http://www.collembola.org/key/salina.htm - Last updated on 2017.09.30 by Frans Janssens
Checklist of the Collembola: Key to the species of Salina, partim Americas

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.

Felipe N. Soto-Adames, Illinois Natural History Survey, IL 61820, Champaign, USA
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).   Mucro rectangular, narrow, with 2 largest teeth pointing
          dorsally (fig.1a)......................................... 2
        Mucro short and square, with 3-4 teeth pointing posteriorly
          (fig.1b).................................................. 6
 

Fig.1.
 
2(1).   Second abdominal segment and fourth abdominal segment with
          dark and light blue transversal bands, respectively (fig.2);
          second thoracic segment with 4 macrosetae (fig.3)...... beta
        Second abdominal segment and fourth abdominal segment without
          transversal bands; second thoracic segment not with 4
          macrosetae 3................................................ 3
 

Fig.2.
 

Fig.3.
 
3(2).   Second thoracic segment to first abdominal segment macroseta
          formula 4, 5, 3................................. ventricolor
        Second thoracic segment to first abdominal segment macroseta
          formula not 4, 5, 3....................................... 4
 
4(3).   Posterior face of collophore with 1-2 paired setae (fig.4b);
          prelabral setae 2; first antennal segment with 2-3 dorsal
          macrosetae (fig.5b, c); fourth abdominal segment with 3
          posterior setae (fig.6b).................................. 5
        Posterior face of collophore with 3 or more setae (fig.4a);
          prelabral setae 4; first antennal segment with 4 dorsal
          macrosetae (fig.5a); fourth abdominal segment with 4 or more
          posterior setae (fig.6a)........................... thibaudi
 

Fig.4.
 

Fig.5.
 

Fig.6.
 
5(4).   Posterior face of collophore with 1 + 1 setae; chaetotaxy of
          second thoracic segment and third thoracic segment with 5 +
          5 macrosetae (fig.7a)............................. wolcotti
        Posterior face of collophore with 2 + 2 setae; chaetotaxy of
          second thoracic segment and third thoracic segment with more
          than 5 + 5 macrosetae (fig.7b)................... bidentata
 

Fig.7.
 
6(1).   Head and trunk with solid dorso-medial longitudinal band
          (fig.8)........................................... trilobata
        Head and trunk without solid dorso-medial longitudinal band. 7
 

Fig.8.
 
7(6).   Second abdominal segment with 1 external macroseta (fig.9b);
          unguiculus truncate....................................... 8
        Second abdominal segment with 2 external macrosetae (fig.9a);
          unguiculus lanceolate............................. mulcahyae
 

Fig.9.
 
8(7).   Second thoracic segment to first abdominal segment macroseta
          formula as 1, 2, 2............................... celebensis 1
        Second thoracic segment to first abdominal segment macroseta
          formula not 1, 2, 2....................................... 9
 
9(8).   Third thoracic segment to first abdominal segment number of
          macrosetae different from above.......................... 10
        Third thoracic segment to first abdominal segment with 3, 1
          macrosetae.......................................... panamae
 
10(9).  Fourth abdominal segment with 6 posterior setae; second
          thoracic segment with 8 macrosetae, 2 anterior and 6
          posterior (fig.10a)................................... banksi 2
        Fourth abdominal segment without posterior setae; second
          thoracic segment with 5-8 macrosetae, 1 or no anterior and
          5-7 posterior (fig.10b, c)................................ 11
 

Fig.10.
 
11(10). Second thoracic segment with 1 anteromedial macroseta
          displaced anteriorly and clearly separated from posterior
          row (fig.10b)....................................... tristani
        Second thoracic segment without anteromedial macrosetae all
          medial macrosetae clearly close to posterior row (fig.10c)...
           ........................................................ 12
 
12(11). Head, and abdomen greenish yellow (fig.11b)............ hermana
        Head, second thoracic segment to second abdominal segment and
          fifth abdominal segment dark blue (fig.11a).......... dedoris

Fig.11.
 


Endnotes

1 Cassagnau (1963) identified material collected in Argentina and Brazil as S. celebensis based on chaetotaxy and colour pattern. However, the colour pattern figured does not match any of the forms of S. celebensis reported in the literature.

2 Although Christiansen & Bellinger (1998) indicate that S. banski and S. decorata cannot be distinguished based on chaetotaxy, the elaborate colour pattern of S. decorata makes separation of the forms possible. Further genetic work may be needed to arbitrate between the information content of chaetotaxy and colour pattern.

3 Some individuals of S. wolcotti may have 4 macrosetae, but the colour pattern and chaetotaxy of the third abdominal segment will distinguished them from S. beta.


Differential diagnoses

banksi 2
Fourth abdominal segment with 6 posterior setae. Head and trunk without solid dorso-medial longitudinal band. Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment to first abdominal segment macroseta formula not 1, 2, 2. Second thoracic segment with fig.5 macrosetae, 2 anterior and 6 posterior (fig.10a). Third thoracic segment to first abdominal segment number of macrosetae different from above. Unguiculus truncate.

beta
Mucro rectangular, narrow, with 2 largest teeth pointing dorsally (fig.1a). Second abdominal segment and fourth abdominal segment with dark and light blue transversal bands, respectively (fig.2). Second thoracic segment with 4 macrosetae (fig.3).

bidentata
Chaetotaxy of second thoracic segment and third thoracic segment with more than 5 + 5 macrosetae (fig.7b). First antennal segment with 2–3 dorsal macrosetae (fig.5b, c). Fourth abdominal segment with 3 posterior setae (fig.6b). Mucro rectangular, narrow, with 2 largest teeth pointing dorsally (fig.1a). Posterior face of collophore with 1–2 paired setae (fig.4b). Posterior face of collophore with 2 + 2 setae. Prelabral setae 2. Second abdominal segment and fourth abdominal segment without transversal bands. Second thoracic segment not with 4 macrosetae$note3. Second thoracic segment to first abdominal segment macroseta formula not 4, 5, 3.

celebensis 1
Head and trunk without solid dorso-medial longitudinal band. Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment to first abdominal segment macroseta formula as 1, 2, 2. Unguiculus truncate.

dedoris
Fourth abdominal segment without posterior setae. Head and trunk without solid dorso-medial longitudinal band. Head, second thoracic segment to second abdominal segment and fifth abdominal segment dark blue (fig.11a). Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment without anteromedial macrosetae all medial macrosetae clearly close to posterior row (fig.10c). Second thoracic segment to first abdominal segment macroseta formula not 1, 2, 2. Second thoracic segment with 5–8 macrosetae, 1 or no anterior and 5–7 posterior (fig.10b, c). Third thoracic segment to first abdominal segment number of macrosetae different from above. Unguiculus truncate.

hermana
Fourth abdominal segment without posterior setae. Head and trunk without solid dorso-medial longitudinal band. Head, and abdomen greenish yellow (fig.11b). Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment without anteromedial macrosetae all medial macrosetae clearly close to posterior row (fig.10c). Second thoracic segment to first abdominal segment macroseta formula not 1, 2, 2. Second thoracic segment with 5–8 macrosetae, 1 or no anterior and 5–7 posterior (fig.10b, c). Third thoracic segment to first abdominal segment number of macrosetae different from above. Unguiculus truncate.

mulcahyae
Head and trunk without solid dorso-medial longitudinal band. Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 2 external macrosetae (fig.9a). Unguiculus lanceolate.

panamae
Head and trunk without solid dorso-medial longitudinal band. Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment to first abdominal segment macroseta formula not 1, 2, 2. Third thoracic segment to first abdominal segment with 3, 1 macrosetae. Unguiculus truncate.

thibaudi
First antennal segment with 4 dorsal macrosetae (fig.5a). Fourth abdominal segment with 4 or more posterior setae (fig.6a). Mucro rectangular, narrow, with 2 largest teeth pointing dorsally (fig.1a). Posterior face of collophore with 3 or more setae (fig.4a). Prelabral setae 4. Second abdominal segment and fourth abdominal segment without transversal bands. Second thoracic segment not with 4 macrosetae$note3. Second thoracic segment to first abdominal segment macroseta formula not 4, 5, 3.

trilobata
Head and trunk with solid dorso-medial longitudinal band (fig.8). Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b).

tristani
Fourth abdominal segment without posterior setae. Head and trunk without solid dorso-medial longitudinal band. Mucro short and square, with 3–4 teeth pointing posteriorly (fig.1b). Second abdominal segment with 1 external macroseta (fig.9b). Second thoracic segment with 1 anteromedial macroseta displaced anteriorly and clearly separated from posterior row (fig.10b). Second thoracic segment to first abdominal segment macroseta formula not 1, 2, 2. Second thoracic segment with 5–8 macrosetae, 1 or no anterior and 5–7 posterior (fig.10b, c). Third thoracic segment to first abdominal segment number of macrosetae different from above. Unguiculus truncate.

ventricolor
Mucro rectangular, narrow, with 2 largest teeth pointing dorsally (fig.1a). Second abdominal segment and fourth abdominal segment without transversal bands. Second thoracic segment not with 4 macrosetae$note3. Second thoracic segment to first abdominal segment macroseta formula 4, 5, 3.

wolcotti
Chaetotaxy of second thoracic segment and third thoracic segment with 5 + 5 macrosetae (fig.7a). First antennal segment with fig.8–3 dorsal macrosetae (fig.5b, c). Fourth abdominal segment with 3 posterior setae (fig.6b). Mucro rectangular, narrow, with 2 largest teeth pointing dorsally (fig.1a). Posterior face of collophore with 1–2 paired setae (fig.4b). Posterior face of collophore with 1 + 1 setae. Prelabral setae 2. Second abdominal segment and fourth abdominal segment without transversal bands. Second thoracic segment not with 4 macrosetae$note3. Second thoracic segment to first abdominal segment macroseta formula not 4, 5, 3.


References