http://www.collembola.org/key/willinae.htm - Last updated on 2017.03.31 by Frans Janssens
Checklist of the Collembola: Key to the genera of Willowsiinae

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.

Feng Zhang, Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
Anne Bedos, Muséum National d'Histoire Naturelle, UMR7205 CNRS, Paris, France
Louis Deharveng, Muséum National d'Histoire Naturelle, UMR7205 CNRS, Paris, France
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).   Scales with long ribs....................................... 2
        Scales with short striations............................... 10
 
2(1).   Dental scales absent........................................ 3
        Dental scales present.............................. Lepidodens
 
3(2).   Eyes absent................................................. 4
        Eyes present................................................ 6
 
4(3).   Mucro bidentate................................. Szeptyckiella
        Mucro falcate............................................... 5
 
5(4).   Macrochaetotaxy strongly reduced................ Lepidosinella
        Macrochaetotaxy well developed...................... Hawinella
 
6(3).   Mucro bidentate............................................. 7
        Mucro falcate............................................... 9
 
7(6).   Scales chaeta-like, narrow; scales finely sculpted with all
          ribs short; scales in posterior row of tergites elongate and
          narrower..................................... Janetschekbrya
        Scales not chaeta-like; scales variously sculpted; scales in
          posterior row of tergites not much longer................. 8
 
8(7).   Scales narrow; scales with two uninterrupted lateral ribs.....
           ............................................... Americabrya
        Scales not narrow; scales with various types of sculpture,
          from very short spinules to long ribs............. Willowsia
 
9(6).   Mucronal basal spine absent.......................... Desertia
        Mucronal basal spine present...................... Drepanosira
 
10(1).  Scales apically pointed.................................... 11
        Scales apically rounded.................................... 12
 
11(10). Sixth abdominal segment with finger like projection (fig.1)..
           ................................................ Epimetrura
        Sixth abdominal segment without finger like projection........
           ................................................ Lepidobrya
 

Fig.1.
 
12(10). Manubrium with distal thick blunt macrochaetae (fig.2).......
           ........................................... Lepidocyrtoides
        Manubrium without distal thick blunt macrochaetae.. Lepidosira

Fig.2.
 


Differential diagnoses

Americabrya
Dental scales absent. Eyes present. Mucro bidentate. Scales not chaeta-like. Scales variously sculpted. Scales narrow. Scales in posterior row of tergites not much longer. Scales with long ribs. Scales with two uninterrupted lateral ribs.

Desertia
Dental scales absent. Eyes present. Mucro falcate. Mucronal basal spine absent. Scales with long ribs.

Drepanosira
Dental scales absent. Eyes present. Mucro falcate. Mucronal basal spine present. Scales with long ribs.

Epimetrura
Scales apically pointed. Scales with short striations. Sixth abdominal segment with finger like projection (fig.1).

Hawinella
Dental scales absent. Eyes absent. Macrochaetotaxy well developed. Mucro falcate. Scales with long ribs.

Janetschekbrya
Dental scales absent. Eyes present. Mucro bidentate. Scales chaeta-like, narrow. Scales finely sculpted with all ribs short. Scales in posterior row of tergites elongate and narrower. Scales with long ribs.

Lepidobrya
Scales apically pointed. Scales with short striations. Sixth abdominal segment without finger like projection.

Lepidocyrtoides
Manubrium with distal thick blunt macrochaetae (fig.2). Scales apically rounded. Scales with short striations.

Lepidodens
Dental scales present. Scales with long ribs.

Lepidosinella
Dental scales absent. Eyes absent. Macrochaetotaxy strongly reduced. Mucro falcate. Scales with long ribs.

Lepidosira
Manubrium without distal thick blunt macrochaetae. Scales apically rounded. Scales with short striations.

Szeptyckiella
Dental scales absent. Eyes absent. Mucro bidentate. Scales with long ribs.

Willowsia
Dental scales absent. Eyes present. Mucro bidentate. Scales not chaeta-like. Scales variously sculpted. Scales not narrow. Scales in posterior row of tergites not much longer. Scales with long ribs. Scales with various types of sculpture, from very short spinules to long ribs.


References