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

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.

Marcela Ospina, Laboratorio de Artrópodos de suelo, Centro Internacional de Agricultura Tropical (CIAT), Km 17 recta Cali-Palmira, Colombia
José G. Palacios-Vargas, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
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).   Second antennal segment and third antennal segment highly
          modified into a clasping organ (fig.1b)................... 2
        Second antennal segment and third antennal segment not
          modified (fig.1a)......................................... 7
 

Fig.1.
 
2(1).   Eyes 6 + 6.................................................. 3
        Eyes 8 + 8............................................. ramosa 1
 
3(2).   Third unguis with one inner tooth........................... 4
        Third unguis without inner tooth.................... serroseta 1
 
4(3).   Third tibiotarsus with 3 serrate setae............. lithophila 1
        Third tibiotarsus with 4 serrate setae...................... 5
 
5(4).   First tibiotarsus with four large bladder-like organs (fig.2).
           ................................................ colombiana 1
        First tibiotarsus with four small bladder-like organs....... 6
 

Fig.2.
 
6(5).   Head with special nasal organ, formed by a basal insertion and
          four ciliated setae in the same alveolus (fig.3)............
           ................................................. diomedesi 1
        Head without special nasal organ..................... maesorum 1
 

Fig.3.
 
7(1).   First tibiotarsus with one serrate seta..................... 8
        First tibiotarsus without serrate setae.................... 11
 
8(7).   Second tibiotarsus with one serrate seta.................... 9
        Second tibiotarsus without serrate setae................... 10
 
9(8).   Anal valves with 1 + 1 serrate setae................... ramosa 2
        Anal valves with 3 + 3 serrate setae............... sexpinnata 2
 
10(8).  Lateral anal valves with 2 + 2 serrate setae (fig.4)..........
           ................................................ colombiana 2
        Lateral anal valves without serrate setae............. seurati 2
 

Fig.4.
 
11(7).  Third unguis with an inner tooth........................... 12
        Third unguis without inner tooth..................... nayarita 2
 
12(11). Third tibiotarsus with 3 serrate setae..................... 13
        Third tibiotarsus with 4 serrate setae............... maesorum 2
 
13(12). Unguiculus with filament shorter than unguis........ serroseta 2
        Unguiculus with long filament surpassing the unguis...........
           ................................................ lithophila 2


Endnotes

1 Male.

2 Female.

3 Male of nayarita, sexpinnata and seurati unknown.

4 Female of diomedesi unknown.


Differential diagnoses

colombiana 1
Eyes 6 + 6. First tibiotarsus with four large bladder-like organs (fig.2). Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b). Third tibiotarsus with 4 serrate setae. Third unguis with one inner tooth.

colombiana 2
First tibiotarsus with one serrate seta. Lateral anal valves with 2 + 2 serrate setae (fig.4). Second antennal segment and third antennal segment not modified (fig.1a). Second tibiotarsus without serrate setae.

diomedesi 1
Eyes 6 + 6. First tibiotarsus with four small bladder-like organs. Head with special nasal organ, formed by a basal insertion and four ciliated setae in the same alveolus (fig.3). Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b). Third tibiotarsus with 4 serrate setae. Third unguis with one inner tooth.

lithophila 1
Eyes 6 + 6. Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b). Third tibiotarsus with 3 serrate setae. Third unguis with one inner tooth.

lithophila 2
First tibiotarsus without serrate setae. Second antennal segment and third antennal segment not modified (fig.1a). Third tibiotarsus with 3 serrate setae. Third unguis with an inner tooth. Unguiculus with long filament surpassing the unguis.

maesorum 1
Eyes 6 + 6. First tibiotarsus with four small bladder-like organs. Head without special nasal organ. Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b). Third tibiotarsus with 4 serrate setae. Third unguis with one inner tooth.

maesorum 2
First tibiotarsus without serrate setae. Second antennal segment and third antennal segment not modified (fig.1a). Third tibiotarsus with 4 serrate setae. Third unguis with an inner tooth.

nayarita 2
First tibiotarsus without serrate setae. Second antennal segment and third antennal segment not modified (fig.1a). Third unguis without inner tooth.

ramosa 1
Eyes 8 + 8. Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b).

ramosa 2
Anal valves with 1 + 1 serrate setae. First tibiotarsus with one serrate seta. Second antennal segment and third antennal segment not modified (fig.1a). Second tibiotarsus with one serrate seta.

serroseta 1
Eyes 6 + 6. Second antennal segment and third antennal segment highly modified into a clasping organ (fig.1b). Third unguis without inner tooth.

serroseta 2
First tibiotarsus without serrate setae. Second antennal segment and third antennal segment not modified (fig.1a). Third tibiotarsus with 3 serrate setae. Third unguis with an inner tooth. Unguiculus with filament shorter than unguis.

seurati 2
First tibiotarsus with one serrate seta. Lateral anal valves without serrate setae. Second antennal segment and third antennal segment not modified (fig.1a). Second tibiotarsus without serrate setae.

sexpinnata 2
Anal valves with 3 + 3 serrate setae. First tibiotarsus with one serrate seta. Second antennal segment and third antennal segment not modified (fig.1a). Second tibiotarsus with one serrate seta.


References