http://www.collembola.org/key/lepidocy.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the subgenera of Lepidocyrtus

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.

Fang Wang, Department of Biology, Nanjing University, Nanjing 210093, China
Jian-Xiu Chen, Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
Kenneth A. Christiansen, Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
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). Dental basal lobe absent...................................... 2
      Dental basal lobe present (fig.1)............................. 3
 

Fig.1.
 
2(1). Antennae not scaled; legs not scaled................. Lanocyrtus
      Antennae scaled; legs scaled....................... Lepidocyrtus
 
3(1). Dental basal lobe with 3 spinelike tubercles (fig.2). Allocyrtus
      Dental basal lobe with one tubercle........................... 4
 

Fig.2.
 
4(3). Dental basal tubercle pointed (fig.3a)........................ 5
      Dental basal tubercle rounded (fig.3b)........................ 7
 

Fig.3.
 
5(4). Ventral tube scales absent........................... Acrocyrtus
      Ventral tube scales present................................... 6
 
6(5). Ventral tube scaled on both anterior and posterior face.........
         ................................................. Onerocyrtus
      Ventral tube scaled on posterior face only........... Carocyrtus
 
7(4). Mucronal basal spine with spinelet (fig.4)........... Setogaster
      Mucronal basal spine without spinelet......................... 8
 

Fig.4.
 
8(7). Femur not scaled; first antennal segment not scaled.............
         ................................................ Cinctocyrtus
      Femur scaled; first antennal segment scaled................... 9
 
9(8). Character to be defined  ............................ Dahlcyrtus
      Character to be defined  ............................ Ascocyrtus


Endnotes

1 At present, the subgenera Dahlcyrtus and Ascocyrtus cannot be differentiated. The species that Yosii (1959) originally placed in the subgenus Cinctocyrtus (which he renamed Ascocyrtus (Yosii 1963) and did not later remove to the subgenus Dahlcyrtus) are placed in the subgenus Ascocyrtus (Wang, Chen & Christiansen, 2003:825).


Differential diagnoses

Acrocyrtus
Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle pointed (fig.3a). Ventral tube scales absent.

Allocyrtus
Dental basal lobe present (fig.1). Dental basal lobe with 3 spinelike tubercles (fig.2).

Ascocyrtus
Character to be defined . Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle rounded (fig.3b). Femur scaled. First antennal segment scaled. Mucronal basal spine without spinelet.

Carocyrtus
Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle pointed (fig.3a). Ventral tube scaled on posterior face only. Ventral tube scales present.

Cinctocyrtus
Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle rounded (fig.3b). Femur not scaled. First antennal segment not scaled. Mucronal basal spine without spinelet.

Dahlcyrtus
Character to be defined . Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle rounded (fig.3b). Femur scaled. First antennal segment scaled. Mucronal basal spine without spinelet.

Lanocyrtus
Antennae not scaled. Dental basal lobe absent. Legs not scaled.

Lepidocyrtus
Antennae scaled. Dental basal lobe absent. Legs scaled.

Onerocyrtus
Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle pointed (fig.3a). Ventral tube scaled on both anterior and posterior face. Ventral tube scales present.

Setogaster
Dental basal lobe present (fig.1). Dental basal lobe with one tubercle. Dental basal tubercle rounded (fig.3b). Mucronal basal spine with spinelet (fig.4).


References