| Checklist of the Collembola: Key to the species of Isotomiella |
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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.
L'ubomír Kovác,
Department of Zoology, Institute of Biology and Ecology, Faculty of Sciences, University of P.J. Safárik, Kosice, Slovak Republic
José G. Palacios-Vargas,
Laboratorio de Ecologia y Sistemática de Microartrópodos, Departamento de Biología, Facultad de Ciensas, UNAM, México D.F.
Frans Janssens,
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
1(0). Mucro bidentate or tridentate............................... 2
Mucro rudimentary or falciform............................. 40
2(1). Mucro bidentate............................................. 3
Mucro tridentate........................................... 15
3(2). Dens with 6 ventral and 1 dorsal setae; manubrium with 1 + 1
ventro-distal setae....................................... 4
Dens with at least 10 ventral and 4 dorsal setae; manubrium
with 1 + 1 or more ventro-distal setae.................... 5
4(3). Sensillar formula: 3?/00012; third tibiotarsus with 2
cuticular digitations............................. distincta
Sensillar formula: 32/11215; third tibiotarsus with 4
cuticular digitations.............................. digitata
5(3). Dens with 10-14 ventral and 2-4 dorsal setae................ 6
Dens with at least 15 ventral and 5-6 dorsal setae.......... 9
6(5). Dens with 10-13 ventral and 4 dorsal setae; manubrium with 1 +
1 or 2 + 2 ventro-distal setae............................ 7
Dens with 10-14 ventral and 2 dorsal setae; manubrium with 1-2
+ 1-2 ventro-distal setae.......................... spinifer
7(6). Manubrium with 1 + 1 ventro-distal setae; sensillar formula:
32/11212.................................................. 8
Manubrium with 2 + 2 ventro-distal setae; sensillar formula:
32/00135.......................................... delamarei
8(7). Second tibiotarsus and third tibiotarsus with 1 distal spine..
.................................................... canina
Second tibiotarsus and third tibiotarsus without modified
setae............................................ quadriseta
9(5). Dens with 17-36 ventral setae; manubrium with 2 + 2 or more
ventro-distal setae...................................... 10
Dens with up to 17 ventral setae; manubrium with 1 + 1
ventro-distal setae...................................... 13
10(9). Dens with 17-25 ventral and 5 dorsal setae; manubrium with 2 +
2 ventro-distal setae.................................... 11
Dens with 36 ventral and 5 dorsal setae; manubrium with 5 + 5
ventro-distal setae.............................. aluluminor
11(10). Axial setae pattern of first to fourth abdominal segment: 4,
4, 4, 6.................................................. 12
Axial setae pattern of first to fourth abdominal segment: 6,
6, 6, 6............................................... alulu
12(11). Fourth antennal segment sensilla s1-6 normal; macrosetae
pattern second thoracic segment to fourth abdominal segment:
1, 1/1, 2, 4, 4.................................. nummulifer
Fourth antennal segment sensilla s1-6 very reduced; macrosetae
pattern second thoracic segment to fourth abdominal segment:
1, 1/1, 3, 3, 4..................................... fellina
13(9). Manubrium with 1 or 2 lateral setae; sensillar formula
different from 32/00125.................................. 14
Manubrium without lateral setae; sensillar formula: 32/00125..
................................................... sodwana
14(13). Dens with 5 dorsal setae; manubrium with 1 lateral seta;
sensillar pattern: 32/11152; third tibiotarsus with 2 strong
distal setae...................................... bidentata
Dens with 6 dorsal setae; manubrium with 2 lateral setae;
sensillar pattern: 32/12325; third tibiotarsus distal setae
normal............................................ dupliseta
15(2). Dens with more than 14 ventral and 5-7 dorsal setae........ 16
Dens with up to 14 ventral and 3-4 dorsal setae............ 39
16(15). Dens with 15-36 ventral setae; manubrium with less than 5 + 5
ventro-distal setae...................................... 17
Dens with 24-79 ventral setae; manubrium with 5 + 5 or more
ventro-distal setae...................................... 20
17(16). Manubrium with 1 + 1 ventro-distal and 1 lateral seta. barrana
Manubrium with 2-4 + 2-4 ventro-distal setae............... 18
18(17). Dens with 15-19 ventral and 5 dorsal setae; manubrium with 2-4
+ 2-4 ventro-distal and 2-3 lateral setae........ deforestai
Dens with 27-36 ventral and 5-6 dorsal setae; manubrium with 4
+ 4 ventro-distal setae.................................. 19
19(18). Dens with 27-28 ventral and 5 dorsal setae; manubrium with 1-2
lateral setae...................................... edaphica
Dens with 32-36 ventral and 6 dorsal setae; manubrium with 3
lateral setae.................................... hygrophila
20(16). Manubrium with 5 + 5 ventro-distal setae................... 21
Manubrium with 6 + 6 ventro-distal and 4 lateral setae,
unpaired ventro-proximal setae on manubrium absent..........
................................................ sensillata
21(20). Dens with 5 dorsal setae................................... 22
Dens with 6-7 dorsal setae................................. 23
22(21). Dens with 28-32 ventral setae; manubrium with 4-5 + 4-5
ventro-distal, 2-3 unpaired ventro-proximal and 2-3 lateral
setae........................................... leksawasdii
Dens with 40-45 ventral setae; manubrium with 5 + 5
ventro-distal, 3-4 unpaired ventro-proximal and 3-4 lateral
setae............................................... barisan
23(21). Unpaired ventro-proximal setae on manubrium absent......... 24
Unpaired ventro-proximal setae on manubrium present........ 34
24(23). Dens with 24-32 ventral setae.............................. 25
Dens with 35-62 ventral setae.............................. 26
25(24). Dens with 24-28 ventral setae; manubrium with 3 lateral setae;
anapleurum-katapleurum-coxa on the proleg with 1, 1, 2
setae................................................. dubia
Dens with 29-32 ventral setae; manubrium with 3-4 lateral
setae; anapleurum-katapleurum-coxa on the proleg with 1, 3,
2 (3) setae....................................... thiollayi
26(24). Axial setae pattern first to fourth abdominal segment: 6, 6,
6, 6-8................................................... 27
Axial setae pattern first to fourth abdominal segment: 8-9, 8,
7-9, 6.......................................... unguiculata
27(26). Tubus ventralis with 1 + 1 posterior seta.......... barivierai
Tubus ventralis with 2 + 2 or 3 + 3 posterior setae........ 28
28(27). First abdominal segment with lateral field devoid of setae....
.......................................... symetrimucronata
First abdominal segment without lateral field devoid of setae.
........................................................ 29
29(28). Tubus ventralis with 2 + 2 posterior setae................. 30
Tubus ventralis with 3 + 3 posterior setae.............. arlei
30(29). Manubrium with 3 lateral setae............................. 31
Manubrium with 4 lateral setae............................. 32
31(30). Dens with 37-41 ventral setae; ciliated setae on first
antennal segment present........................... cribrata
Dens with more than 36 ventral setae; ciliated setae on first
antennal segment absent............................... minor
32(30). Ciliated setae on first antennal segment absent............ 33
Ciliated setae on first antennal segment present.... granulata
33(32). Fourth antennal segment with 10 supplementary sensilla; second
to third abdominal segment with ciliated ventro-lateral
mesosetae; sensillum spl (v):giii=1.2............... insulae
Fourth antennal segment with 8 supplementary sensilla; second
to third abdominal segment with all ventro-lateral mesosetae
smooth; sensillum spl (v):giii=0.9.................. similis
34(23). Manubrium with 2-4 ventro-proximal setae................... 35
Manubrium with around 8 ventro-proximal and 4 lateral setae...
................................................. paraminor
35(34). Dens with 6 dorsal setae................................... 36
Dens with 7 dorsal setae.......................... madeirensis
36(35). Dens with 29-38 ventral setae................... inthanonensis
Dens with more than 40 ventral setae....................... 37
37(36). Dens with 41-43 ventral setae....................... amazonica
Dens with 45-54 ventral setae.............................. 38
38(37). Ciliated setae on first antennal segment absent; dens with
47-54 ventral setae; manubrium with 2-4 ventro-proximal and
4 lateral setae..................................... hirsuta
Ciliated setae on first antennal segment present; dens with
45-51 ventral setae; manubrium with 2-3 ventro-proximal and
3-4 lateral setae.................................. michonae
39(15). Dens with 12-14 ventral and 4 dorsal setae; manubrium with 1 +
1 ventro-distal and 0-2 lateral setae............. brevidens
Dens with 9-10 ventral and 3 dorsal setae; manubrium with 3-5
+ 3-5 ventro-distal and 3 lateral setae............. spinosa
40(1). Mucro falciform............................................ 41
Mucro rudimentary.......................................... 42
41(40). Dens with 15 ventral and 3 dorsal setae; manubrium with 1 + 1
ventro-distal and 1-2 lateral setae................... annae
Dens with 6 ventral and 1 dorsal setae; manubrium with 1 + 1
ventro-distal setae, lateral setae on manubrium absent......
................................................... falcata
42(40). Second and third thoracic segment with 2 and 1 sensilla
respectively; sensilla s1-6 on fourth antennal segment
small; spl sensillum on fifth and sixth abdominal segment
shorter than giii................................... proxima
Second and third thoracic segment with 3 and 1 (2) sensilla
respectively; sensilla s1-6 on fourth antennal segment
normal; spl sensillum on fifth and sixth abdominal segment 3
times longer than giii............................... barrai
Endnotes
1 Isotomiella gracilimucronata Rusek, 1981 from Iraq with tridentate mucro, 4+4 ventro-distal and 2 lateral setae on manubrium, close to Isotomiella edaphica Bedos & Deharveng, 1994 described from Thailand is not included in the key since insufficient information on the principal characters in the original description.
2 Isotomiella ciliata Cardoso, 1969 from Mozambique with tridentate mucro, 5+5 ventro-distal and 1 ventro-proximal seta on manubrium is not included in the key since insufficient information on the principal characters in the original description.
3 Isotomiella muscorum (Schäffer, 1900) from Germany with bidentate mucro is not included in the key since insufficient information on the principal characters in the original description.