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

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.

Mikhail Potapov, Moscow State Pedagogical University, Moscow, 129164, Russia
Anatoly Babenko, Institute of Ecology and Evolution RAN, Moscow, 119071, Russia
Arne Fjellberg, Zoological Museum, Lund University, S-223 62, Lund, Sweden
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). Fifth abdominal segment with 8 short spines set on low papillae
        (fig.154)................................................ octa
      Fifth abdominal segment without spines........................ 2
 
2(1). Macrochaetae on fifth abdominal segment clearly thickened
        (fig.161); ventral tube with 6 + 6 laterodistal and about 10
        posterior chaetae............................... echinodermata
      Macrochaetae on fifth abdominal segment not thickened (fig.174);
        ventral tube with less than 6 + 6 laterodistal and lees than
        10 posterior chaetae........................................ 3
 
3(2). Ventral tube with 3 + 3 laterodistal chaetae.................. 4
      Ventral tube with 4 + 4 laterodistal chaetae...... magnomucrella
 
4(3). Ocelli 6 + 6; dens with 1-2 anterior chaetae; manubrium with 2 +
        2 chaetae on anterior surface......................... beckeri
      Ocelli 8 + 8; dens with 5 anterior chaetae; manubrium with 1 + 1
        anterior chaetae.................................. janetscheki

Differential diagnoses

beckeri
Dens with 1–2 anterior chaetae. Fifth abdominal segment without spines. Macrochaetae on fifth abdominal segment not thickened (fig.). Manubrium with 2 + 2 chaetae on anterior surface. Ocelli 6 + 6. Ventral tube with less than 6 + 6 laterodistal and lees than 10 posterior chaetae. Ventral tube with 3 + 3 laterodistal chaetae.

echinodermata
Fifth abdominal segment without spines. Macrochaetae on fifth abdominal segment clearly thickened (fig.). Ventral tube with 6 + 6 laterodistal and about 10 posterior chaetae.

janetscheki
Dens with 5 anterior chaetae. Fifth abdominal segment without spines. Macrochaetae on fifth abdominal segment not thickened (fig.). Manubrium with 1 + 1 anterior chaetae. Ocelli 8 + 8. Ventral tube with less than 6 + 6 laterodistal and lees than 10 posterior chaetae. Ventral tube with 3 + 3 laterodistal chaetae.

magnomucrella
Fifth abdominal segment without spines. Macrochaetae on fifth abdominal segment not thickened (fig.). Ventral tube with less than 6 + 6 laterodistal and lees than 10 posterior chaetae. Ventral tube with 4 + 4 laterodistal chaetae.

octa
Fifth abdominal segment with 8 short spines set on low papillae (fig.).


References