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

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.

Gerhard Bretfeld, Raiffeisenstr. 7B, 24242 Felde, Germany
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). Head and anterior of large abdomen with only minute setae..... 2
      Head and anterior of large abdomen with setae or spines of
        normal setal length or longer............................... 3
 
2(1). Large abdomen of globular form; neosminthuroid setae present....
         ................................................. Calvatomina
      Large abdomen posteriorly with prominent protuberance with few
        pairs of short spines; neosminthuroid setae absent............
         ........................................... Pseudodicyrtomina
 
3(1). Dens with mostly clearly ciliate setae; retinaculum with 3 + 3
        teeth............................................ Gibberathrix
      Dens without ciliate setae; retinaculum with 4 + 4 teeth...... 4
 
4(3). Dorsal head-back with 1-2 or 1-3 long spines........ Dicyrtomina
      Dorsal head-back with 1 pair of slender spines, and 2 pairs of
        short or minute spines...................................... 5
 
5(4). Claws with tunica; sixth abdominal segment dorsally with only
        normal seta...................................... Jordanathrix
      Claws without tunica; sixth abdominal segment dorsally often
        with thick spines................................... Dicyrtoma

Differential diagnoses

Calvatomina
Head and anterior of large abdomen with only minute setae. Large abdomen of globular form. Neosminthuroid setae present.

Dicyrtoma
Claws without tunica. Dens without ciliate setae. Dorsal head-back with 1 pair of slender spines, and 2 pairs of short or minute spines. Head and anterior of large abdomen with setae or spines of normal setal length or longer. Retinaculum with 4 + 4 teeth. Sixth abdominal segment dorsally often with thick spines.

Dicyrtomina
Dens without ciliate setae. Dorsal head-back with 1–2 or 1–3 long spines. Head and anterior of large abdomen with setae or spines of normal setal length or longer. Retinaculum with 4 + 4 teeth.

Gibberathrix
Dens with mostly clearly ciliate setae. Head and anterior of large abdomen with setae or spines of normal setal length or longer. Retinaculum with 3 + 3 teeth.

Jordanathrix
Claws with tunica. Dens without ciliate setae. Dorsal head-back with 1 pair of slender spines, and 2 pairs of short or minute spines. Head and anterior of large abdomen with setae or spines of normal setal length or longer. Retinaculum with 4 + 4 teeth. Sixth abdominal segment dorsally with only normal seta.

Pseudodicyrtomina
Head and anterior of large abdomen with only minute setae. Large abdomen posteriorly with prominent protuberance with few pairs of short spines. Neosminthuroid setae absent.


References