| Checklist of the Collembola: Key to the species of Archisotoma |
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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.
Jean-Marc Thibaud,
Laboratoire d'Entomologie, Museum National d'Histoire Naturelle, 75005 Paris, France
José G. Palacios-Vargas,
Departamento de Biologia, Universidad Nacional Autónoma de México, México D.F.
Frans Janssens,
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
1(0). Manubrium with setae........................................ 2
Manubrium without setae.............................. pauliani
2(1). Postantennal organ long, six times the length of closest eye..
................................................. nigricans
Postantennal organ normal, two to four times the length of the
closest eye............................................... 3
3(2). Eyes absent; fifth and sixth abdominal segment without
trichobothria.................................. heraultensis
Eyes present; fifth and sixth abdominal segment with 2 or 3
pairs of trichobothria.................................... 4
4(3). Trichobothria in three pairs ta, tm and tl, almost in
transversal position, one seta between ta and tm.......... 5
Trichobothria in two pairs ta and tp, almost in diagonal
position, two or three setae between ta and tp........... 14
5(4). Third tibiotarsus with dorso-apical spine................... 6
Third tibiotarsus without dorso-apical spine............... 11
6(5). Eyes eigth by side, often two of them reduced; dens elongated
with 10 setae or more..................................... 7
Eyes two by side; dens short with 3 setae....... quadrioculata
7(6). Prelabral 12 setae..................................... brucei
Prelabral at most 5 setae................................... 8
8(7). Dens with 10 to 12 setae; prelabral 2 setae................. 9
Dens with more than 25 setae; prelabral 4-5 setae.......... 10
9(8). Manubrium with 18 setae; mucro with 1 seta............. martae
Manubrium with about 10 setae; mucro without setae...... theae
10(8). Length 0.5 mm; manubrium with about 20 setae; dens with 36
setae............................................. poinsotae
Length 1.0-1.5 mm; manubrium with about 32 setae; dens with
26-30 setae........................................ besselsi
11(5). Prelabral six or more setae................................ 12
Prelabral two setae................................. pulchella
12(11). Prelabral six to nine setae................................ 13
Prelabral twenty setae............................... megalops
13(12). On front of the head 6-7 setae; postantennal organ 2.9 times
the diameter of anterior eye........................ polaris
On front of the head 8-9 setae; postantennal organ 1.8 times
the diameter of anterior eye......................... vareli
14(4). Length about 0.5 mm; prelabral two setae; ventral tube with 4
setae on each side....................................... 15
Length about 1 mm; prelabral four setae in two rows; ventral
tube with 4 or 6 setae on each side...................... 18
15(14). Eyes 5 per side, two of them reduced................. sabulosa
Eyes 6, 7 or 8 per side usually one or two reduced and
difficult to see......................................... 16
16(15). Between the two trichobothria ta five or six setae......... 17
Between the two trichobothria ta two or three setae. litoralis
17(16). Dens with 18 setae; anterior subcoxa furcalis with 13-17
setae; posterior subcoxa furcalis with 11-14 setae. vaoensis
Dens with 20-24 setae; anterior subcoxa furcalis with 19-21
setae; posterior subcoxa furcalis with 15-18 setae..........
............................................... gourbaultae
18(14). Length 0.8-1.1 mm; manubrium with about twenty to thirty
setae; dens with about twenty to thirty setae; ventral tube
with 4 setae on each side.................... interstitialis
Length 1.0-1.5 mm; manubrium with about twenty setae; dens
with about fourty setae; ventral tube with 6 setae on each
side............................................... utinomii