| Checklist of the Collembola: Key to the species of Dicranocentrus |
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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.
1(0). Dental spines absent........................................ 2
Dental spines present...................................... 16
2(1). First abdominal tergum with macrochaetae.................... 3
First abdominal tergum without macrochaetae................ 15
3(2). First abdominal tergum with four or six setae............... 4
First abdominal tergum with three or five setae............. 9
4(3). First abdominal tergum with four setae...................... 5
First abdominal tergum with six setae....................... 7
5(4). Fourth abdominal tergum with macrochaetae........... violaceus
Fourth abdominal tergum without macrochaetae................ 6
6(5). Unguiculus toothed................................ janetscheki
Unguiculus untoothed................................ fasciatus
7(4). Second abdominal tergum with 2 setae.................. thaicus
Second abdominal tergum with 3 or 4 setae................... 8
8(7). Second abdominal tergum with 3 setae............... deharvengi
Second abdominal tergum with 4 setae................ indecisus
9(3). First abdominal segment with five setae per side; tibiotarsi
with rows of smooth setae................................ 10
First abdominal segment with three setae per side; tibiotarsi
with or without rows of smooth setae..................... 11
10(9). Tibiotarsus with row of 6-7 smooth setae on distal third of
inner margin....................................... yoshiius
Tibiotarsus with rows of smooth setae on inner and outer
margins........................................... lawrencei
11(9). Tibiotarsi with rows of smooth setae; unguiculus toothed... 12
Tibiotarsi without smooth setae; unguiculus untoothed...... 14
12(11). Tibiotarsi with rows of smooth setae both on inner margins. 13
Tibiotarsi with rows of smooth setae only on inner margin.....
................................................. assimilis
13(12). Tenent hair clavate; unguiculus with a very conspicuous inner
tooth............................................... inermis
Tenent hair lanceolate; unguiculus without inner tooth........
.............................................. solomonensis
14(11). Tibiotarsi pigmented............................. inermodentes
Tibiotarsi without pigment............................ indicus
15(2). Macrochaetae p 4 in number........................... litoreus
Macrochaetae p 7 in number......................... halophilus
16(1). Spines present on both inner and outer margins of the dentes..
........................................................ 17
Spines present only on the inner margin of the dentes...... 25
17(16). Macrochaetae p absent...................................... 18
Macrochaetae p present..................................... 20
18(17). Second thoracic segment with 5 posterior macrochaetae.........
.................................................. spinosus
Second thoracic segment with 6 posterior macrochaetae...... 19
19(18). Fourth abdominal segment with 2 anterior macrochaetae;
internal margin of dens with up to 35 spines in two rows;
labium without ciliated setae.................... biseriatus
Fourth abdominal segment with 3 anterior macrochaetae;
internal margin of dens with up to 67 spines in four rows;
labium with ciliated setae..................... reunionensis
20(17). Sixth antennal segment absent...................... capitaneus
Sixth antennal segment present............................. 21
21(20). Fourth abdominal segment with 2 anterior macrochaetae; head
macrochaeta s2 absent.................................... 22
Fourth abdominal segment with 3 anterior macrochaetae; head
macrochaeta s2 present...................... chimborazoensis
22(21). External margin of dens with up to 14 spines; head colour
equally dark or lighter than body colour; apex of long
macrochaetae not bifurcated; third thoracic segment with 9
macrochaetae............................................. 23
External margin of dens with up to 50 spines; head colour
darker then body colour; apex of long macrochaetae
bifurcated; third thoracic segment with 8 macrochaetae......
.................................................. heloisae
23(22). Fourth abdominal segment with 2 interior macrochaetae, one
anterior and the other posterior; internal margin of dens
with 31-37 spines in 3-4 rows; internal pair of ungual teeth
located not to close to base............................. 24
Fourth abdominal segment with 3 interior macrochaetae lined up
longitudinally; internal margin of dens with up to 16 spines
in two rows; internal pair of ungual teeth located close to
base............................................... gracilis
24(23). Body colour violet; internal margin of unguis with 2 rows of
small teeth at basal apex; fifth antennal segment about 2
times longer than sixth antennal segment........... peckorum
Body without pigment; internal margin of unguis without teeth;
fifth antennal segment and sixth antennal segment subequal
in length...................................... colombiensis
25(16). Sixth abdominal segment characteristically elongated in mature
specimens, its length approaching that of fourth abdominal
segment............................................ cercifer
Sixth abdominal segment not particularly elongated, never as
long as fifth abdominal segment.......................... 26
26(25). First abdominal tergum with five or six macrochaetae....... 27
First abdominal tergum with two or three macrochaetae...... 37
27(26). First abdominal tergum with five macrochaetae.............. 28
First abdominal tergum with six macrochaetae........... gapudi
28(27). Tibiotarsi with rows of smooth setae on inner margin..........
............................................... sundanensis
Tibiotarsi without smooth setae on inner margin............ 29
29(28). Tenent hair conspicuously clavate.......................... 30
Tenent hair not conspicuously clavate...................... 35
30(29). Macrochaetae p absent.................................. millsi
Macrochaetae p present..................................... 31
31(30). Macrochaetae p 3 in number.......................... delamarei
Macrochaetae p more than 3 in number....................... 32
32(31). Unguis with a third distal unpaired tooth.................. 33
Unguis with only one distal tooth.................... nigritus
33(32). Body heavily pigmented.............................. orellanae
Body not particularly heavily pigmented.................... 34
34(33). Body diffusely pigmented............................. schoetti
Body without pigment except the eyepatches........... edicitae
35(29). Tenent hair clavate but apex is thin and may appear lanceolate
in lateral view.......................................... 36
Tenent hair lanceolate............................ longicornis
36(35). Dental spines arranged in a single row................ celatus
Dental spines arranged proximally in various rows and distally
in a single row extending past middle of dens...... zebratus
37(26). First abdominal tergum with three setae.................... 38
First abdominal tergum with two setae...................... 43
38(37). Tibiotarsi with rows of smooth setae on inner margin....... 39
Tibiotarsi without rows of smooth setae........... antillensis
39(38). Macrochaetae p absent.................................. marias 3
Macrochaetae p present..................................... 40
40(39). Fifth antennal segment about 2.7 times longer than sixth
antennal segment................................. luzonensis
Fifth antennal segment about as long as sixth antennal
segment.................................................. 41
41(40). Fifth antennal segment about 1.2 longer than sixth antennal
segment.................................................. 42
Fifth antennal segment subequal in length to sixth antennal
segment........................................... meruensis
42(41). Pigmentation deep dark-blue; ratio length of antenna/diameter
of head about 2.4; behind postlabial quadrangle, on each
side near posterior margin of head, a pair of long smooth
setae; unguis with 1-2 distal unpaired teeth.... paramoensis
Pigmentation scarcely dark blue; ratio length of
antenna/diameter of head about 3.5; behind postlabial
quadrangle, on each side near posterior margin of head, a
group of 5 short, stout and smooth setae; unguis without
distal unpaired teeth............................ bidentatus
43(37). Macrochaetae p absent.................................. marias
Macrochaetae p present............................. orientalis
Endnotes
1 The term dental spines includes spines present on the dental lobe (Mari Mutt, 1979:19).
2 The patterns of dorsal macrochaetotaxy are symmetrical on both sides of a dorsal median longitudinal line. Statements like "first abdominal tergum with three setae", refer to the number of setae on one side of the segment, not to the total number of setae on the segment (in this case, six) (Mari Mutt, 1979:19).
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