http://www.collembola.org/key/lepirtus.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Lepidocyrtus from Europe

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.

Eduardo Mateos, Departament de Biologia Animal, Facultat de Biologia, Universitat de Barcelona, 08028 Barcelona, Spain
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

Rationale

The rationale for taxa used and not used as well as subtaxonomic classification for some taxa is to be provided.

Key

Note that no distinction between subtaxa and taxa is made in the key.

1(0).   Dorsal cephalic macrochaetae R0 R1 present, R2 absent....... 2
        Dorsal cephalic macrochaetae R0 R1 present, R2 present...... 7
 
2(1).   Adult body 1.5 mm maximum length; fourth abdominal segment
          seta s absent; mesothorax not projecting......... vexillosus
        Adult body more than 2 mm in length; fourth abdominal segment
          seta s present; mesothorax projecting over the head....... 3
 
3(2).   Fourth abdominal segment dorsal pseudopori absent; labial
          chaetotaxy with all setae ciliated; second abdominal segment
          seta li absent............................................ 4
        Fourth abdominal segment dorsal pseudopori present; labial
          chaetotaxy with some smooth setae; second abdominal segment
          seta li fan-shaped.............................. curvicollis
 
4(3).   Body pigmented...................................... paradoxus
        Body without pigment........................................ 5
 
5(4).   Fourth abdominal segment seta T6 ciliated macrochaeta;
          prelabral setae smooth.................................... 6
        Fourth abdominal segment seta T6 smooth mesochaeta; prelabral
          setae ciliated................................... nigrescens
 
6(5).   Fourth abdominal segment macrochaeta E3 inserted above
          macrochaeta F2; intraocular seta q present.... montseniensis
        Fourth abdominal segment macrochaeta E3 inserted below
          macrochaeta F2; intraocular seta q absent....... flexicollis
 
7(1).   Dorsal cephalic macrochaeta T absent........................ 8
        Dorsal cephalic macrochaeta T present...................... 16
 
8(7).   Fourth abdominal segment macrochaeta C1 absent; second
          abdominal segment macrochaeta m3 absent; thoracic and
          abdominal dorsal macrochaetae 00/0000 + 2........ fimetarius
        Fourth abdominal segment macrochaeta C1 present; second
          abdominal segment macrochaeta m3 present; thoracic and
          abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3.. 9
 
9(8).   Thoracic and abdominal dorsal macrochaetae 00/0101 + 2........
           ............................................... arrabonicus
        Thoracic and abdominal dorsal macrochaetae 00/0101 + 3..... 10
 
10(9).  Unguiculus acuminate....................................... 11
        Unguiculus truncate........................................ 14
 
11(10). Mesothorax not projecting or sligthly projecting over the
          head; unguis basal pair teeth at 47-50% of the inner edge;
          unguis tooth at 70-75% of the inner edge................. 12
        Mesothorax strongly projecting; unguis basal pair teeth at 40%
          of the inner edge; unguis tooth at 53% of the inner edge....
           ................................................. instratus
 
12(11). Apex of the third row of labral setae branched............. 13
        Apex of the third row of labral setae simple....... tellecheae
 
13(12). Pigment absent or blue pigment present in antennae, ventral
          head, second to third abdominal segment and coxae.. lignorum
        Pigment present in antennae, head, body, coxae, femora and
          manubrium......................................... violaceus
 
14(10). Dorsal cephalic macrochaeta So absent; with 1 odd tooth in the
          inner margin of the unguis............................ ruber
        Dorsal cephalic macrochaeta So present; with two or no odd
          teeth in the inner margin of the unguis.................. 15
 
15(14). Inner margin of the unguis with two little odd teeth; body not
          pigmented.......................................... peisonis
        Inner margin of the unguis without odd teeth; body pigmented..
           ..................................................... uzeli
 
16(7).  Dorsal cephalic macrochaeta S absent....................... 17
        Dorsal cephalic macrochaeta S present...................... 18
 
17(16). R microchaeta; fourth abdominal segment seta F2 ciliated
          macrochaeta; labial chaetotaxy M1 M2 r' E L1 L2.... pallidus
        R short ciliated macrochaeta; fourth abdominal segment seta F2
          smooth mesochaeta; labial chaetotaxy M1 M2 R* E L1 L2.......
           .................................................. weidneri
 
18(16). Thoracic dorsal macrochaetae 00............................ 19
        Thoracic dorsal macrochaetae 10............................ 20
 
19(18). Fourth abdominal segment accesory seta s of anterior
          trichobothrium absent; second abdominal segment seta a2p
          present; second abdominal segment seta m3e absent.. serbicus
        Fourth abdominal segment accesory seta s of anterior
          trichobothrium present; second abdominal segment seta a2p
          absent; second abdominal segment seta m3e mesochaeta........
           ......................................... pseudosinelloides
 
20(18). Abdominal dorsal macrochaetae 0101 + 2..................... 21
        Abdominal dorsal macrochaetae 0301 + 3..................... 22
 
21(20). Body pigmented........................................ cyaneus
        Body without pigment.............................. lanuginosus
 
22(20). Apical antennal bulb bilobed; fourth abdominal segment setae
          E14p ciliated macrochaetae........................ bilobatus
        Apical antennal bulb simple; fourth abdominal segment setae
          E14p smooth mesochaetae.................................. 23
 
23(22). Labial seta R absent; ventral cephalic groove with 2 + 2
          ciliated setae and 1 + 1 smooth setae............ selvaticus
        Labial seta R present; ventral cephalic groove with 3 + 3
          ciliated setae........................................... 24
 
24(23). Body pigmented............................................. 25
        Body without pigment.............................. lusitanicus 1
 
25(24). Head dark pigmented, as well as thorax and first to fifth
          abdominal segment.................................... nigrus 2
        Head without pigment....................................... 26
 
26(25). Second thoracic segment with a conspicuous pigmented anterior
          margin.................................................... A 3
        Second thoracic segment without pigment.................... 27
 
27(26). Third and fourth abdominal segment with patches of dark
          pigment; third thoracic segment to second abdominal segment
          without dark pigment............................. piezoensis 4
        Third and fourth abdominal segment without patches of dark
          pigment; third thoracic segment to second abdominal segment
          with dark pigment................................. coloratus 5

Endnotes

1 As lusitanicus ssp. lusitanicus.

2 As lusitanicus ssp. nigrus.

3 As lusitanicus forma A.

4 As lusitanicus ssp. piezoensis.

5 As lusitanicus ssp. coloratus.


Differential diagnoses

A 3
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Body pigmented. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Head without pigment. Labial seta R present. Second thoracic segment with a conspicuous pigmented anterior margin. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 3 + 3 ciliated setae.

arrabonicus
Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2.

bilobatus
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb bilobed. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p ciliated macrochaetae. Thoracic dorsal macrochaetae 10.

coloratus 5
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Body pigmented. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Head without pigment. Labial seta R present. Second thoracic segment without pigment. Third and fourth abdominal segment without patches of dark pigment. Third thoracic segment to second abdominal segment with dark pigment. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 3 + 3 ciliated setae.

curvicollis
Adult body more than 2 mm in length. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment dorsal pseudopori present. Fourth abdominal segment seta s present. Labial chaetotaxy with some smooth setae. Mesothorax projecting over the head. Second abdominal segment seta li fan-shaped.

cyaneus
Abdominal dorsal macrochaetae 0101 + 2. Body pigmented. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Thoracic dorsal macrochaetae 10.

fimetarius
Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 absent. Second abdominal segment macrochaeta m3 absent. Thoracic and abdominal dorsal macrochaetae 00/0000 + 2.

flexicollis
Adult body more than 2 mm in length. Body without pigment. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment dorsal pseudopori absent. Fourth abdominal segment macrochaeta E3 inserted below macrochaeta F2. Fourth abdominal segment seta T6 ciliated macrochaeta. Fourth abdominal segment seta s present. Intraocular seta q absent. Labial chaetotaxy with all setae ciliated. Mesothorax projecting over the head. Prelabral setae smooth. Second abdominal segment seta li absent.

instratus
Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Mesothorax strongly projecting. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus acuminate. Unguis basal pair teeth at 40% of the inner edge. Unguis tooth at 53% of the inner edge.

lanuginosus
Abdominal dorsal macrochaetae 0101 + 2. Body without pigment. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Thoracic dorsal macrochaetae 10.

lignorum
Apex of the third row of labral setae branched. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Mesothorax not projecting or sligthly projecting over the head. Pigment absent or blue pigment present in antennae, ventral head, second to third abdominal segment and coxae. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus acuminate. Unguis basal pair teeth at 47–50% of the inner edge. Unguis tooth at 70–75% of the inner edge.

lusitanicus 1
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Body without pigment. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Labial seta R present. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 3 + 3 ciliated setae.

montseniensis
Adult body more than 2 mm in length. Body without pigment. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment dorsal pseudopori absent. Fourth abdominal segment macrochaeta E3 inserted above macrochaeta F2. Fourth abdominal segment seta T6 ciliated macrochaeta. Fourth abdominal segment seta s present. Intraocular seta q present. Labial chaetotaxy with all setae ciliated. Mesothorax projecting over the head. Prelabral setae smooth. Second abdominal segment seta li absent.

nigrescens
Adult body more than 2 mm in length. Body without pigment. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment dorsal pseudopori absent. Fourth abdominal segment seta T6 smooth mesochaeta. Fourth abdominal segment seta s present. Labial chaetotaxy with all setae ciliated. Mesothorax projecting over the head. Prelabral setae ciliated. Second abdominal segment seta li absent.

nigrus 2
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Body pigmented. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Head dark pigmented, as well as thorax and first to fifth abdominal segment. Labial seta R present. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 3 + 3 ciliated setae.

pallidus
R microchaeta. Dorsal cephalic macrochaeta S absent. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment seta F2 ciliated macrochaeta. Labial chaetotaxy M1 M2 r’ E L1 L2.

paradoxus
Adult body more than 2 mm in length. Body pigmented. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment dorsal pseudopori absent. Fourth abdominal segment seta s present. Labial chaetotaxy with all setae ciliated. Mesothorax projecting over the head. Second abdominal segment seta li absent.

peisonis
Body not pigmented. Dorsal cephalic macrochaeta So present. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Inner margin of the unguis with two little odd teeth. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus truncate. With two or no odd teeth in the inner margin of the unguis.

piezoensis 4
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Body pigmented. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Head without pigment. Labial seta R present. Second thoracic segment without pigment. Third and fourth abdominal segment with patches of dark pigment. Third thoracic segment to second abdominal segment without dark pigment. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 3 + 3 ciliated setae.

pseudosinelloides
Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment accesory seta s of anterior trichobothrium present. Second abdominal segment seta a2p absent. Second abdominal segment seta m3e mesochaeta. Thoracic dorsal macrochaetae 00.

ruber
Dorsal cephalic macrochaeta So absent. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus truncate. With 1 odd tooth in the inner margin of the unguis.

selvaticus
Abdominal dorsal macrochaetae 0301 + 3. Apical antennal bulb simple. Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment setae E14p smooth mesochaetae. Labial seta R absent. Thoracic dorsal macrochaetae 10. Ventral cephalic groove with 2 + 2 ciliated setae and 1 + 1 smooth setae.

serbicus
Dorsal cephalic macrochaeta S present. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment accesory seta s of anterior trichobothrium absent. Second abdominal segment seta a2p present. Second abdominal segment seta m3e absent. Thoracic dorsal macrochaetae 00.

tellecheae
Apex of the third row of labral setae simple. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Mesothorax not projecting or sligthly projecting over the head. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus acuminate. Unguis basal pair teeth at 47–50% of the inner edge. Unguis tooth at 70–75% of the inner edge.

uzeli
Body pigmented. Dorsal cephalic macrochaeta So present. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Inner margin of the unguis without odd teeth. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus truncate. With two or no odd teeth in the inner margin of the unguis.

vexillosus
Adult body 1.5 mm maximum length. Dorsal cephalic macrochaetae R0 R1 present, R2 absent. Fourth abdominal segment seta s absent. Mesothorax not projecting.

violaceus
Apex of the third row of labral setae branched. Dorsal cephalic macrochaeta T absent. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment macrochaeta C1 present. Mesothorax not projecting or sligthly projecting over the head. Pigment present in antennae, head, body, coxae, femora and manubrium. Second abdominal segment macrochaeta m3 present. Thoracic and abdominal dorsal macrochaetae 00/0101 + 2 or 00/0101 + 3. Thoracic and abdominal dorsal macrochaetae 00/0101 + 3. Unguiculus acuminate. Unguis basal pair teeth at 47–50% of the inner edge. Unguis tooth at 70–75% of the inner edge.

weidneri
R short ciliated macrochaeta. Dorsal cephalic macrochaeta S absent. Dorsal cephalic macrochaeta T present. Dorsal cephalic macrochaetae R0 R1 present, R2 present. Fourth abdominal segment seta F2 smooth mesochaeta. Labial chaetotaxy M1 M2 R* E L1 L2.


References