http://www.collembola.org/key/spinacta.htm - Last updated on 2022.05.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Spinactaletes

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

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). Body dark blue or purple.......................... venezuelensis
      Body dark grey, green, or brown............................... 2
 

2(1). Adult males with metatibiotarsal spur (fig.1a-c); unguiculus of
        metathoracic leg with internal margin concave (fig.2b)..... 3
      Adult males without metatibiotarsal spur; unguiculus of
        metathoracic leg with internal margin convex (fig.2a)........
         ..................................................... nemyops

Fig.1.
  

Fig.2.
   
3(2). Sclerotized process of metatibiotarsal spur inserted subapically
        on papilla (fig.3c)........................................ 4
      Sclerotized process sp of metatibiotarsal spur inserted apically
        on papilla pa (fig.3a-b)................................... 9

Fig.3.
   
4(3). Sclerotized process flat in side view (fig.4b) or cylindrical
        (fig.1a).................................................... 5
      Sclerotized process with three keels (fig.4a)...... myoptesimus

Fig.4.
   
5(4). Sclerotized process not triangular............................ 6
      Sclerotized process triangular (fig.1c) (fig.4b)............. 8
 

6(5). Sclerotized process cylindrical (fig.1a).......... campylorachis
      Sclerotized process laterally flattened (fig.5a-b)........... 7

Fig.5.
   
7(6). Sclerotized process apically rounded, with one tooth on lower
        margin (fig.5a); second antennal segment setae pl1, pl2, and
        b', when present acuminate (fig.6a); metathoracic unguis
        without inner teeth................................ bellingeri
      Sclerotized process truncate and toothless (fig.5b); second
        antennal segment setae pl1, pl2, and b' bothriotrichum-like
        (fig.6b); metathoracic unguis with one inner tooth.. aebianus

Fig.6.
   
8(5). Sclerotized process toothless (fig.4b)............... calcarius
      Sclerotized process with two teeth on ventral margin (fig.1c)...
         .................................................... deltalus
 

9(3). Sclerotized process of tibiotarsal spur shorter than papilla;
        seta w1 subequal to seta w2 (fig.3a).................. boneti
      Sclerotized process of tibiotarsal spur subequal to papilla;
        seta w1 longer than w2 (fig.3b)................ calcalectoris

Endnotes

1 Except for S. venezuelensis, the key works only for adult male specimens.

References