http://www.collembola.org/key/isotodes.htm - Last updated on 2006.11.08 by Frans Janssens
Checklist of the Collembola: Key to the species of Isotomodes, partim Ibero-balearic

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.

Javier I. Arbea, Departamento de Ciencias Naturales, IES Alhama, Avda. del Villar, 44, E-31591 Corella, España
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 a pair of dorsomedial macrosetae.
           ......................................................... 2
        Fifth abdominal segment without dorsomedial macrosetae...... 9

2(1).   Dens with 1 anterior seta........................... productus
        Dens with 2 or more anterior setae.......................... 3

3(2).   Dens with 2 anterior setae.................................. 4
        Dens with 3 or more anterior setae.......................... 5
        "Tenacular ridges" half as long as dens; ventral tube with 4 +

4(3).   "Tenacular ridges" almost as long as dens; ventral tube with 3
          + 3 lateral setae................................... armatus
          4 lateral setae.................................. subarmatus

5(3).   Dens with 3 anterior setae............................. martae
        Dens with at least 4 anterior setae......................... 6

6(5).   Dens with 4 anterior setae.......................... alavensis
        Dens with at least 5 anterior setae......................... 7

7(6).   Dens with 6 anterior setae......................... trisetosus
        Dens with 5 anterior setae.................................. 8

8(7).   Fourth abdominal segment with seta p12; setae p1 and p3 on
          sixth abdominal segment not spine-like.............. rafaeli
        Fourth abdominal segment without seta p12; setae p1 and p3 on
          sixth abdominal segment spine-like................ sotoensis

9(1).   Dens with 2 anterior setae................................. 10
        Dens with 3 or more anterior setae......................... 13

10(9).  Fifth abdominal segment with 5 + 5 microsetae and 1 + 1
          sensilla on dorsal side........................... gredensis
        Fifth abdominal segment with 4 + 4 microsetae and 1 + 1
          sensilla on dorsal side.................................. 11

11(10). Ventral tube with 4 + 4 lateral setae............... bisetosus
        Ventral tube with 3 + 3 lateral setae...................... 12

12(11). Setae p1, p3, p4 on sixth abdominal segment not spine-like....
           ..................................................... rosae
        Setae p1, p3, p4 on sixth abdominal segment spine-like........
           ................................................... ibanezi

13(9).  Dens with 4 anterior setae...................... quadrisetosus
        Dens with 6 anterior setae......................... sexsetosus

References