http://www.collembola.org/key/homidia.htm - Last updated on 2019.11.30 by Frans Janssens
Checklist of the Collembola: Key to the species of Homidia from China

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.

Shao-Bo Jia, School of Life Sciences, Liaocheng University, Liaocheng 252059, Shandong Province, China
Yu-Ping Zhang, School of Life Sciences, Liaocheng University, Liaocheng 252059, Shandong Province, China
Yan Zhao, School of Life Sciences, Liaocheng University, Liaocheng 252059, Shandong Province, China
Rafael Jordana, Department of Zoology and Ecology, University of Navarra, 31080, Pamplona, Navarra, Spain
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

H#-, T#- and A#-areas defined by Jordana & Baquero (2005).
Number of macrochaetae per half tergum.

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).   Second abdominal segment with 2 macrochaetae on A1, second
          abdominal segment with 3 macrochaetae on A2, third abdominal
          segment with 1 macrochaeta on A3.................... sauteri
        Second abdominal segment with 2 macrochaetae on A1, second
          abdominal segment with 4 macrochaetae on A2, third abdominal
          segment with 1 macrochaeta on A3.......................... 2
 
2(1).   Third abdominal segment not with 0, 0, 1 macrochaetae on A3,
          A4, and A5................................................ 3
        Third abdominal segment with 0, 0, 1 macrochaetae on A3, A4,
          and A5................................................... 20
 
3(2).   A4 on third abdominal segment with 1 macrochaeta............ 4
        A4 on third abdominal segment with more than 1 macrochaeta. 18
 
4(3).   T1 on second thoracic segment with 3 macrochaetae........... 5
        T1 on second thoracic segment with 4 macrochaetae.......... 10
 
5(4).   T2 on second thoracic segment with 2 macrochaetae.. anhuiensis
        T2 on second thoracic segment with more than 2 macrochaetae. 6
 
6(5).   T2 on second thoracic segment with 3 macrochaetae.............
           .............................................. tiantaiensis
        T2 on second thoracic segment with more than 3 macrochaetae. 7
 
7(6).   T2 on second thoracic segment with 4 macrochaetae........... 8
        T2 on second thoracic segment with 5 macrochaetae........... 9
 
8(7).   H1 on head with 3 macrochaetae; A9-A10 on fourth abdominal
          segment with 2 and 3 macrochaetae respectively......... leei
        H1 on head with 5 macrochaetae; A9-A10 on fourth abdominal
          segment with 1 and 1 macrochaetae respectively... tibetensis
 
9(7).   A9-A10 on fourth abdominal segment with 3 and 3 macrochaetae
          respectively...................................... latifolia
        A9-A10 on fourth abdominal segment with 7 and 13 (15)
          macrochaetae respectively.......................... polyseta
 
10(4).  T2 on second thoracic segment with 4 macrochaetae.......... 11
        T2 on second thoracic segment with 5 or 6 macrochaetae..... 13
 
11(10). Fourth abdominal segment with 11 + 11 dorsal macrochaetae,
          formula A6-A10: 0-7-0-0-4....................... transitoria
        Fourth abdominal segment with more than 11 + 11 dorsal
          macrochaetae............................................. 12
 
12(11). A9-A10 on fourth abdominal segment with 2 and 5 macrochaetae
          respectively......................................... fascia
        A9-A10 on fourth abdominal segment with 5 and 3 macrochaetae
          respectively..................................... qimenensis
 
13(10). T2 on second thoracic segment with 5 macrochaetae.......... 14
        T2 on second thoracic segment with 6 macrochaetae. linhaiensis
 
14(13). A9 on fourth abdominal segment with 1 macrochaeta; H3
          macrochaeta present on the head................... apigmenta
        A9 on fourth abdominal segment with more than 1 macrochaeta;
          H3 macrochaeta absent on the head........................ 15
 
15(14). Fourth abdominal segment with 4 macrochaetae............... 16
        Fourth abdominal segment with 8 or 9 macrochaetae on a10......
           ................................................ ziguiensis
 
16(15). Dens with 88-114 spines.......................... huashanensis
        Dens with less than 80 spines.............................. 17
 
17(16). Dens with 17-38 spines.......................... phjongjangica
        Dens with 29-41 spines............................ mediofascia 1
 
18(3).  A3-A5 on third abdominal segment with 0, 2, 1 macrochaetae. 19
        A3-A5 on third abdominal segment with 0, 3, 0 macrochaetae....
           ..................................................... socia
 
19(18). T1-T2 on second thoracic segment with 2 and 4 macrochaetae
          respectively.................................... pentachaeta
        T1-T2 on second thoracic segment with 4 and 5 macrochaetae
          respectively....................................... sinensis
 
20(2).  A10 on fourth abdominal segment with 3 (2) macrochaetae.......
           .............................................. sichuanensis
        A10 on fourth abdominal segment with 4 (5) macrochaetae.... 21
 
21(20). A8 on fourth abdominal segment with 1 and 1 macrochaeta.......
           ................................................. formosana
        A8 on fourth abdominal segment without macrochaetae. emeiensis

Endnotes

1 Homidia mediofascia is probably a synonym of H. phjongjangica, the only character separating them is colour: a diffuse medial longitudinal band on Th. III to Abd. III is present in H. mediofascia, whereas H. phjongianica is described as having broad color variation that includes that pattern in the type series studied after Szeptycki's collection.

Differential diagnoses

anhuiensis
A4 on third abdominal segment with 1 macrochaeta. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with 2 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

apigmenta
A4 on third abdominal segment with 1 macrochaeta. A9 on fourth abdominal segment with 1 macrochaeta. H3 macrochaeta present on the head. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

emeiensis
A10 on fourth abdominal segment with 4 (5) macrochaetae. A8 on fourth abdominal segment without macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment with 0, 0, 1 macrochaetae on A3, A4, and A5.

fascia
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 2 and 5 macrochaetae respectively. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 4 macrochaetae. Fourth abdominal segment with more than 11 + 11 dorsal macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

formosana
A10 on fourth abdominal segment with 4 (5) macrochaetae. A8 on fourth abdominal segment with 1 and 1 macrochaeta. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment with 0, 0, 1 macrochaetae on A3, A4, and A5.

huashanensis
A4 on third abdominal segment with 1 macrochaeta. A9 on fourth abdominal segment with more than 1 macrochaeta. H3 macrochaeta absent on the head. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Dens with 88–114 spines. Fourth abdominal segment with 4 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

latifolia
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 3 and 3 macrochaetae respectively. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with more than 2 macrochaetae. T2 on second thoracic segment with more than 3 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

leei
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 2 and 3 macrochaetae respectively. H1 on head with 3 macrochaetae. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with more than 2 macrochaetae. T2 on second thoracic segment with more than 3 macrochaetae. T2 on second thoracic segment with 4 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

linhaiensis
A4 on third abdominal segment with 1 macrochaeta. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 6 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

mediofascia 1
A4 on third abdominal segment with 1 macrochaeta. A9 on fourth abdominal segment with more than 1 macrochaeta. H3 macrochaeta absent on the head. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Dens with less than 80 spines. Dens with 29–41 spines. Fourth abdominal segment with 4 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

pentachaeta
A3-A5 on third abdominal segment with 0, 2, 1 macrochaetae. A4 on third abdominal segment with more than 1 macrochaeta. T1-T2 on second thoracic segment with 2 and 4 macrochaetae respectively. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

phjongjangica
A4 on third abdominal segment with 1 macrochaeta. A9 on fourth abdominal segment with more than 1 macrochaeta. H3 macrochaeta absent on the head. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Dens with less than 80 spines. Dens with 17–38 spines. Fourth abdominal segment with 4 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

polyseta
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 7 and 13 (15) macrochaetae respectively. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with more than 2 macrochaetae. T2 on second thoracic segment with more than 3 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

qimenensis
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 5 and 3 macrochaetae respectively. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 4 macrochaetae. Fourth abdominal segment with more than 11 + 11 dorsal macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

sauteri
Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 3 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3.

sichuanensis
A10 on fourth abdominal segment with 3 (2) macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment with 0, 0, 1 macrochaetae on A3, A4, and A5.

sinensis
A3-A5 on third abdominal segment with 0, 2, 1 macrochaetae. A4 on third abdominal segment with more than 1 macrochaeta. T1-T2 on second thoracic segment with 4 and 5 macrochaetae respectively. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

socia
A3-A5 on third abdominal segment with 0, 3, 0 macrochaetae. A4 on third abdominal segment with more than 1 macrochaeta. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

tiantaiensis
A4 on third abdominal segment with 1 macrochaeta. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with more than 2 macrochaetae. T2 on second thoracic segment with 3 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

tibetensis
A4 on third abdominal segment with 1 macrochaeta. A9-A10 on fourth abdominal segment with 1 and 1 macrochaetae respectively. H1 on head with 5 macrochaetae. T1 on second thoracic segment with 3 macrochaetae. T2 on second thoracic segment with more than 2 macrochaetae. T2 on second thoracic segment with more than 3 macrochaetae. T2 on second thoracic segment with 4 macrochaetae. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

transitoria
A4 on third abdominal segment with 1 macrochaeta. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 4 macrochaetae. Fourth abdominal segment with 11 + 11 dorsal macrochaetae, formula A6-A10: 0–7–0–0–4. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

ziguiensis
A4 on third abdominal segment with 1 macrochaeta. A9 on fourth abdominal segment with more than 1 macrochaeta. H3 macrochaeta absent on the head. T1 on second thoracic segment with 4 macrochaetae. T2 on second thoracic segment with 5 or 6 macrochaetae. T2 on second thoracic segment with 5 macrochaetae. Fourth abdominal segment with 8 or 9 macrochaetae on a10. Second abdominal segment with 2 macrochaetae on A1, second abdominal segment with 4 macrochaetae on A2, third abdominal segment with 1 macrochaeta on A3. Third abdominal segment not with 0, 0, 1 macrochaetae on A3, A4, and A5.

References