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

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.

Rafael Jordana, Department of Zoology and Ecology, University of Navarra, 31080, Pamplona, Navarra, Spain
Enrique Baquero, Department of Zoology and Ecology, University of Navarra, 31080, Pamplona, Navarra, Spain
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).   Ocelli 7 + 7................................................ 2
        Ocelli at most 6 + 6........................................ 3
 
2(1).   Mucro absent........................................... oculea
        Mucro present....................................... vandalica
 
3(1).   Ocelli 6 + 6................................................ 4
        Ocelli at most 5 + 5....................................... 12
 
4(3).   Dens with 3-4 chaetae....................................... 5
        Dens with more than 4 chaetae............................... 7
 
5(4).   Tenaculum with 3 teeth............................. deharvengi
        Tenaculum with 4 teeth...................................... 6
 
6(5).   Fourth antennal segment with 6 sensilla. duodecimoculata 1
        Fourth antennal segment with 7 sensilla................ cheoha
 
7(4).   Second to third abdominal segment with 3-4 a-chaetae........ 8
        Second to third abdominal segment with 5 a-chaetae......... 11
 
8(7).   Second to third abdominal segment with 3 a-chaetae............
           .......................................... duodecimocellata
        Second to third abdominal segment with 4 a-chaetae.......... 9
 
9(8).   Fourth abdominal segment with 3 m-chaetae; tenaculum with 3
          teeth............................................. vandalica 3
        Fourth abdominal segment with fewer than 3 m-chaetae;
          tenaculum with 4 teeth................................... 10
 
10(9).  Fourth abdominal segment with 1 m-chaeta................ jarae
        Fourth abdominal segment with 2 m-chaetae............. elegans
 
11(7).  Second to third abdominal segment with 2 m-chaetae............
           ................................................. vandalica 4
        Second to third abdominal segment with 3 m-chaetae............
           .......................................... duodecimocellata 2
 
12(3).  Ocelli 5 + 5............................................... 13
        Ocelli at most 4 + 4....................................... 19
 
13(12). Unguis with inner tooth.................................... 14
        Unguis without inner tooth.......................... bidentata
 
14(13). Dens with 3-4 chaetae...................................... 15
        Dens with more than 3-4 chaetae............................ 16
 
15(14). Second abdominal segment with 2 m-chaetae........ canigouensis
        Second abdominal segment with 3 m-chaetae........ decemoculata
 
16(14). Postantennal organ with 4 lobes............................ 17
        Postantennal organ with 5 lobes................... raulmugnizi
 
17(16). Second to third abdominal segment with 3 a-chaetae......... 18
        Second to third abdominal segment with 4 a-chaetae............
           ............................................ quinqueoculata
 
18(17). Fourth abdominal segment with 2 m-chaetae.............. maxima
        Fourth abdominal segment with 3 m-chaetae............ czernovi
 
19(12). Ocelli 4 + 4............................................... 20
        Ocelli at most 3 + 3....................................... 22
 
20(19). Dens with 3-4 chaetae................................. willemi
        Dens with more than 4 chaetae.............................. 21
 
21(20). Fourth abdominal segment with 1 m-chaeta : m4; postantennal
          organ with 4 multi-branched lobes............... baschkirica
        Fourth abdominal segment with 4 m-chaetae; postantennal organ
          with 4 simple lobes.......................... fukugakuchiana
 
22(19). Ocelli 3 + 3............................................... 23
        Ocelli at most 2 + 2....................................... 28
 
23(22). Postantennal organ with 6-8 lobes................. scossirolii
        Postantennal organ with fewer than 6 lobes................. 24
 
24(23). Mucro reduced or absent.................................... 25
        Mucro well developed....................................... 27
 
25(24). Mucro absent; second to third abdominal segment with 5 or 6
          chaetae in rows "a" and "m" together..................... 26
        Mucro reduced; second to third abdominal segment with 4
          chaetae in rows "a" and "m" together............. pouadensis
 
26(25). Dens with 3 chaetae; second to third abdominal segment with 5
          chaetae in rows "a" and "m" together.............. lindbergi
        Dens with 4 chaetae; second to third abdominal segment with 6
          chaetae in rows "a" and "m" together............. emucronata
 
27(24). Dens with 4 chaetae................................ sexoculata
        Dens with 5 chaetae.................................. hubbardi
 
28(22). Ocelli 2 + 2............................................... 29
        Ocelli at most 1 + 1....................................... 31
 
29(28). Fourth antennal segment with 6 sensilla; mucro present........
           ............................................... kitakamiana
        Fourth antennal segment with 7-9 sensilla; mucro absent.... 30
 
30(29). Dens with 3 chaetae; second to third abdominal segment with 5
          chaetae in rows "a" and "m" together............... ariegica
        Dens with 4 chaetae; second to third abdominal segment with 3
          chaetae in rows "a" and "m" together.......... quadrioculata
 
31(28). Fourth antennal segment with 8 or more sensilla............ 32
        Fourth antennal segment with fewer than 8 sensilla......... 33
 
32(31). Mucro reduced; second to third abdominal segment with 5
          chaetae in rows "a" and "m" together.................. coeca
        Mucro well developed; second to third abdominal segment with 7
          chaetae in rows "a" and "m" together............... oaxacana
 
33(31). Mucro absent; ocelli absent................................ 34
        Mucro well developed; ocelli 1 + 1 or absent.... profundissima
 
34(33). Fourth abdominal segment with 6 chaetae in rows "a" and "m"
          together; dens with 3 chaetae...................... subcoeca
        Fourth abdominal segment with 8 chaetae in rows "a" and "m"
          together; dens with 4-5 chaetae................ guerrerensis

Endnotes

1 sensu Thibaud et al., 2004.

2 sensu Fjellberg, 1984.

3 Specimens with less than 7+7 ocelli, sensu Babenko nec Jordana & Arbea, 1990.

4 Specimens with less than 7+7 ocelli, sensu Jordana & Arbea, 1990.


Differential diagnoses

ariegica
Dens with 3 chaetae. Fourth antennal segment with 7–9 sensilla. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli 2 + 2. Ocelli at most 5 + 5. Second to third abdominal segment with 5 chaetae in rows "a" and "m" together.

baschkirica
Dens with more than 4 chaetae. Fourth abdominal segment with 1 m-chaeta : m4. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli 4 + 4. Ocelli at most 5 + 5. Postantennal organ with 4 multi-branched lobes.

bidentata
Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Unguis without inner tooth.

canigouensis
Dens with 3–4 chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Second abdominal segment with 2 m-chaetae. Unguis with inner tooth.

cheoha
Dens with 3–4 chaetae. Fourth antennal segment with 7 sensilla. Ocelli at most 6 + 6. Ocelli 6 + 6. Tenaculum with 4 teeth.

coeca
Fourth antennal segment with 8 or more sensilla. Mucro reduced. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli at most 1 + 1. Ocelli at most 5 + 5. Second to third abdominal segment with 5 chaetae in rows "a" and "m" together.

czernovi
Dens with more than 3–4 chaetae. Fourth abdominal segment with 3 m-chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Postantennal organ with 4 lobes. Second to third abdominal segment with 3 a-chaetae. Unguis with inner tooth.

decemoculata
Dens with 3–4 chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Second abdominal segment with 3 m-chaetae. Unguis with inner tooth.

deharvengi
Dens with 3–4 chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Tenaculum with 3 teeth.

duodecimocellata
Dens with more than 4 chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 3–4 a-chaetae. Second to third abdominal segment with 3 a-chaetae.

duodecimocellata 2
Dens with more than 4 chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 5 a-chaetae. Second to third abdominal segment with 3 m-chaetae.

duodecimoculata 1
Dens with 3–4 chaetae. Fourth antennal segment with 6 sensilla. Ocelli at most 6 + 6. Ocelli 6 + 6. Tenaculum with 4 teeth.

elegans
Dens with more than 4 chaetae. Fourth abdominal segment with fewer than 3 m-chaetae. Fourth abdominal segment with 2 m-chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 3–4 a-chaetae. Second to third abdominal segment with 4 a-chaetae. Tenaculum with 4 teeth.

emucronata
Dens with 4 chaetae. Mucro reduced or absent. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with fewer than 6 lobes. Second to third abdominal segment with 5 or 6 chaetae in rows "a" and "m" together. Second to third abdominal segment with 6 chaetae in rows "a" and "m" together.

fukugakuchiana
Dens with more than 4 chaetae. Fourth abdominal segment with 4 m-chaetae. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli 4 + 4. Ocelli at most 5 + 5. Postantennal organ with 4 simple lobes.

guerrerensis
Dens with 4–5 chaetae. Fourth abdominal segment with 8 chaetae in rows "a" and "m" together. Fourth antennal segment with fewer than 8 sensilla. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli at most 1 + 1. Ocelli at most 5 + 5. Ocelli absent.

hubbardi
Dens with 5 chaetae. Mucro well developed. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with fewer than 6 lobes.

jarae
Dens with more than 4 chaetae. Fourth abdominal segment with fewer than 3 m-chaetae. Fourth abdominal segment with 1 m-chaeta. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 3–4 a-chaetae. Second to third abdominal segment with 4 a-chaetae. Tenaculum with 4 teeth.

kitakamiana
Fourth antennal segment with 6 sensilla. Mucro present. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli 2 + 2. Ocelli at most 5 + 5.

lindbergi
Dens with 3 chaetae. Mucro reduced or absent. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with fewer than 6 lobes. Second to third abdominal segment with 5 or 6 chaetae in rows "a" and "m" together. Second to third abdominal segment with 5 chaetae in rows "a" and "m" together.

maxima
Dens with more than 3–4 chaetae. Fourth abdominal segment with 2 m-chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Postantennal organ with 4 lobes. Second to third abdominal segment with 3 a-chaetae. Unguis with inner tooth.

oaxacana
Fourth antennal segment with 8 or more sensilla. Mucro well developed. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli at most 1 + 1. Ocelli at most 5 + 5. Second to third abdominal segment with 7 chaetae in rows "a" and "m" together.

oculea
Mucro absent. Ocelli 7 + 7.

pouadensis
Mucro reduced or absent. Mucro reduced. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with fewer than 6 lobes. Second to third abdominal segment with 4 chaetae in rows "a" and "m" together.

profundissima
Fourth antennal segment with fewer than 8 sensilla. Mucro well developed. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli at most 1 + 1. Ocelli at most 5 + 5. Ocelli 1 + 1 or absent.

quadrioculata
Dens with 4 chaetae. Fourth antennal segment with 7–9 sensilla. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli 2 + 2. Ocelli at most 5 + 5. Second to third abdominal segment with 3 chaetae in rows "a" and "m" together.

quinqueoculata
Dens with more than 3–4 chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Postantennal organ with 4 lobes. Second to third abdominal segment with 4 a-chaetae. Unguis with inner tooth.

raulmugnizi
Dens with more than 3–4 chaetae. Ocelli at most 6 + 6. Ocelli 5 + 5. Ocelli at most 5 + 5. Postantennal organ with 5 lobes. Unguis with inner tooth.

scossirolii
Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with 6–8 lobes.

sexoculata
Dens with 4 chaetae. Mucro well developed. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli 3 + 3. Ocelli at most 5 + 5. Postantennal organ with fewer than 6 lobes.

subcoeca
Dens with 3 chaetae. Fourth abdominal segment with 6 chaetae in rows "a" and "m" together. Fourth antennal segment with fewer than 8 sensilla. Mucro absent. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli at most 3 + 3. Ocelli at most 2 + 2. Ocelli at most 1 + 1. Ocelli at most 5 + 5. Ocelli absent.

vandalica
Mucro present. Ocelli 7 + 7.

vandalica 3
Dens with more than 4 chaetae. Fourth abdominal segment with 3 m-chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 3–4 a-chaetae. Second to third abdominal segment with 4 a-chaetae. Tenaculum with 3 teeth.

vandalica 4
Dens with more than 4 chaetae. Ocelli at most 6 + 6. Ocelli 6 + 6. Second to third abdominal segment with 5 a-chaetae. Second to third abdominal segment with 2 m-chaetae.

willemi
Dens with 3–4 chaetae. Ocelli at most 6 + 6. Ocelli at most 4 + 4. Ocelli 4 + 4. Ocelli at most 5 + 5.


References