| Checklist of the Collembola: Key to the species of Willemia |
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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.
Cyrille D'Haese,
Laboratoire d'Entomologie, Muséum national d'Histoire naturelle, F-75005 Paris, France
Arturo García-Gómez,
Laboratorio de Ecología y Sistemática de Microartrópodos, Universidad NAM, México D.F.
Leopoldo Q. Cutz-Pool,
Laboratorio de Ecología y Sistemática de Microartrópodos, Universidad NAM, México D.F.
Frans Janssens,
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
1(0). Setae a0 absent on the head................................. 2
Setae a0 present on the head............................... 13
2(1). Sensilla e3 and i2 of antennal segment iv are large, globular,
placed in cavity and covered in part by tegumental fold;
setae m3 absent on third thoracic tergum.................. 3
Sensilla e3 and i2 of antennal segment iv are small, globular,
not placed in cavity and not covered by tegumental fold;
setae m3 present on third thoracic tergum................ 12
3(2). Fifth abdominal tergum with setae s in p2 position; first
thoracic tergum with 3 + 3 setae.......................... 4
Fifth abdominal tergum with setae s in p3 position; first
thoracic tergum with 2 + 2 setae, curved and crenellated....
............................................... nadchatrami
4(3). Apical vesicle absent; anal spines absent................... 5
Apical vesicle present; anal spines present................. 6
5(4). Antennal segment iv with ordinary setae and two lanceolate
setae; postantennal organ with 15 to 17 vesicles. deharvengi
Antennal segment iv with ordinary setae, without lanceolate
setae; postantennal organ with 18 to 20 vesicles. setonychia
6(4). Abdominal terga iv and v with setae s lanceolate.... delamarei
Abdominal terga iv and v with setae s subcylindrical and
acuminate................................................. 7
7(6). Tibiotarsi i and ii with 11 setae, tibiotarsi iii with 11 or
10 setae.................................................. 8
Tibiotarsi with 12 setae................................... 10
8(7). Postantennal organ with 12 to 14 vesicles; setae c1 absent on
the head.................................................. 9
Postantennal organ with about 20 vesicles; setae c1 present on
the head.......................................... annapurna
9(8). Setae a3 absent on abdominal sterna ii and iv; setae s m7 on
third thoracic tergum lanceolate..................... wandae
Setae a3 present on abdominal sterna ii and iv; setae s m7 on
third thoracic tergum subcylindrical........... buddenbrocki
10(7). Antennal segment iv with four subcylindrical sensilla hardly
distinguishable from ordinary setae; third thoracic tergum
with setae s m7 lanceolate....................... nepalensis
Antennal segment iv with two or four subcylindrical sensilla
clearly differentiated from ordinary setae; third thoracic
tergum with setae s m7 subcylindrical and acuminate...... 11
11(10). Antennal segment iv with four subcylindrical sensilla;
postantennal organ with 10 to 15 vesicles..... neocaledonica
Antennal segment iv with two subcylindrical sensilla;
postantennal organ with 7 to 10 vesicles......... brevispina
12(2). Postantennal organ with 10 to 150 vesicles; anal spines
present........................................... arenicola
Postantennal organ with 15 vesicles or more; anal spines
absent............................................ meybholae
13(1). Setae a1 absent on fourth abdominal sternum................ 14
Setae a1 present on fourth abdominal sternum............... 27
14(13). Tibiotarsi with 11 or 12 setae; ventral tube with 5 + 5 setae.
........................................................ 15
Tibiotarsi with more than 12 setae; ventral tube with 4 + 40
setae.................................................... 16
15(14). Postantennal organ with 3 vesicles; tibiotarsi iii with 110
setae............................................. trilobata
Postantennal organ with 4 vesicles; tibiotarsi iii with 120
setae.............................................. namibiae
16(14). Anal spines absent......................................... 17
Anal spines present........................................ 23
17(16). Sensilla on antennal segment iv, all thick and subcylindrical.
................................................. granulata
Sensilla on antennal segment iv, with another shape........ 18
18(17). Sensilla i1 and d absent on antennal segment iv - i. e. d and
i1 not differentiated from ordinary setae; setae a2 present
on abdominal terga ii and iii............................ 19
Sensilla i1 present on antennal segment iv and some sensilla
are candle flame-shaped; setae a2 absent on abdominal terga
ii and iii............................................... 22
19(18). Antennal segment iv with 2 sensilla - e3 and i2 - globular. 20
Antennal segment iv with 3 sensilla - e2, e3 and i2 candle
flame-shaped.................................... trisphaerae
20(19). Postantennal organ's vesicles smooth....................... 21
Postantennal organ's vesicles with numerous secondary
tubercles............................................. arida
21(20). Setae m2 absent on fourth abdominal tergum; setae s
subcylindrical with acuminate apex on first abdominal
tergum............................................. japonica
Setae m2 present on fourth abdominal tergum; setae s
lanceolate on first abdominal tergum............. fjellbergi
22(18). Sensilla d absent on antennal segment iv - i. e. d not
differentiated from ordinary setae............ elisabetharum
Sensilla d present on antennal segment iv.............. denisi
23(16). Fifth abdominal tergum with setae s in p2 position - thus
setae p2 absent.......................................... 24
Fifth abdominal tergum with setae s in p3 position - thus
setae p2 present......................................... 26
24(23). Postantennal organ with 4 vesicles................. intermedia
Postantennal organ with 7 vesicles or more................. 25
25(24). First, second and third tibiotarsus with 12, 12 and 11 setae
respectively; setae a2 present on abdominal terga ii and
iii; setae m1 and m3 present on fourth abdominal tergum.....
................................................ subbulbosa
First, second and third tibiotarsus with 14, 14 and 13 setae
respectively; setae a2 absent on abdominal terga ii and iii;
setae m1 and m3 absent on fourth abdominal tergum...........
................................................ persimilis
26(23). Apical vesicle simple; postantennal organ's vesicles
blackberry-shaped; postantennal organ with 4 vesicles.......
............................................... multilobata
Apical vesicle trilobate; postantennal organ's vesicles
smooth; postantennal organ with 6 to 80 vesicles. bellingeri
27(13). Fifth abdominal tergum with setae s in p2 position - thus
setae p2 absent.......................................... 28
Fifth abdominal tergum with setae s in p3 position - thus
setae p2 present......................................... 30
28(27). M-row absent on fourth abdominal tergum; setae a4 absent on
second and third thoracic tergum...................... virae
M-row present on fourth abdominal tergum; setae a4 present on
second and third thoracic tergum......................... 29
29(28). Postantennal organ with 7 vesicles; sensillum e1 present on
fourth antennal segment; setae m4 present on fourth
abdominal tergum.................................... bedosae
Postantennal organ with 8 vesicles; sensillum e1 absent on
fourth antennal segment; setae m4 absent on fourth abdominal
tergum.................................... iztaccihuatlensis
30(27). Setae m1 absent on fourth abdominal tergum................. 31
Setae m1 present on fourth abdominal tergum................ 33
31(30). Sensilla d and i1 absent - i. e. d and i1 not differentiated
from ordinary setae - on antennal segment iv............. 32
Sensilla d and i1 present on antennal segment iv........ dubia
32(31). Empodial appendage absent............................. koreana
Empodial appendage present....................... scandinavica
33(30). Anal lobes with 2 hr setae; setae m3 present on abdominal
terga ii and iii................................ anophthalma
Anal lobes with 3 hr setae; setae m3 absent on abdominal terga
ii and iii............................................... 34
34(33). Number of prelabral setae 2; sensilla e1 present on antennal
segment iv.......................................... similis
Number of prelabral setae 4; sensilla e1 absent - i. e. e1 not
differentiated from ordinary setae - on antennal segment iv.
............................................. christianseni
Endnotes
1 Willemia biseta Christiansen & Bellinger, 1980 and Willemia bulbosa Bonet, 1945 are not included in the key.