intermediate acuminate mucronal teeth absent................ 9
        Intermediate acuminate mucronal teeth present.................
           ............................................. Protodontella 3
 
9(8).   With 2 + 2 postlabial setae (fig.7b)............... Xenyllodes 5
        With 3 + 3 postlabial setae (fig.7a)......... Pseudoxenyllodes 4
 

Fig.7.
 
10(5).  Dens with 2 dorsal setae (fig.8a)................. Odontellina
        Dens with 3 - 7 dorsal setae (fig.8b)...................... 11
 

Fig.8.
 
11(10). Exsertile sac ventrally between third and fourth antennal
          segments absent (fig.9b)..................... Superodontella 6
        Exsertile sac ventrally between third and fourth antennal
          segments present (fig.9a)......................... Odontella 2

Fig.9.
 


Endnotes

1 Axenyllodes japonicus will key out here but may be separated by its peculiar, slender, apically coiled mucro.

2 Odontella s.s. This is a very difficult characteristic to ascertain but is the best we have to distinguish the subgenera.

3 Extinct genus.

4 Xenyllodes (Pseudoxenyllodes)

5 s.s.

6 Odontella (Superodontella)


Differential diagnoses

Afrodontella
Anal spines two or absent (fig.2b). Mucro with one intermediate lamella (fig.5a). Mucro with one or no intermediate lamellae or teeth (fig.5a&b). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Austrodontella
Anal spines three (fig.2a). Postantennal organ present (fig.1b-d).

Axenyllodes 1
Anal spines two or absent (fig.2b). Fourth antennal segment with apical bulb (fig.6b). Mucro without intermediate teeth or lamellae (fig.5b). Mucro with one or no intermediate lamellae or teeth (fig.5a&b). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Caufrenyllodes
Postantennal organ absent (fig.1a).

Odontella 2
Anal spines two or absent (fig.2b). Dens with 3 – 7 dorsal setae (fig.8b). Exsertile sac ventrally between third and fourth antennal segments present (fig.9a). Mucro with two intermediate lamellae or teeth (fig.5c). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Odontellina
Anal spines two or absent (fig.2b). Dens with 2 dorsal setae (fig.8a). Mucro with two intermediate lamellae or teeth (fig.5c). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Protodontella 3
Anal spines two or absent (fig.2b). Fourth antennal segment without apical bulb (fig.6a). Intermediate acuminate mucronal teeth present. Mucro without intermediate teeth or lamellae (fig.5b). Mucro with one or no intermediate lamellae or teeth (fig.5a&b). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Pseudoxenyllodes 4
Anal spines two or absent (fig.2b). Fourth antennal segment without apical bulb (fig.6a). Intermediate acuminate mucronal teeth absent. Mucro without intermediate teeth or lamellae (fig.5b). Mucro with one or no intermediate lamellae or teeth (fig.5a&b). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3). With 3 + 3 postlabial setae (fig.7a).

Stachia
Anal spines two or absent (fig.2b). Postantennal organ present (fig.1b-d). Postantennal organ with clear lobes (fig.4a). Tenaculum absent.

Stachiomella
Anal spines two or absent (fig.2b). Postantennal organ present (fig.1b-d). Postantennal organ without clear lobes (fig.4b). Tenaculum absent.

Superodontella 6
Anal spines two or absent (fig.2b). Dens with 3 – 7 dorsal setae (fig.8b). Exsertile sac ventrally between third and fourth antennal segments absent (fig.9b). Mucro with two intermediate lamellae or teeth (fig.5c). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3).

Xenyllodes 5
Anal spines two or absent (fig.2b). Fourth antennal segment without apical bulb (fig.6a). Intermediate acuminate mucronal teeth absent. Mucro without intermediate teeth or lamellae (fig.5b). Mucro with one or no intermediate lamellae or teeth (fig.5a&b). Postantennal organ present (fig.1b-d). Tenaculum present (fig.3). With 2 + 2 postlabial setae (fig.7b).


References