http://www.collembola.org/key/cremaini.htm - Last updated on 2017.09.30 by Frans Janssens
Checklist of the Collembola: Key to the genera of Cremastocephalini

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.

Saral K. Mitra, Zoological Survey of India, Calcutta, West Bengal, India
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). Vertex medially only with 1 + 1 V1 macrochaetae, inserted in a
        straight line.......................................... Yosiia
      Vertex with more than 1 + 1 macrochaetae...................... 2
 
2(1). Ocular setae 3; vertex with 2 + 2 macrochaetae, inserted in a
        trapezoid fashion........................................... 3
      Ocular setae at least 3; vertex at least with 6 + 6
        macrochaetae, inserted in a rectangle or in the form of a V. 4
 
3(2). Ocular seta oc2 always represented by macrochaeta........ Salina
      Ocular seta oc2 represented by microchaeta (fig.1).... Akabosia
 

Fig.1.
 
4(2). Ocular setae more than 3; ocular seta oc2 always microchaeta, as
        well as other ocular setae.................................. 5
      Ocular setae not more than 3; ocular seta oc2 always
        macrochaeta...................................... Pseudosalina
 
5(4). Ocular setae 4................................................ 6
      Ocular setae 5......................................... Paronana
 
6(5). Cephalic dorsal macrosetae represented by D0 + D1-D9 (fig.2b)..
         ................................................ Paronellides
      Cephalic dorsal setae represented by D1-D3 (fig.2a)............
         ................................................. Metacoelura

Fig.2.
 


Endnotes

1 Glacialoca is not included in the key.


Differential diagnoses

Akabosia
Ocular seta oc2 represented by microchaeta (fig.1). Ocular setae 3. Vertex with more than 1 + 1 macrochaetae. Vertex with 2 + 2 macrochaetae, inserted in a trapezoid fashion.

Metacoelura
Cephalic dorsal setae represented by D1-D3 (fig.2a). Ocular seta oc2 always microchaeta, as well as other ocular setae. Ocular setae 4. Ocular setae at least 3. Ocular setae more than 3. Vertex with more than 1 + 1 macrochaetae. Vertex at least with 6 + 6 macrochaetae, inserted in a rectangle or in the form of a V.

Paronana
Ocular seta oc2 always microchaeta, as well as other ocular setae. Ocular setae 5. Ocular setae at least 3. Ocular setae more than 3. Vertex with more than 1 + 1 macrochaetae. Vertex at least with 6 + 6 macrochaetae, inserted in a rectangle or in the form of a V.

Paronellides
Cephalic dorsal macrosetae represented by D0 + D1-D9 (fig.2b). Ocular seta oc2 always microchaeta, as well as other ocular setae. Ocular setae 4. Ocular setae at least 3. Ocular setae more than 3. Vertex with more than 1 + 1 macrochaetae. Vertex at least with 6 + 6 macrochaetae, inserted in a rectangle or in the form of a V.

Pseudosalina
Ocular seta oc2 always macrochaeta. Ocular setae at least 3. Ocular setae not more than 3. Vertex with more than 1 + 1 macrochaetae. Vertex at least with 6 + 6 macrochaetae, inserted in a rectangle or in the form of a V.

Salina
Ocular seta oc2 always represented by macrochaeta. Ocular setae 3. Vertex with more than 1 + 1 macrochaetae. Vertex with 2 + 2 macrochaetae, inserted in a trapezoid fashion.

Yosiia
Vertex medially only with 1 + 1 V1 macrochaetae, inserted in a straight line.


References