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

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.

Feng Zhang, Department of Biology, Nanjing University, Nanjing 210093, China
Louis Deharveng, UMR 7205 CNRS, Origine, Structure et Evolution de la Biodiversité, Museum National d'Histoire Naturelle, Paris, France
Jian-Xiu Chen, Department of Biology, Nanjing University, Nanjing 210093, China
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).   Eyes 2 + 2...................................... tetrophthalma
        Eyes at most 1 + 1.......................................... 2
 
2(1).   Eyes 1 + 1.................................................. 3
        Eyes absent................................................. 5
 
3(2).   Fourth abdominal segment with 6 + 6 central macrochaetae.... 4
        Fourth abdominal segment with 7 + 7 central macrochaetae......
           ............................................. indonesiensis
 
4(3).   First abdominal segment with 4 + 4 central macrochaetae.......
           ................................................... tukmeas
        First abdominal segment with 6 + 6 central macrochaetae.......
           .................................................... boneti
 
5(2).   Mucronal basal spine long reaching at least near apex of
          apical tooth.............................................. 6
        Mucronal basal spine very short, not reaching the apex of
          apical tooth.......................................... caeca
 
6(5).   Unguis with at most one unpaired inner distal teeth......... 7
        Unguis with two unpaired inner distal teeth................ 31
 
7(6).   Manubrium with dorsal smooth chaetae........................ 8
        Manubrium without dorsal smooth chaetae.................... 26
 
8(7).   Unguis with unpaired inner distal tooth..................... 9
        Unguis without unpaired inner distal tooth................. 25
 
9(8).   Outer tooth on unguiculus at most slightly broader than
          unguiculus itself........................................ 10
        Outer tooth on unguiculus twice as broad as unguiculus itself.
           ................................................... papuana
 
10(9).  Antennae less than three times as long as the cephalic
          diagonal................................................. 11
        Antennae more than five times as long as the cephalic
          diagonal............................................... nupa
 
11(10). Tibiotarsus with rows of "smooth" inner differentiated
          chaetae, i.e. with ciliations closely appressed to axis.. 12
        Tibiotarsus without rows of "smooth" inner differentiated
          chaetae.................................................. 16
 
12(11). Fourth abdominal segment with 4 + 4 central macrochaetae... 13
        Fourth abdominal segment with more than 4 + 4 central
          macrochaetae............................................. 14
 
13(12). Third abdominal segment with 2 + 2 lateral macrochaetae.......
           ............................................... tenebricosa
        Third abdominal segment with 3 + 3 lateral macrochaetae.......
           ............................................. tibiotarsalis
 
14(12). Third abdominal segment with 1 + 1 central macrochaetae.......
           .................................................... hoefti
        Third abdominal segment with 2 + 2 central macrochaetae.... 15
 
15(14). Second thoracic segment with three medio-median and two
          medio-lateral macrochaetae.......................... magyari
        Second thoracic segment with two medio-median and three
          medio-lateral macrochaetae............................ lanna
 
16(11). Unguis elongate, with unpaired inner distal tooth basal, at
          less than 20% from the base of the claw......... akiyoshiana
        Unguis with unpaired inner distal tooth at more than 25% from
          the base of the claw..................................... 17
 
17(16). Second abdominal segment with 4 + 4 central macrochaetae......
           ..................................................... kukae
        Second abdominal segment with at most 3 + 3 central
          macrochaetae............................................. 18
 
18(17). Second abdominal segment with 2 + 2 central macrochaetae......
           ................................................... similis
        Second abdominal segment with 3 + 3 central macrochaetae... 19
 
19(18). First abdominal segment with 4 + 4 central macrochaetae.... 20
        First abdominal segment with 5 + 5 central macrochaetae.... 21
 
20(19). Fourth abdominal segment with 6 or 7 + 6 or 7 central
          macrochaetae.......................................... aokii
        Fourth abdominal segment with less than 4 + 4 central
          macrochaetae............................................ lua
 
21(19). Unguis with inner paired teeth at less than 25% from the base
          of the claw.................................... spinidentata
        Unguis with inner paired teeth at more than 35% from the base
          of the claw.............................................. 22
 
22(21). Fourth abdominal segment with 5 + 5 central macrochaetae......
           ................................................... dubiosa
        Fourth abdominal segment with at most 4 + 4 central
          macrochaetae............................................. 23
 
23(22). Fourth abdominal segment with 3 + 3 central macrochaetae......
           ................................................. oligoseta
        Fourth abdominal segment with 4 + 4 central macrochaetae... 24
 
24(23). Second thoracic segment with p4 and p4i macrochaeta... borerae
        Second thoracic segment with p4 microchaeta and p4i absent....
           ................................................ guanophila
 
25(8).  Dental smooth part about 0.7 times as long as mucro. ishikawai
        Dental smooth part about 1.5 times as long as mucro.. maritima
 
26(7).  Third abdominal segment with 1 + 1 central macrochaetae.... 27
        Third abdominal segment with 2 + 2 central macrochaetae.... 29
 
27(26). Fourth abdominal segment with 7 + 7 central macrochaetae......
           .................................................. communis
        Fourth abdominal segment with less than 6 + 6 central
          macrochaetae............................................. 28
 
28(27). Fourth abdominal segment with 3 + 3 central macrochaetae......
           .............................................. edenticulata
        Fourth abdominal segment with 5 + 5 central macrochaetae......
           ................................................ tropicalis
 
29(26). Fourth abdominal segment with 5 + 5 central macrochaetae......
           .................................................... huangi
        Fourth abdominal segment with at least 7 + 7 central
          macrochaetae............................................. 30
 
30(29). Fourth abdominal segment with 7 + 7 central macrochaetae. liui
        Fourth abdominal segment with at least 8 + 8 central
          macrochaetae..................................... tibetensis
 
31(6).  Tenent hairs clavate............................... submontana
        Tenent hairs pointed.................................. montana


Endnotes

1 The species arcuata is not included because of inadequate information.


Differential diagnoses

akiyoshiana
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis elongate, with unpaired inner distal tooth basal, at less than 20% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

aokii
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 4 + 4 central macrochaetae. Fourth abdominal segment with 6 or 7 + 6 or 7 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

boneti
Eyes at most 1 + 1. Eyes 1 + 1. First abdominal segment with 6 + 6 central macrochaetae. Fourth abdominal segment with 6 + 6 central macrochaetae.

borerae
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 5 + 5 central macrochaetae. Fourth abdominal segment with at most 4 + 4 central macrochaetae. Fourth abdominal segment with 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Second thoracic segment with p4 and p4i macrochaeta. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth. Unguis with inner paired teeth at more than 35% from the base of the claw.

caeca
Eyes at most 1 + 1. Eyes absent. Mucronal basal spine very short, not reaching the apex of apical tooth.

communis
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with 7 + 7 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 1 + 1 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

dubiosa
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 5 + 5 central macrochaetae. Fourth abdominal segment with 5 + 5 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth. Unguis with inner paired teeth at more than 35% from the base of the claw.

edenticulata
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with less than 6 + 6 central macrochaetae. Fourth abdominal segment with 3 + 3 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 1 + 1 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

guanophila
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 5 + 5 central macrochaetae. Fourth abdominal segment with at most 4 + 4 central macrochaetae. Fourth abdominal segment with 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Second thoracic segment with p4 microchaeta and p4i absent. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth. Unguis with inner paired teeth at more than 35% from the base of the claw.

hoefti
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with more than 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Third abdominal segment with 1 + 1 central macrochaetae. Tibiotarsus with rows of "smooth" inner differentiated chaetae, i.e. with ciliations closely appressed to axis. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

huangi
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with 5 + 5 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 2 + 2 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

indonesiensis
Eyes at most 1 + 1. Eyes 1 + 1. Fourth abdominal segment with 7 + 7 central macrochaetae.

ishikawai
Dental smooth part about 0.7 times as long as mucro. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Unguis without unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

kukae
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with 4 + 4 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

lanna
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with more than 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second thoracic segment with two medio-median and three medio-lateral macrochaetae. Third abdominal segment with 2 + 2 central macrochaetae. Tibiotarsus with rows of "smooth" inner differentiated chaetae, i.e. with ciliations closely appressed to axis. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

liui
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with at least 7 + 7 central macrochaetae. Fourth abdominal segment with 7 + 7 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 2 + 2 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

lua
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 4 + 4 central macrochaetae. Fourth abdominal segment with less than 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

magyari
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with more than 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second thoracic segment with three medio-median and two medio-lateral macrochaetae. Third abdominal segment with 2 + 2 central macrochaetae. Tibiotarsus with rows of "smooth" inner differentiated chaetae, i.e. with ciliations closely appressed to axis. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

maritima
Dental smooth part about 1.5 times as long as mucro. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Unguis without unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

montana
Eyes at most 1 + 1. Eyes absent. Mucronal basal spine long reaching at least near apex of apical tooth. Tenent hairs pointed. Unguis with two unpaired inner distal teeth.

nupa
Antennae more than five times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

oligoseta
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 5 + 5 central macrochaetae. Fourth abdominal segment with at most 4 + 4 central macrochaetae. Fourth abdominal segment with 3 + 3 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth. Unguis with inner paired teeth at more than 35% from the base of the claw.

papuana
Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus twice as broad as unguiculus itself. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

similis
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 2 + 2 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

spinidentata
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. First abdominal segment with 5 + 5 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Second abdominal segment with at most 3 + 3 central macrochaetae. Second abdominal segment with 3 + 3 central macrochaetae. Tibiotarsus without rows of "smooth" inner differentiated chaetae. Unguis with unpaired inner distal tooth at more than 25% from the base of the claw. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth. Unguis with inner paired teeth at less than 25% from the base of the claw.

submontana
Eyes at most 1 + 1. Eyes absent. Mucronal basal spine long reaching at least near apex of apical tooth. Tenent hairs clavate. Unguis with two unpaired inner distal teeth.

tenebricosa
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Third abdominal segment with 2 + 2 lateral macrochaetae. Tibiotarsus with rows of "smooth" inner differentiated chaetae, i.e. with ciliations closely appressed to axis. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

tetrophthalma
Eyes 2 + 2.

tibetensis
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with at least 7 + 7 central macrochaetae. Fourth abdominal segment with at least 8 + 8 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 2 + 2 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

tibiotarsalis
Antennae less than three times as long as the cephalic diagonal. Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with 4 + 4 central macrochaetae. Manubrium with dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Outer tooth on unguiculus at most slightly broader than unguiculus itself. Third abdominal segment with 3 + 3 lateral macrochaetae. Tibiotarsus with rows of "smooth" inner differentiated chaetae, i.e. with ciliations closely appressed to axis. Unguis with unpaired inner distal tooth. Unguis with at most one unpaired inner distal teeth.

tropicalis
Eyes at most 1 + 1. Eyes absent. Fourth abdominal segment with less than 6 + 6 central macrochaetae. Fourth abdominal segment with 5 + 5 central macrochaetae. Manubrium without dorsal smooth chaetae. Mucronal basal spine long reaching at least near apex of apical tooth. Third abdominal segment with 1 + 1 central macrochaetae. Unguis with at most one unpaired inner distal teeth.

tukmeas
Eyes at most 1 + 1. Eyes 1 + 1. First abdominal segment with 4 + 4 central macrochaetae. Fourth abdominal segment with 6 + 6 central macrochaetae.


References