| Checklist of the Collembola: Key to the species of Scutisotoma |
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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.
Mikhail Potapov,
Moscow State Pedagogical University, Moscow, 129164, Russia
Anatoly Babenko,
Institute of Ecology and Evolution RAN, Moscow, 119071, Russia
Arne Fjellberg,
Zoological Museum, Lund University, S-223 62, Lund, Sweden
Frans Janssens,
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
1(0). Maxillary outer lobe with a simple palp..................... 2
Maxillary outer lobe with bifurcate palp.................... 6
2(1). Third thoracic segment with ventral chaetae................. 3
Third thoracic segment without ventral chaetae.............. 4
3(2). Mucro with 2 teeth................................. fjellbergi
Mucro with 3 teeth..................................... oirota
4(2). Labial papilla e with 6 guards, e7 absent; prelabral chaetae
3......................................................... 5
Labial papilla e with 7 guards; prelabral chaetae 4...........
............................................. christianseni
5(4). Dens with 1 anterior and 3-4 posterior chaetae (fig.140);
ventral tube with 4 + 4 laterodistal chaetae...... indigirka
Dens with 6-7 anterior and 8 posterior chaetae; ventral tube
with 3 + 3 laterodistal chaetae.................. subarctica
6(1). Manubrium with 1 + 1, rarely 2 + 2, anterior chaetae........ 7
Manubrium without anterior chaetae (figs. 122-123, 128).... 22
7(6). Number of sensilla on second thoracic segment to fifth
abdominal segment as 33/22224 (figs. 6, 46)............... 8
Number of sensilla on second thoracic segment to fifth
abdominal segment more than 33/22224..................... 21
8(7). Dens with 1 anterior and 2-3 posterior chaetae (figs. 114,
115).......................................... dodecocellata
Dens with more than 1 anterior and 2-3 posterior chaetae.... 9
9(8). Third antennal segment with one laterodistal sensillum
(fig.101)................................................ 10
Third antennal segment with two laterodistal sensilla
(fig.70)................................................. 18
10(9). Dens with fewer than 13 anterior and 13 posterior chaetae;
furca short.............................................. 11
Dens with more than 25 anterior and 20 posterior chaetae
(figs. 36, 37); furca long............................... 16
11(10). Dens with 10-13 anterior chaetae; mucro with 3 teeth, proximal
tooth almost as strong as apical and subapical ones
(fig.89)................................................. 12
Dens with 6-8 anterior chaetae; mucro with 2 teeth (fig.111),
or a third minute proximal tooth may be present
(figs.105-107)........................................... 13
12(11). Dens with 10-13 posterior chaetae : 5-6 basal, 3 inner, 1-3
outer and 1 subapical (fig.88)...................... schisti
Dens with 8-9 posterior chaetae : 4-5 basal, 2 inner, 1 outer
and 1 subapical (fig.99)........................... matalini
13(11). Dens with 10-11 posterior chaetae (figs. 110, 111). acorrelata
Dens with at most 8 posterior chaetae (fig.103)............ 14
14(13). Labial papilla e with 6 guards, e7 absent (fig.17); mucro with
2 teeth; on fifth abdominal segment accp3 and accp4 sensilla
clearly shorter than medial pair (fig.146, 148).......... 15
Labial papilla e with full number of guards (fig.15); mucro
usually with 3 teeth, the proximal one hardly visible (figs.
106, 107); on fifth abdominal segment accp3 and accp4
sensilla longer than medial pair of sensilla (fig.108)......
............................................ tenuidentifera
15(14). Dens with 4 posterior chaetae (fig.144)............. nicksmeti
Dens with 6-7 posterior chaetae (fig.149)......... tianshanica
16(10). Fifth abdominal segment not with 2 anterior and 2 posterior
sensilla; modified chaetae on third tibiotarsus in males are
short and chaeta-like (fig.43); second thoracic segment with
all lateral sensilla in a single group in anterior part of
the tergite (fig.46); ventral tube with more than 4
posterior chaetae (fig.47)............................... 17
Fifth abdominal segment with 2 anterior and 2 posterior
sensilla (fig.58); modified chaetae on third tibiotarsus in
males are long and strong (fig.55); second thoracic segment
with the most lateral sensillum set posterior to other
sensilla of the lateral group (figs. 59-61); ventral tube
with 2 posterior chaetae........................... karadagi
17(16). Labium usually with 5 basomedian chaetae; males without
spine-like macrochaetae; dens tuberculated (fig.41); on
fifth abdominal segment all sensilla set in a line (fig.45).
.................................................... ladaki
Labium with 4 basomedian chaetae; males with many spine-like
macrochaetae on tergites; dens crenulated (fig.37); on fifth
abdominal segment sensillum accp2 set posterior to others
(fig.39).......................................... muriphila
18(9). Mucro with 2 teeth......................................... 19
Mucro with 3 teeth......................................... 20
19(18). Tenaculum with 3 + 3 teeth........................... ananevae
Tenaculum with 4 + 4 teeth....................... millimetrica
20(18). Fifth abdominal segment with lateral sensilla set in a
transverse line (fig.71); dens less than basal 1/3 without
anterior chaetae (figs. 67, 69); tergal sensilla short and
slightly thickened................................. kolymica
Fifth abdominal segment with medial sensilla accp2 moved
anteriorly (fig.79); dens basal half without anterior
chaetae (fig.74); tergal sensilla chaeta-like, almost as
long as ordinary chaetae...................... longisensilla
21(7). Number of sensilla on second thoracic segment to fifth
abdominal segment as 44/33334 - for third abdominal segment
(fig.8)............................................ armeriae
Number of sensilla on second thoracic segment to fifth
abdominal segment more than 44/33334 (figs. 31, 32).. titusi
22(6). Ocelli 5 + 5............................................... 23
Ocelli 8 + 8............................................... 24
23(22). Dens with 1 anterior and 1-3 posterior chaetae; mucro
bidentate, sometimes shortened or totally absent. variabilis
Dens without anterior chaeta (fig.128); mucro usually
hook-like...................................... stachanoremi
24(22). Second thoracic segment with lateral sensilla in a single
group in front of the macrochaeta........................ 25
Second thoracic segment with one of the lateral sensilla set
behind the macrochaeta (figs. 126, 131).................. 26
25(24). First to third tibiotarsus with 21-21-25 chaetae; manubrium
with 8-10 + 8-10 posterior chaetae on the main part.........
.................................................. stepposa
First to third tibiotarsus with more than 21-21-25 chaetae
(figs. 136, 137); manubrium with 17-18 + 17-18 posterior
chaetae on the main part (fig.133).................... baica
26(24). Dens with 1 anterior chaeta; mucro with 2 teeth (figs.
122-123); tenaculum with 4 + 4 teeth (fig.120)...... montana
Dens without anterior chaeta; mucro absent; tenaculum with 2 +
2 teeth............................................ tolerans