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

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.

Wolfram Dunger, Staatliches Museum für Naturkunde Görlitz, Görlitz, DDR
Jelena Zivadinovic, Poljprivredni fakultet Univerziteta, Sarajevo, Yugoslavia
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

Preamble

Note that this identification key is a simplified and partial key, intended to key out the Folsomia species of the region of Bosnia and Hercegovina (Yugoslavia).

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).   Eyes 0 + 0, 1 + 1 or 2 + 2; pigment absent or present....... 2
        Eyes 5 + 5 or 6 + 6; pigment present....................... 14
 
2(1).   Eyes absent and pigment absent.............................. 3
        Eyes present - 2 + 2 or 1 + 1, difficult to observe! and
          pigment mostly present or seldom absent................... 8
 
3(2).   Manubrium ventrally with 2 setae.................... gebhardti
        Manubrium ventrally with 4 or more setae.................... 4
 
4(3).   Manubrium ventrally with 4 setae............................ 5
        Manubrium ventrally with 8 to 32 setae...................... 6
 
5(4).   Dens ventrally with 21 setae....................... sensibilis
        Dens ventrally with 8 to 12 setae................... inoculata
 
6(4).   Manubrium ventrally with 16 to 32 setae............... candida
        Manubrium ventrally with 8 to 12 setae...................... 7
 
7(6).   Dens ventrally with 12 to 14 setae.................... spinosa
        Dens ventrally with 18 to 21 setae.................. fimetaria
 
8(2).   Manubrium ventrally with 2 setae............................ 9
        Manubrium ventrally with 5 or more setae................... 12
 
9(8).   Dens ventrally with 4 or 5 setae.................. bogojevicae
        Dens ventrally with 7 or 8 setae........................... 10
 
10(9).  Eyes 1 + 1 and pigment absent................... diplophthalma
        Eyes 2 + 2 and pigment mostly distinctly present or seldom
          absent................................................... 11
 
11(10). Sensillum accp at thorax ii in front of p-series..............
           ............................................. quadrioculata
        Sensillum accp at thorax ii in p-series............ manolachei
 
12(8).  Manubrium ventrally with 12 to 17 setae.............. penicula
        Manubrium ventrally with 5 to 8 setae...................... 13
 
13(12). Eyes 1 + 1; manubrium ventrally with 8 setae.......... similis
        Eyes 2 + 2; manubrium ventrally with 6 setae...... microchaeta
 
14(1).  Frontally grouped eyes 3 + 3, followed by 2 + 2 eyes....... 15
        Frontally grouped eyes 4 + 4, followed by 1 + 1 or 2 + 2 eyes.
           .................................................... alpina
 
15(14). Dens ventrally with 11 setae..................... decemoculata
        Dens ventrally with 27 setae......................... decopsis

Differential diagnoses

alpina
Eyes 5 + 5 or 6 + 6. Frontally grouped eyes 4 + 4, followed by 1 + 1 or 2 + 2 eyes. Pigment present.

bogojevicae
Dens ventrally with 4 or 5 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Manubrium ventrally with 2 setae. Pigment absent or present.

candida
Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 4 or more setae. Manubrium ventrally with 8 to 32 setae. Manubrium ventrally with 16 to 32 setae. Pigment absent or present.

decemoculata
Dens ventrally with 11 setae. Eyes 5 + 5 or 6 + 6. Frontally grouped eyes 3 + 3, followed by 2 + 2 eyes. Pigment present.

decopsis
Dens ventrally with 27 setae. Eyes 5 + 5 or 6 + 6. Frontally grouped eyes 3 + 3, followed by 2 + 2 eyes. Pigment present.

diplophthalma
Dens ventrally with 7 or 8 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Eyes 1 + 1 and pigment absent. Manubrium ventrally with 2 setae. Pigment absent or present.

fimetaria
Dens ventrally with 18 to 21 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 4 or more setae. Manubrium ventrally with 8 to 32 setae. Manubrium ventrally with 8 to 12 setae. Pigment absent or present.

gebhardti
Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 2 setae. Pigment absent or present.

inoculata
Dens ventrally with 8 to 12 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 4 or more setae. Manubrium ventrally with 4 setae. Pigment absent or present.

manolachei
Dens ventrally with 7 or 8 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Eyes 2 + 2 and pigment mostly distinctly present or seldom absent. Manubrium ventrally with 2 setae. Pigment absent or present. Sensillum accp at thorax ii in p-series.

microchaeta
Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Eyes 2 + 2. Manubrium ventrally with 5 or more setae. Manubrium ventrally with 5 to 8 setae. Manubrium ventrally with 6 setae. Pigment absent or present.

penicula
Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Manubrium ventrally with 5 or more setae. Manubrium ventrally with 12 to 17 setae. Pigment absent or present.

quadrioculata
Dens ventrally with 7 or 8 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Eyes 2 + 2 and pigment mostly distinctly present or seldom absent. Manubrium ventrally with 2 setae. Pigment absent or present. Sensillum accp at thorax ii in front of p-series.

sensibilis
Dens ventrally with 21 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 4 or more setae. Manubrium ventrally with 4 setae. Pigment absent or present.

similis
Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes present - 2 + 2 or 1 + 1, difficult to observe! and pigment mostly present or seldom absent. Eyes 1 + 1. Manubrium ventrally with 5 or more setae. Manubrium ventrally with 5 to 8 setae. Manubrium ventrally with 8 setae. Pigment absent or present.

spinosa
Dens ventrally with 12 to 14 setae. Eyes 0 + 0, 1 + 1 or 2 + 2. Eyes absent and pigment absent. Manubrium ventrally with 4 or more setae. Manubrium ventrally with 8 to 32 setae. Manubrium ventrally with 8 to 12 setae. Pigment absent or present.


References