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

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.

**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.