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

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.

Igor J. Kaprus', State Museum of Natural History, Ukrainian National Academy of Sciences, Teatral'na St.18, UA-79008 L'viv, Ukraine
Wanda M. Weiner, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, Pl-31016 Kraków, Poland
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).   Third antennal segment sense organ with sense clubs of other
          structure................................................. 2
        Third antennal segment sense organ with strongly papillate
          sense clubs............................................ gela
 
2(1).   Third thoracic tergum not with 3 + 3 pseudocelli............ 3
        Third thoracic tergum with 3 + 3 pseudocelli................ 5
 
3(2).   First thoracic tergum with 0 + 0 pseudocelli; second thoracic
          tergum with 2 + 2 pseudocelli; third thoracic tergum with 2
          + 2 pseudocelli, pseudocellar formula dorsally:
          32/022/22243....................................... melittae
        First thoracic tergum with 1 pseudocelli; second thoracic
          tergum with 4 + 4 pseudocelli; third thoracic tergum with 4
          + 4 pseudocelli........................................... 4
 
4(3).   Pseudocellar formula dorsally: 3, 3/0, 4........... kurtshevae
        Pseudocellar formula dorsally: 4, 3/1, 4, 4/5, 4, 4, 5, 3.....
           ................................................... montana
 
5(2).   First thoracic tergum with 0 + 0 pseudocelli................ 6
        First thoracic tergum with 1 + 1 pseudocelli............... 10
 
6(5).   First to third abdominal terga with 3 + 3 pseudocelli each.. 7
        First to third abdominal terga with 4 + 4 pseudocelli each,
          pseudocellar formula dorsally: 32/033/44454............... 9
 
7(6).   Fourth abdominal tergum with 3 + 3 pseudocelli; third antennal
          segment sense organ with four guard chaetae. tottabetsuensis
        Fourth abdominal tergum with 4 + 4 pseudocelli; third antennal
          segment sense organ with five guard chaetae............... 8
 
8(7).   Postantennal organ as long as 2.0 nearest pseudocellus........
           ................................................. pingicola
        Postantennal organ as long as 3.5 nearest pseudocellus........
           ................................................... koreana
 
9(6).   Empodial appendage with distinct basal lamella; thoracic
          sterna ii and iii with 1 + 1 chaetae each........... reversa
        Empodial appendage without distinct basal lamella; thoracic
          sterna ii and iii without chaetae...................... nuda
 
10(5).  Fourth abdominal tergum with 5 + 5 pseudocelli............. 11
        Fourth abdominal tergum with less then 5 + 5 pseudocelli... 14
 
11(10). Third thoracic tergum with microsensilla................... 12
        Third thoracic tergum without microsensilla.......... sabulosa
 
12(11). Pseudocellar formula dorsally: 3, 2/1, 3, 3/3, 3, 3, 5, 3;
          macrochaetae strongly developed; thoracic sterna ii and iii
          with chaetae.................................... aborigensis
        Pseudocellar formula dorsally: 3, 2/1, 3, 3/3, 3, 3, 5, 4 (5);
          macrochaetae poorly differentiated; thoracic sterna ii and
          iii without chaetae...................................... 13
 
13(12). Head with one pseudocellus situated on antennal base and two
          others outside; parapseudocellar formula 0/000/122201;
          antennal segment ii with 12-13 chaetae............. judithae
        Head with two pseudocelli situated on antennal base and one
          outside; parapseudocellar formula 0/000/121201; antennal
          segment ii with 15 chaetae......................... linderae
 
14(10). Fourth abdominal tergum with 3 + 3 pseudocelli, pseudocellar
          formula dorsally: 32/133/33333..................... palissai
        Fourth abdominal tergum with 4 + 4 pseudocelli, pseudocellar
          formula dorsally: 32/133/33343........................... 15
 
15(14). Third thoracic tergum with microsensilla................... 16
        Third thoracic tergum without microsensilla................ 17
 
16(15). Fifth abdominal tergum with m1 chaetae longer than a1 and p1;
          labial type AC; antennal segment i in adults with 9 chaetae;
          claws with small lateral teeth................. groenlandica
        Fifth abdominal tergum with m1 chaetae shorter than a1 and p1;
          labial type A; antennal segment i in adults with 8 chaetae;
          claws without lateral teeth........................ schoetti
 
17(15). Labial type A; third antennal segment sense organ with
          granulated sense clubs; ventral tube with 8 + 8 chaetae.....
           ...................................................... ursi
        Labial type AB; third antennal segment sense organ with ribbed
          sense clubs; ventral tube with 6 + 6 chaetae....... tuvinica

Differential diagnoses

aborigensis
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with 5 + 5 pseudocelli. Macrochaetae strongly developed. Pseudocellar formula dorsally: 3, 2/1, 3, 3/3, 3, 3, 5, 3. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with microsensilla. Thoracic sterna ii and iii with chaetae.

gela
Third antennal segment sense organ with strongly papillate sense clubs.

groenlandica
Antennal segment i in adults with 9 chaetae. Claws with small lateral teeth. Fifth abdominal tergum with m1 chaetae longer than a1 and p1. First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with less then 5 + 5 pseudocelli. Fourth abdominal tergum with 4 + 4 pseudocelli, pseudocellar formula dorsally: 32/133/33343. Labial type AC. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with microsensilla.

judithae
Antennal segment ii with 12–13 chaetae. First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with 5 + 5 pseudocelli. Head with one pseudocellus situated on antennal base and two others outside. Macrochaetae poorly differentiated. Parapseudocellar formula 0/000/122201. Pseudocellar formula dorsally: 3, 2/1, 3, 3/3, 3, 3, 5, 4 (5). Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with microsensilla. Thoracic sterna ii and iii without chaetae.

koreana
First thoracic tergum with 0 + 0 pseudocelli. First to third abdominal terga with 3 + 3 pseudocelli each. Fourth abdominal tergum with 4 + 4 pseudocelli. Postantennal organ as long as 3.5 nearest pseudocellus. Third antennal segment sense organ with sense clubs of other structure. Third antennal segment sense organ with five guard chaetae. Third thoracic tergum with 3 + 3 pseudocelli.

kurtshevae
First thoracic tergum with 1 pseudocelli. Pseudocellar formula dorsally: 3, 3/0, 4. Second thoracic tergum with 4 + 4 pseudocelli. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum not with 3 + 3 pseudocelli. Third thoracic tergum with 4 + 4 pseudocelli.

linderae
Antennal segment ii with 15 chaetae. First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with 5 + 5 pseudocelli. Head with two pseudocelli situated on antennal base and one outside. Macrochaetae poorly differentiated. Parapseudocellar formula 0/000/121201. Pseudocellar formula dorsally: 3, 2/1, 3, 3/3, 3, 3, 5, 4 (5). Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with microsensilla. Thoracic sterna ii and iii without chaetae.

melittae
First thoracic tergum with 0 + 0 pseudocelli. Second thoracic tergum with 2 + 2 pseudocelli. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum not with 3 + 3 pseudocelli. Third thoracic tergum with 2 + 2 pseudocelli, pseudocellar formula dorsally: 32/022/22243.

montana
First thoracic tergum with 1 pseudocelli. Pseudocellar formula dorsally: 4, 3/1, 4, 4/5, 4, 4, 5, 3. Second thoracic tergum with 4 + 4 pseudocelli. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum not with 3 + 3 pseudocelli. Third thoracic tergum with 4 + 4 pseudocelli.

nuda
Empodial appendage without distinct basal lamella. First thoracic tergum with 0 + 0 pseudocelli. First to third abdominal terga with 4 + 4 pseudocelli each, pseudocellar formula dorsally: 32/033/44454. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Thoracic sterna ii and iii without chaetae.

palissai
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with less then 5 + 5 pseudocelli. Fourth abdominal tergum with 3 + 3 pseudocelli, pseudocellar formula dorsally: 32/133/33333. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli.

pingicola
First thoracic tergum with 0 + 0 pseudocelli. First to third abdominal terga with 3 + 3 pseudocelli each. Fourth abdominal tergum with 4 + 4 pseudocelli. Postantennal organ as long as 2.0 nearest pseudocellus. Third antennal segment sense organ with sense clubs of other structure. Third antennal segment sense organ with five guard chaetae. Third thoracic tergum with 3 + 3 pseudocelli.

reversa
Empodial appendage with distinct basal lamella. First thoracic tergum with 0 + 0 pseudocelli. First to third abdominal terga with 4 + 4 pseudocelli each, pseudocellar formula dorsally: 32/033/44454. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Thoracic sterna ii and iii with 1 + 1 chaetae each.

sabulosa
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with 5 + 5 pseudocelli. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum without microsensilla.

schoetti
Antennal segment i in adults with 8 chaetae. Claws without lateral teeth. Fifth abdominal tergum with m1 chaetae shorter than a1 and p1. First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with less then 5 + 5 pseudocelli. Fourth abdominal tergum with 4 + 4 pseudocelli, pseudocellar formula dorsally: 32/133/33343. Labial type A. Third antennal segment sense organ with sense clubs of other structure. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum with microsensilla.

tottabetsuensis
First thoracic tergum with 0 + 0 pseudocelli. First to third abdominal terga with 3 + 3 pseudocelli each. Fourth abdominal tergum with 3 + 3 pseudocelli. Third antennal segment sense organ with sense clubs of other structure. Third antennal segment sense organ with four guard chaetae. Third thoracic tergum with 3 + 3 pseudocelli.

tuvinica
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with less then 5 + 5 pseudocelli. Fourth abdominal tergum with 4 + 4 pseudocelli, pseudocellar formula dorsally: 32/133/33343. Labial type AB. Third antennal segment sense organ with sense clubs of other structure. Third antennal segment sense organ with ribbed sense clubs. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum without microsensilla. Ventral tube with 6 + 6 chaetae.

ursi
First thoracic tergum with 1 + 1 pseudocelli. Fourth abdominal tergum with less then 5 + 5 pseudocelli. Fourth abdominal tergum with 4 + 4 pseudocelli, pseudocellar formula dorsally: 32/133/33343. Labial type A. Third antennal segment sense organ with sense clubs of other structure. Third antennal segment sense organ with granulated sense clubs. Third thoracic tergum with 3 + 3 pseudocelli. Third thoracic tergum without microsensilla. Ventral tube with 8 + 8 chaetae.


References