http://www.collembola.org/key/lepiinae.htm - Last updated on 2015.09.14 by Frans Janssens
Checklist of the Collembola: Key to the genera of Entomobryinae

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

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).   Head with 6 + 6 or fewer eyes............................... 2
        Head with 8 + 8 eyes........................................ 6
 
2(1).   Mucronal lamella absent..................................... 3
        Mucronal lamella projecting from end of dens (fig.1a)...... 5
 

Fig.1.
 
3(2).   Mucro bidentate (fig.1c)................................... 4
        Mucro falcate..................................... Sinelloides
 
4(3).   Fourth antennal segment greatly swollen (fig.2)..............
           ............................................. Rambutsinella
        Fourth antennal segment not greatly swollen..... Pseudosinella
 

Fig.2.
 
5(2).   Antennae less than .5 times as long as head and body combined.
           ................................................. Sulcuncus
        Antennae more than 1.4 times as long as head and body
          combined........................................ Metasinella
 
6(1).   Dental spines absent........................................ 7
        Dental spines present (fig.3)................... Acanthurella
 

Fig.3.
 
7(6).   Body scales all rounded or truncate (fig.4c&d); body scales
          striated finely........................................... 8
        Body scales some apically pointed (fig.4a&b); body scales
          striated heavily................................... Vietsira
 

Fig.4.
 
8(7).   Dental basal appendix absent................................ 9
        Dental basal appendix present (fig.5)..................... 10
 

Fig.5.
 
9(8).   Antennae and legs not scaled....................... Lanocyrtus
        Antennae and legs scaled......................... Lepidocyrtus
 
10(8).  Dental appendix pointed (fig.5b).......................... 11
        Dental appendix rounded (fig.5a).......................... 13
 
11(10). Ventral tube scales absent......................... Acrocyrtus
        Ventral tube scales present................................ 12
 
12(11). Ventral tube scaled on both faces................. Onerocyrtus
        Ventral tube scaled on posterior face only......... Carocyrtus
 
13(10). Mucronal basal spine simple................................ 14
        Mucronal basal spine with spinelet (fig.6)........ Setogaster
 

Fig.6.
 
14(13). First antennal segment and femur not scaled................ 15
        First antennal segment and femur scaled............ Dahlcyrtus
 
15(14). Mouthparts not projecting........................ Cinctocyrtus
        Mouthparts projecting, labrum (fig.7a), labium (fig.7b) and
          mandibles (fig.7c) elongate.................. Rhynchocyrtus

Fig.7.
 


Endnotes

1 The key to the subgenera of Lepidocyrtus s.l. is based on Yoshii's studies of species mainly from the Oriental and Australian regions. Not all species from these regions have been described well enough to be sure of their position, and the classification may not hold up in other parts of the world. Some at least of the characters used appear to represent cases of convergence.


Differential diagnoses

Acanthurella
Dental spines present (fig.3). Head with 8 + 8 eyes.

Acrocyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix pointed (fig.5b). Dental basal appendix present (fig.5). Dental spines absent. Head with 8 + 8 eyes. Ventral tube scales absent.

Carocyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix pointed (fig.5b). Dental basal appendix present (fig.5). Dental spines absent. Head with 8 + 8 eyes. Ventral tube scaled on posterior face only. Ventral tube scales present.

Cinctocyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix rounded (fig.5a). Dental basal appendix present (fig.5). Dental spines absent. First antennal segment and femur not scaled. Head with 8 + 8 eyes. Mouthparts not projecting. Mucronal basal spine simple.

Dahlcyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix rounded (fig.5a). Dental basal appendix present (fig.5). Dental spines absent. First antennal segment and femur scaled. Head with 8 + 8 eyes. Mucronal basal spine simple.

Lanocyrtus
Antennae and legs not scaled. Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental basal appendix absent. Dental spines absent. Head with 8 + 8 eyes.

Lepidocyrtus
Antennae and legs scaled. Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental basal appendix absent. Dental spines absent. Head with 8 + 8 eyes.

Metasinella
Antennae more than 1.4 times as long as head and body combined. Head with 6 + 6 or fewer eyes. Mucronal lamella projecting from end of dens (fig.1a).

Onerocyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix pointed (fig.5b). Dental basal appendix present (fig.5). Dental spines absent. Head with 8 + 8 eyes. Ventral tube scaled on both faces. Ventral tube scales present.

Pseudosinella
Fourth antennal segment not greatly swollen. Head with 6 + 6 or fewer eyes. Mucro bidentate (fig.1c). Mucronal lamella absent.

Rambutsinella
Fourth antennal segment greatly swollen (fig.2). Head with 6 + 6 or fewer eyes. Mucro bidentate (fig.1c). Mucronal lamella absent.

Rhynchocyrtus
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix rounded (fig.5a). Dental basal appendix present (fig.5). Dental spines absent. First antennal segment and femur not scaled. Head with 8 + 8 eyes. Mouthparts projecting, labrum (fig.7a), labium (fig.7b) and mandibles (fig.7c) elongate. Mucronal basal spine simple.

Setogaster
Body scales all rounded or truncate (fig.4c&d). Body scales striated finely. Dental appendix rounded (fig.5a). Dental basal appendix present (fig.5). Dental spines absent. Head with 8 + 8 eyes. Mucronal basal spine with spinelet (fig.6).

Sinelloides
Head with 6 + 6 or fewer eyes. Mucro falcate. Mucronal lamella absent.

Sulcuncus
Antennae less than .5 times as long as head and body combined. Head with 6 + 6 or fewer eyes. Mucronal lamella projecting from end of dens (fig.1a).

Vietsira
Body scales some apically pointed (fig.4a&b). Body scales striated heavily. Dental spines absent. Head with 8 + 8 eyes.


References