http://www.collembola.org/key/homidiaj.htm - Last updated on 2010.12.28 by Frans Janssens
Checklist of the Collembola: Key to the species of Homidia from Japan

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.

Rafael Jordana, Department of Zoology and Ecology, University of Navarra, 31080, Pamplona, Navarra, Spain
Enrique Baquero, Department of Zoology and Ecology, University of Navarra, 31080, Pamplona, Navarra, 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).   Second thoracic segment to third abdominal segment entirely
          white or yellowish................................. rosannae
        Second thoracic segment to third abdominal segment with some
          colour patches or dark pigment............................ 2
 
2(1).   Third thoracic segment to fourth abdominal segment not totally
          dark, but with some coloured pattern or without pigment in
          some segment.............................................. 3
        Third thoracic segment to fourth abdominal segment totally
          dark, with or without posterior darker band.............. 10
 
3(2).   First abdominal segment with dark pigment................... 4
        First abdominal segment without dark pigment, only ground
          colour.................................................... 7
 
4(3).   First abdominal segment with lateral bands.................. 5
        First abdominal segment with posterior transversal stripe.....
           ..................................................... munda
 
5(4).   Third abdominal segment completely dark and lateral darker
          bands............................................. fujiyamai
        Third abdominal segment only with lateral bands............. 6
 
6(5).   A4 on third abdominal segment with 1 macrochaeta........ sotoi
        A4 on third abdominal segment with 3 macrochaetae....... socia
 
7(3).   T1 on second thoracic segment not with 4-4 macrochaetae
          respectively.............................................. 8
        T1 on second thoracic segment with 4-4 macrochaetae
          respectively........................................ sauteri
 
8(7).   T1 on second thoracic segment not with 5-5 macrochaetae
          respectively.............................................. 9
        T1 on second thoracic segment with 5-5 macrochaetae
          respectively........................................ yoshiii
 
9(8).   Third abdominal segment with 0-1-1 macrochaetae on A2-A3
          areas............................................ subcingula
        Third abdominal segment with 0-2-2 macrochaetae on A2-A3
          areas........................................... chrysothrix
 
10(2).  Second thoracic segment entirely pigmented.... amethystinoides
        Second thoracic segment with an anterior-lateral band and a
          posterior transversal stripe, head dark coloured............
           .............................................. nigrocephala

Differential diagnoses

amethystinoides
Second thoracic segment entirely pigmented. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third thoracic segment to fourth abdominal segment totally dark, with or without posterior darker band.

chrysothrix
T1 on second thoracic segment not with 4–4 macrochaetae respectively. T1 on second thoracic segment not with 5–5 macrochaetae respectively. First abdominal segment without dark pigment, only ground colour. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third abdominal segment with 0–2–2 macrochaetae on A2-A3 areas. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

fujiyamai
First abdominal segment with dark pigment. First abdominal segment with lateral bands. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third abdominal segment completely dark and lateral darker bands. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

munda
First abdominal segment with dark pigment. First abdominal segment with posterior transversal stripe. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

nigrocephala
Second thoracic segment with an anterior-lateral band and a posterior transversal stripe, head dark coloured. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third thoracic segment to fourth abdominal segment totally dark, with or without posterior darker band.

rosannae
Second thoracic segment to third abdominal segment entirely white or yellowish.

sauteri
T1 on second thoracic segment with 4–4 macrochaetae respectively. First abdominal segment without dark pigment, only ground colour. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

socia
A4 on third abdominal segment with 3 macrochaetae. First abdominal segment with dark pigment. First abdominal segment with lateral bands. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third abdominal segment only with lateral bands. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

sotoi
A4 on third abdominal segment with 1 macrochaeta. First abdominal segment with dark pigment. First abdominal segment with lateral bands. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third abdominal segment only with lateral bands. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

subcingula
T1 on second thoracic segment not with 4–4 macrochaetae respectively. T1 on second thoracic segment not with 5–5 macrochaetae respectively. First abdominal segment without dark pigment, only ground colour. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third abdominal segment with 0–1–1 macrochaetae on A2-A3 areas. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

yoshiii
T1 on second thoracic segment not with 4–4 macrochaetae respectively. T1 on second thoracic segment with 5–5 macrochaetae respectively. First abdominal segment without dark pigment, only ground colour. Second thoracic segment to third abdominal segment with some colour patches or dark pigment. Third thoracic segment to fourth abdominal segment not totally dark, but with some coloured pattern or without pigment in some segment.

References