http://www.collembola.org/key/anuridaj.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Anurida partim without eyes

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).   Postantennal organ moruliform............................... 2
        Postantennal organ not moruliform.......................... 14
 
2(1).   Macrochaeta and microchaeta differentiated.................. 3
        Macrochaeta and microchaeta not differentiated............. 13
 
3(2).   Mandible with fewer than 10 teeth........................... 4
        Mandible with more than 10 teeth........................... 12
 
4(3).   Unguis with internal tooth.................................. 5
        Unguis without internal tooth.............................. 11
 
5(4).   Postantennal organ with fewer than 45 vesicles.............. 6
        Postantennal organ with more than 45 vesicles.............. 10
 
6(5).   Postantennal organ with fewer than 20 vesicles.... mandibulata
        Postantennal organ with more than 20 vesicles............... 7
 
7(6).   Postantennal organ with 38-40 vesicles................ vicaria
        Postantennal organ with fewer than 38 vesicles.............. 8
 
8(7).   Maxilla with 2 + 1 lamellae............................ setosa
        Maxilla with 3 + 1 lamellae................................. 9
 
9(8).   Fourth antennal segment with 20 sensilla............. okamotoi
        Fourth antennal segment with 5-9 sensilla............. speobia 1
 
10(5).  Fourth antennal segment with 12 sensilla; postantennal organ
          with 48 vesicles............................ plurichaetotica
        Fourth antennal segment with 7 sensilla; postantennal organ
          with 60 vesicles...................................... iriei
 
11(4).  Fourth antennal segment with 7 sensilla; thorax with
          paratergites........................................ frigida
        Fourth antennal segment with 9-10 sensilla; thorax without
          paratergites........................................ desnuda
 
12(3).  Postantennal organ with 45 vesicles; sixth abdominal segment
          not bilobed....................................... assimilis
        Postantennal organ with 60 vesicles; sixth abdominal segment
          bilobed....................................... stereoodorata
 
13(2).  Postantennal organ with 12-14 vesicles........... wrangelensis
        Postantennal organ with 25-37 vesicles................ speobia
 
14(1).  Mandible with 10-15 teeth........................... diabolica
        Mandible with fewer than 10 teeth.......................... 15
 
15(14). Mandible with 6 teeth...................................... 16
        Mandible with fewer than 6 teeth........................... 22
 
16(15). Macrocheatae and microchaetae differentiated............... 17
        Macrocheatae and microchaetae not differentiated........... 20
 
17(16). Maxilla with 2 + 1 lamellae...................... caprariensis
        Maxilla with 3 + 1 lamellae................................ 18
 
18(17). Thorax and abdomen with paratergites............ thalassophila
        Thorax only with paratergites.............................. 19
 
19(18). Fourth antennal segment with 6 sensilla.............. granaria
        Fourth antennal segment with 7 sensilla............... frigida 1
 
20(16). Postantennal organ with 10 or more vesicles................ 21
        Postantennal organ with 7-9 vesicles.................. bonneti
 
21(20). Fourth antennal segment with 6 sensilla; maxilla with 2 + 1
          lamellae.......................................... callainii
        Fourth antennal segment with 7 sensilla; maxilla with 3 + 1
          lamellae............................................ polaris
 
22(15). Thorax with paratergites................................... 23
        Thorax without paratergites................................ 27
 
23(22). Maxilla with 2 + 1 lamellae...................... wrangelensis 1
        Maxilla with 3 + 1 lamellae................................ 24
 
24(23). Postantennal organ with 7-8 vesicles................... ariesi
        Postantennal organ with more than 10 vesicles.............. 25
 
25(24). Furca absent........................................ sakhensis
        Furca reduced to 2 mamelons................................ 26
 
26(25). Macrochaetae and microchaetae differentiated............. komi
        Macrochaetae and microchaetae not differentiated...... lvivska
 
27(22). Fourth antennal segment with 5 sensilla.................... 28
        Fourth antennal segment with more than 5 sensilla.......... 38
 
28(27). Mandible with 3-4 teeth.................................... 29
        Mandible with 5 or more teeth.............................. 30
 
29(28). Macrochaetae and microchaetae differenciated....... annatshagi
        Macrochaetae and microchaetae not differenciated..............
           ............................................ latosensillata
 
30(28). Mandible with 4 teeth...................................... 31
        Mandible with 5 or more teeth.............................. 33
 
31(30). Postantennal organ with 12-16 vesicles..................... 32
        Postantennal organ with 19-21 vesicles................ tamurae
 
32(31). Fourth antennal segment with 6 sensilla............ martynovae
        Fourth antennal segment with more than 5 sensilla... uniformis
 
33(30). Postantennal organ with 9 vesicles.................. balatovae
        Postantennal organ with more than 9 vesicles............... 34
 
34(33). Unguis with internal tooth............................ reducta
        Unguis without internal tooth.............................. 35
 
35(34). Maxilla with 2 + 1 lamellae.......................... kazukoae
        Maxilla with 3 + 1 lamellae................................ 36
 
36(35). Postantennal organ with asymmetric vesicles........ subarctica 1
        Postantennal organ with symmetric vesicles................. 37
 
37(36). Vesicles of postantennal organ narrow or compressed... similis
        Vesicles of postantennal organ not compressed.................
           ................................................ martynovae 1
 
38(27). Postantennal organ with 9 vesicles.................. nadezhdae
        Postantennal organ with more than 9 vesicles............... 39
 
39(38). Postantennal organ with 11-17 vesicles............. subarctica
        Postantennal organ with 20-25 vesicles................... nuda

Endnotes

1 Duplicates due to infraspecific variability.


Differential diagnoses

annatshagi
Fourth antennal segment with 5 sensilla. Macrochaetae and microchaetae differenciated. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 3–4 teeth. Postantennal organ not moruliform. Thorax without paratergites.

ariesi
Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with 7–8 vesicles. Thorax with paratergites.

assimilis
Macrochaeta and microchaeta differentiated. Mandible with more than 10 teeth. Postantennal organ moruliform. Postantennal organ with 45 vesicles. Sixth abdominal segment not bilobed.

balatovae
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Postantennal organ not moruliform. Postantennal organ with 9 vesicles. Thorax without paratergites.

bonneti
Macrocheatae and microchaetae not differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Postantennal organ not moruliform. Postantennal organ with 7–9 vesicles.

callainii
Fourth antennal segment with 6 sensilla. Macrocheatae and microchaetae not differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 2 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with 10 or more vesicles.

caprariensis
Macrocheatae and microchaetae differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 2 + 1 lamellae. Postantennal organ not moruliform.

desnuda
Fourth antennal segment with 9–10 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Thorax without paratergites. Unguis without internal tooth.

diabolica
Mandible with 10–15 teeth. Postantennal organ not moruliform.

frigida
Fourth antennal segment with 7 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Thorax with paratergites. Unguis without internal tooth.

frigida 1
Fourth antennal segment with 7 sensilla. Macrocheatae and microchaetae differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Thorax only with paratergites.

granaria
Fourth antennal segment with 6 sensilla. Macrocheatae and microchaetae differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Thorax only with paratergites.

iriei
Fourth antennal segment with 7 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Postantennal organ with more than 45 vesicles. Postantennal organ with 60 vesicles. Unguis with internal tooth.

kazukoae
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Maxilla with 2 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Thorax without paratergites. Unguis without internal tooth.

komi
Furca reduced to 2 mamelons. Macrochaetae and microchaetae differentiated. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 10 vesicles. Thorax with paratergites.

latosensillata
Fourth antennal segment with 5 sensilla. Macrochaetae and microchaetae not differenciated. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 3–4 teeth. Postantennal organ not moruliform. Thorax without paratergites.

lvivska
Furca reduced to 2 mamelons. Macrochaetae and microchaetae not differentiated. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 10 vesicles. Thorax with paratergites.

mandibulata
Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Postantennal organ with fewer than 20 vesicles. Postantennal organ with fewer than 45 vesicles. Unguis with internal tooth.

martynovae
Fourth antennal segment with 5 sensilla. Fourth antennal segment with 6 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 4 teeth. Postantennal organ not moruliform. Postantennal organ with 12–16 vesicles. Thorax without paratergites.

martynovae 1
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Postantennal organ with symmetric vesicles. Thorax without paratergites. Unguis without internal tooth. Vesicles of postantennal organ not compressed.

nadezhdae
Fourth antennal segment with more than 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Postantennal organ not moruliform. Postantennal organ with 9 vesicles. Thorax without paratergites.

nuda
Fourth antennal segment with more than 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Postantennal organ with 20–25 vesicles. Thorax without paratergites.

okamotoi
Fourth antennal segment with 20 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ moruliform. Postantennal organ with more than 20 vesicles. Postantennal organ with fewer than 38 vesicles. Postantennal organ with fewer than 45 vesicles. Unguis with internal tooth.

plurichaetotica
Fourth antennal segment with 12 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Postantennal organ with more than 45 vesicles. Postantennal organ with 48 vesicles. Unguis with internal tooth.

polaris
Fourth antennal segment with 7 sensilla. Macrocheatae and microchaetae not differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with 10 or more vesicles.

reducta
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Thorax without paratergites. Unguis with internal tooth.

sakhensis
Furca absent. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 10 vesicles. Thorax with paratergites.

setosa
Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Maxilla with 2 + 1 lamellae. Postantennal organ moruliform. Postantennal organ with more than 20 vesicles. Postantennal organ with fewer than 38 vesicles. Postantennal organ with fewer than 45 vesicles. Unguis with internal tooth.

similis
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Postantennal organ with symmetric vesicles. Thorax without paratergites. Unguis without internal tooth. Vesicles of postantennal organ narrow or compressed.

speobia
Macrochaeta and microchaeta not differentiated. Postantennal organ moruliform. Postantennal organ with 25–37 vesicles.

speobia 1
Fourth antennal segment with 5–9 sensilla. Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ moruliform. Postantennal organ with more than 20 vesicles. Postantennal organ with fewer than 38 vesicles. Postantennal organ with fewer than 45 vesicles. Unguis with internal tooth.

stereoodorata
Macrochaeta and microchaeta differentiated. Mandible with more than 10 teeth. Postantennal organ moruliform. Postantennal organ with 60 vesicles. Sixth abdominal segment bilobed.

subarctica
Fourth antennal segment with more than 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Postantennal organ with 11–17 vesicles. Thorax without paratergites.

subarctica 1
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 5 or more teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Postantennal organ with more than 9 vesicles. Postantennal organ with asymmetric vesicles. Thorax without paratergites. Unguis without internal tooth.

tamurae
Fourth antennal segment with 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 4 teeth. Postantennal organ not moruliform. Postantennal organ with 19–21 vesicles. Thorax without paratergites.

thalassophila
Macrocheatae and microchaetae differentiated. Mandible with fewer than 10 teeth. Mandible with 6 teeth. Maxilla with 3 + 1 lamellae. Postantennal organ not moruliform. Thorax and abdomen with paratergites.

uniformis
Fourth antennal segment with 5 sensilla. Fourth antennal segment with more than 5 sensilla. Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Mandible with 5 or more teeth. Mandible with 4 teeth. Postantennal organ not moruliform. Postantennal organ with 12–16 vesicles. Thorax without paratergites.

vicaria
Macrochaeta and microchaeta differentiated. Mandible with fewer than 10 teeth. Postantennal organ moruliform. Postantennal organ with more than 20 vesicles. Postantennal organ with 38–40 vesicles. Postantennal organ with fewer than 45 vesicles. Unguis with internal tooth.

wrangelensis
Macrochaeta and microchaeta not differentiated. Postantennal organ moruliform. Postantennal organ with 12–14 vesicles.

wrangelensis 1
Mandible with fewer than 10 teeth. Mandible with fewer than 6 teeth. Maxilla with 2 + 1 lamellae. Postantennal organ not moruliform. Thorax with paratergites.


References