Checklist of the Collembola: Key to the genera of Entomobryidae

http://www.collembola.org/key/entoidae.htm - Last updated on 2009.09.30 by Frans Janssens

Checklist of the Collembola: Key to the genera of Entomobryidae

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.

Rationale

Check the rationale for taxa used and not used as well as subtaxonomic classification for some taxa.

Key

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

1(0). Antennae with 4 segments and fourth abdominal segment at midline more than 2.5 times length of third............... 2 Antennae with 5 or 6 segments or antennae with 4 segments, but then fourth abdominal segment at midline less than 2 times length of third.......................................... 42

2(1). Body with scales (fig.1).................................... 3 Body without scales........................................ 31

Fig.1.

3(2). Head with 6 + 6 or fewer eyes............................... 4 Head with 8 + 8 eyes....................................... 10

4(3). Second antennal segment with spine-like projection (fig.2)... ............................................. Lepidosinella Second antennal segment without spine-like projection....... 5

Fig.2.

5(4). Mucronal lamella absent..................................... 6 Mucronal lamella projecting from end of dens (fig.3a)...... 9

Fig.3.

6(5). Dental scales absent................................ Hawinella Dental scales present....................................... 7

7(6). Mucro bidentate (fig.3c)................................... 8 Mucro falcate..................................... Sinelloides

8(7). Fourth antennal segment greatly swollen (fig.4).............. ............................................. Rambutsinella Fourth antennal segment not greatly swollen..... Pseudosinella

Fig.4.

9(5). Antennae less than .5 times as long as head and body combined. ................................................. Sulcuncus Antennae more than 1.4 times as long as head and body combined........................................ Metasinella

10(3). Mucro bidentate (fig.5c).................................. 11 Mucro falcate (fig.5a&b).................................. 29

Fig.5.

11(10). Dental scales absent....................................... 12 Dental scales present...................................... 15

12(11). Body scales ridges not unusual narrow (fig.1a, b&d)........ 13 Body scales ridges unusual narrow (fig.1c)........ Americabrya

13(12). Claw with 1 or 2 unpaired inner teeth (fig.6b&c).......... 14 Claw without unpaired inner teeth (fig.6a)........ Lepidobrya

Fig.6.

14(13). Posterior marginal scales on body segments elongate (fig.7a). ............................................ Janetschekbrya Posterior marginal scales on body segments not elongate (fig.7b)......................................... Willowsia

Fig.7.

15(11). Body scales dark pointed and heavily striate; sixth abdominal segment with finger like projection (fig.8)..... Epimetrura Body scales varied; sixth abdominal segment without finger like projection.......................................... 16

Fig.8.

16(15). Dental spines absent....................................... 17 Dental spines present (fig.9)............................. 28

Fig.9.

17(16). Body scales all rounded or truncate (fig.10c&d); body scales striated finely.......................................... 18 Body scales some apically pointed (fig.10a&b); body scales striated heavily......................................... 26

Fig.10.

18(17). Dental basal appendix absent............................... 19 Dental basal appendix present (fig.11)..................... 20

Fig.11.

19(18). Antennae and legs not scaled....................... Lanocyrtus Antennae and legs scaled......................... Lepidocyrtus

20(18). Dental appendix pointed (fig.11b).......................... 21 Dental appendix rounded (fig.11a).......................... 23

21(20). Ventral tube scales absent......................... Acrocyrtus Ventral tube scales present................................ 22

22(21). Ventral tube scaled on both faces................. Onerocyrtus Ventral tube scaled on posterior face only......... Carocyrtus

23(20). Mucronal basal spine simple................................ 24 Mucronal basal spine with spinelet (fig.12)........ Setogaster

Fig.12.

24(23). First antennal segment and femur not scaled................ 25 First antennal segment and femur scaled............ Dahlcyrtus

25(24). Mouthparts not projecting........................ Cinctocyrtus Mouthparts projecting, labrum (fig.13a), labium (fig.13b) and mandibles (fig.13c) elongate.................. Rhynchocyrtus

Fig.13.

26(17). Manubrium with distal thick blunt macrochaetae (fig.14)....... ........................................... Lepidocyrtoides Manubrium without distal thick blunt macrochaetae.......... 27

Fig.14.

27(26). Colour of body scales all dark brown; dens scaled on only basal half......................................... Vietsira Colour of body scales some hyaline; dens scaled for most of ventral surface.................................. Lepidosira

28(16). Scales brown; antenna with apical bulb.......... Acanthocyrtus Scales hyaline; antenna without apical bulb...... Acanthurella

29(10). Dens with scales........................................ Seira Dens without scales........................................ 30

30(29). Mucronal basal spine absent (fig.5a)................ Desertia Mucronal basal spine present (fig.5b)............ Drepanosira

31(2). Head with 6 + 6 or fewer eyes.............................. 32 Head with 8 + 8 eyes....................................... 33

32(31). Furca with bidentate mucro (fig.15c).................. Sinella Furca with falcate mucro (fig.15a).................. Coecobrya

Fig.15.

33(31). Mucro bidentate (fig.15c).................................. 34 Mucro falcate (fig.15a&b).................................. 39

34(33). Intersegmental membranes with many microsetae (fig.16)........ ............................................... Marginobrya Intersegmental membranes without microsetae................ 35

Fig.16.

35(34). Dental spines absent....................................... 36 Dental spines present at basis (fig.17)............... Homidia

Fig.17.

36(35). Body setae flattened, scale like (fig.18).......... Himalanura Body setae not flattened................................... 37

Fig.18.

37(36). Antenna usually with apical bulb; inner tibiotarsal setae with all setae similar (fig.19b).............................. 38 Antenna without apical bulb; inner tibiotarsal setae with some setae apparently much more finely ciliate than others (fig.19a).................................... Entomobryoides

Fig.19.

38(37). Mucronal basal spine absent (fig.20a)............. Mesentotoma Mucronal basal spine present (fig.20b)............. Entomobrya

Fig.20.

39(33). Lasiotrichia or large macrochaetae bases absent on anterior margin of thorax............................... Prodrepanura Lasiotrichia or large macrochaetae bases present on anterior margin of thorax......................................... 40

40(39). Mucronal basal spine absent (fig.15b)...................... 41 Mucronal basal spine present (fig.15a).............. Drepanura

41(40). Claw with four inner teeth............................... Calx Claw with one or two inner teeth.................... Isotobrya

42(1). Body with scales (fig.1)................................... 43 Body without scales........................................ 50

43(42). Antennae with 5 segments (fig.21b).......................... 44 Antennae with 6 segments (fig.21a).......................... 48

Fig.21.

44(43). Scales hyaline and fusiform (fig.1a) absent from antennae and furcula........................................ Mastigoceras Scales strongly and apically rounded or truncate (fig.1b) present on antennae and furcula.......................... 45

45(44). Fourth antennal segment clearly annulate (fig.22).............. ............................................. Verhoeffiella Fourth antennal segment not annulate....................... 46

Fig.22.

46(45). First abdominal segment with at least 1 + 1 macrochaetae (fig.23).................................................. 47 First abdominal segment without macrochaetae...... Heteromurus

Fig.23.

47(46). Dental spines absent.......................... Heteromurtrella Dental spines present (fig.24)...................... Alloscopus

Fig.24.

48(43). Fully developed scales fusiform (fig.1a)..... Dicranorchesella Fully developed scales rounded or truncate (fig.1b)........ 49

49(48). Prelabral setae bifurcate (fig.25)........ Pseudodicranocentrus Prelabral setae not bifurcate.................. Dicranocentrus

Fig.25.

50(42). Postantennal organ absent.................................. 51 Postantennal organ rudimentary (fig.26)..................... 55

Fig.26.

51(50). Head with 2 + 2 or fewer eyes.............................. 52 Head with 7 + 7 or more eyes............................... 53

52(51). Mucro with strong anteapical tooth (fig.27b)...... Neorchesella Mucro with very weak anteapical tooth (fig.27a).... Bessoniella

Fig.27.

53(51). Second antennal segment not subsegmented (fig.21b&c)........ 54 Second antennal segment subsegmented (fig.21a)...... Orchesella

54(53). First antennal segment not subdivided (fig.21c).... Corynothrix First antennal segment subdivided (fig.21b)...... Orchesellides

55(50). Mucro bidentate (fig.28b)...................... Australotomurus Mucro falcate (fig.28a)..................................... 56

Fig.28.

56(55). Unguis with three longitudinal ridges............. Hispanobrya Unguis without longitudinal ridges......................... 57

57(56). Postantennal organ 15 times 5 micron, narrowed in its inner side.............................................. Nothobrya Postantennal organ less than 4 micron across simple and flat.. ................................................... Capbrya


1(0). Antennae with 4 segments and fourth abdominal segment at midline more than 2.5 times length of third............... 2 Antennae with 5 or 6 segments or antennae with 4 segments, but then fourth abdominal segment at midline less than 2 times length of third.......................................... 42
2(1). Body with scales (fig.1).................................... 3 Body without scales........................................ 31
Fig.1.
3(2). Head with 6 + 6 or fewer eyes............................... 4 Head with 8 + 8 eyes....................................... 10
4(3). Second antennal segment with spine-like projection (fig.2)... ............................................. Lepidosinella Second antennal segment without spine-like projection....... 5
Fig.2.
5(4). Mucronal lamella absent..................................... 6 Mucronal lamella projecting from end of dens (fig.3a)...... 9
Fig.3.
6(5). Dental scales absent................................ Hawinella Dental scales present....................................... 7
7(6). Mucro bidentate (fig.3c)................................... 8 Mucro falcate..................................... Sinelloides
8(7). Fourth antennal segment greatly swollen (fig.4).............. ............................................. Rambutsinella Fourth antennal segment not greatly swollen..... Pseudosinella
Fig.4.
9(5). Antennae less than .5 times as long as head and body combined. ................................................. Sulcuncus Antennae more than 1.4 times as long as head and body combined........................................ Metasinella
10(3). Mucro bidentate (fig.5c).................................. 11 Mucro falcate (fig.5a&b).................................. 29
Fig.5.
11(10). Dental scales absent....................................... 12 Dental scales present...................................... 15
12(11). Body scales ridges not unusual narrow (fig.1a, b&d)........ 13 Body scales ridges unusual narrow (fig.1c)........ Americabrya
13(12). Claw with 1 or 2 unpaired inner teeth (fig.6b&c).......... 14 Claw without unpaired inner teeth (fig.6a)........ Lepidobrya
Fig.6.
14(13). Posterior marginal scales on body segments elongate (fig.7a). ............................................ Janetschekbrya Posterior marginal scales on body segments not elongate (fig.7b)......................................... Willowsia
Fig.7.
15(11). Body scales dark pointed and heavily striate; sixth abdominal segment with finger like projection (fig.8)..... Epimetrura Body scales varied; sixth abdominal segment without finger like projection.......................................... 16
Fig.8.
16(15). Dental spines absent....................................... 17 Dental spines present (fig.9)............................. 28
Fig.9.
17(16). Body scales all rounded or truncate (fig.10c&d); body scales striated finely.......................................... 18 Body scales some apically pointed (fig.10a&b); body scales striated heavily......................................... 26
Fig.10.
18(17). Dental basal appendix absent............................... 19 Dental basal appendix present (fig.11)..................... 20
Fig.11.
19(18). Antennae and legs not scaled....................... Lanocyrtus Antennae and legs scaled......................... Lepidocyrtus
20(18). Dental appendix pointed (fig.11b).......................... 21 Dental appendix rounded (fig.11a).......................... 23
21(20). Ventral tube scales absent......................... Acrocyrtus Ventral tube scales present................................ 22
22(21). Ventral tube scaled on both faces................. Onerocyrtus Ventral tube scaled on posterior face only......... Carocyrtus
23(20). Mucronal basal spine simple................................ 24 Mucronal basal spine with spinelet (fig.12)........ Setogaster
Fig.12.
24(23). First antennal segment and femur not scaled................ 25 First antennal segment and femur scaled............ Dahlcyrtus
25(24). Mouthparts not projecting........................ Cinctocyrtus Mouthparts projecting, labrum (fig.13a), labium (fig.13b) and mandibles (fig.13c) elongate.................. Rhynchocyrtus
Fig.13.
26(17). Manubrium with distal thick blunt macrochaetae (fig.14)....... ........................................... Lepidocyrtoides Manubrium without distal thick blunt macrochaetae.......... 27
Fig.14.
27(26). Colour of body scales all dark brown; dens scaled on only basal half......................................... Vietsira Colour of body scales some hyaline; dens scaled for most of ventral surface.................................. Lepidosira
28(16). Scales brown; antenna with apical bulb.......... Acanthocyrtus Scales hyaline; antenna without apical bulb...... Acanthurella
29(10). Dens with scales........................................ Seira Dens without scales........................................ 30
30(29). Mucronal basal spine absent (fig.5a)................ Desertia Mucronal basal spine present (fig.5b)............ Drepanosira
31(2). Head with 6 + 6 or fewer eyes.............................. 32 Head with 8 + 8 eyes....................................... 33
32(31). Furca with bidentate mucro (fig.15c).................. Sinella Furca with falcate mucro (fig.15a).................. Coecobrya
Fig.15.
33(31). Mucro bidentate (fig.15c).................................. 34 Mucro falcate (fig.15a&b).................................. 39
34(33). Intersegmental membranes with many microsetae (fig.16)........ ............................................... Marginobrya Intersegmental membranes without microsetae................ 35
Fig.16.
35(34). Dental spines absent....................................... 36 Dental spines present at basis (fig.17)............... Homidia
Fig.17.
36(35). Body setae flattened, scale like (fig.18).......... Himalanura Body setae not flattened................................... 37
Fig.18.
37(36). Antenna usually with apical bulb; inner tibiotarsal setae with all setae similar (fig.19b).............................. 38 Antenna without apical bulb; inner tibiotarsal setae with some setae apparently much more finely ciliate than others (fig.19a).................................... Entomobryoides
Fig.19.
38(37). Mucronal basal spine absent (fig.20a)............. Mesentotoma Mucronal basal spine present (fig.20b)............. Entomobrya
Fig.20.
39(33). Lasiotrichia or large macrochaetae bases absent on anterior margin of thorax............................... Prodrepanura Lasiotrichia or large macrochaetae bases present on anterior margin of thorax......................................... 40
40(39). Mucronal basal spine absent (fig.15b)...................... 41 Mucronal basal spine present (fig.15a).............. Drepanura
41(40). Claw with four inner teeth............................... Calx Claw with one or two inner teeth.................... Isotobrya
42(1). Body with scales (fig.1)................................... 43 Body without scales........................................ 50
43(42). Antennae with 5 segments (fig.21b).......................... 44 Antennae with 6 segments (fig.21a).......................... 48
Fig.21.
44(43). Scales hyaline and fusiform (fig.1a) absent from antennae and furcula........................................ Mastigoceras Scales strongly and apically rounded or truncate (fig.1b) present on antennae and furcula.......................... 45
45(44). Fourth antennal segment clearly annulate (fig.22).............. ............................................. Verhoeffiella Fourth antennal segment not annulate....................... 46
Fig.22.
46(45). First abdominal segment with at least 1 + 1 macrochaetae (fig.23).................................................. 47 First abdominal segment without macrochaetae...... Heteromurus
Fig.23.
47(46). Dental spines absent.......................... Heteromurtrella Dental spines present (fig.24)...................... Alloscopus
Fig.24.
48(43). Fully developed scales fusiform (fig.1a)..... Dicranorchesella Fully developed scales rounded or truncate (fig.1b)........ 49
49(48). Prelabral setae bifurcate (fig.25)........ Pseudodicranocentrus Prelabral setae not bifurcate.................. Dicranocentrus
Fig.25.
50(42). Postantennal organ absent.................................. 51 Postantennal organ rudimentary (fig.26)..................... 55
Fig.26.
51(50). Head with 2 + 2 or fewer eyes.............................. 52 Head with 7 + 7 or more eyes............................... 53
52(51). Mucro with strong anteapical tooth (fig.27b)...... Neorchesella Mucro with very weak anteapical tooth (fig.27a).... Bessoniella
Fig.27.
53(51). Second antennal segment not subsegmented (fig.21b&c)........ 54 Second antennal segment subsegmented (fig.21a)...... Orchesella
54(53). First antennal segment not subdivided (fig.21c).... Corynothrix First antennal segment subdivided (fig.21b)...... Orchesellides
55(50). Mucro bidentate (fig.28b)...................... Australotomurus Mucro falcate (fig.28a)..................................... 56
Fig.28.
56(55). Unguis with three longitudinal ridges............. Hispanobrya Unguis without longitudinal ridges......................... 57
57(56). Postantennal organ 15 times 5 micron, narrowed in its inner side.............................................. Nothobrya Postantennal organ less than 4 micron across simple and flat.. ................................................... Capbrya

http://www.collembola.org/key/entoidae.htm - Last updated on 2009.09.30 by Frans Janssens

Rationale

Key

References