http://www.collembola.org/key/paroidae.htm - Last updated on 2024.10.31 by Frans Janssens
Checklist of the Collembola: Key to the genera of Paronellinae

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.

Peter F. Bellinger (), Department of Biology, California State University, Northridge, CA 91330, USA
Kenneth A. Christiansen, Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
Penelope Greenslade, Biosecurity Australia, Barton, ACT 2601, Australia
Saral K. Mitra, Zoological Survey of India, Calcutta, West Bengal, India
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

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).   Scales absent............................................... 2
        Scales present (fig.1)..................................... 10

Fig.1.
   
2(1).   Mucro absent or vestigial (fig.2a)..................... Yosiia
        Mucro well developed........................................ 3

Fig.2.
   
3(2).   Mucro falcate (fig.2b)............................ Metacoelura
        Mucro not falcate (fig.3&7)................................. 4

Fig.3.
   
4(3).   Base of mucro with enlarged scale or bladder like appendage
          (fig.3)................................................... 5
        Base of mucro without appendage............................. 8
 

5(4).   Vertex of head with 2 + 2 macrochaetae (fig.4c&d)........... 6
        Vertex of head with at least 6 + 6 macrochaetae (fig.4a&b).. 7

Fig.4.
   
6(5).   Dens crenulate (fig.5b).............................. Akabosia
        Dens straight and smooth (fig.5a)...................... Salina

Fig.5.
   
7(5).   Dentes with spines (fig.6)........................... Paronana
        Dentes without spines............................ Pseudosalina

Fig.6.
   
8(4).   Mucro with 2 teeth (fig.7c)................................. 9
        Mucro with 3 teeth (fig.7a)................ Pseudoparonellides

Fig.7.
   
9(8).   Dens with a dorsal row of stout serrated spines (fig.8).......
           ................................................ Glacialoca
        Dens without serrated spines..................... Paronellides

Fig.8.
   
10(1).  Metathorax not strongly bent............................... 11
        Metathorax strongly bent so as to point mesothorax downwards
          (fig.9)....................................... Campylothorax

Fig.9.
   
11(10). Mesothorax not humped (fig.10b)............................ 12
        Mesothorax sharply humped (fig.10a)................. Idiomerus

Fig.10.
   
12(11). Mucro sharply separated from dens (fig.11b)................ 13
        Mucro weakly separated from dens (fig.11a)................. 24

Fig.11.
   
13(12). Head with 6 + 6 or fewer eyes.............................. 14
        Head with 8 + 8 eyes....................................... 18
 

14(13). Body with clear pigment pattern, 6 + 6 eyes................ 15
        Body without pigment or with diffuse pigment, 6 + 6 or fewer
          eyes..................................................... 16
 

15(14). Unguiculus acuminate (fig.12b)................ Dicranocentruga
        Unguiculus excavate (fig.12a)..................... Trichorypha

Fig.12.
   
16(14). Fourth antennal segment not divided in halves (fig.13a).... 17
        Fourth antennal segment subdivided into two halves (fig.13b)..
           ............................................. Troglopedetes

Fig.13.
   
17(16). Mucro 3 times as long or less than greatest width.............
           .............................................. Trogalophysa
        Mucro 4 times as long or more than greatest width.............
           ............................................. Cyphoderopsis
 

18(13). Mucro 1.5 times as long as basal width (fig.14a)........... 19
        Mucro subequal in length to basal width (fig.14b).............
           .............................................. Bromacanthus

Fig.14.
   
19(18). Mucro with 2 teeth (fig.7c)................................ 20
        Mucro with 3 or more teeth (fig.7a&b)...................... 21
 

20(19). Antennal segments 1 & 2 with macrochaetae at least 2/3 as long
          as segment (fig.15)......................... Parachaetoceras
        Antennal segments 1 & 2 with macrochaetae much shorter than
          segment length................................... Glacialoca 1

Fig.15.
   
21(19). Manubrium with short smooth spines (fig.16); dens with two
          rows of very strong, sclerotised spines (fig.17); antennae
          shorter than half the length of trunk (fig.18); trunk facies
          fusiform Entomobrya-like (fig.18)................. Paronella
        Manubrium without spines; dens without spines; antennae longer
          or equal than half the length of trunk; trunk facies not
          fusiform................................................. 22

Fig.16.
  

Fig.17.
  

Fig.18.
   
22(21). Vertex with macrochaetae (fig.19b&c)....................... 23
        Vertex without macrochaetae (fig.19a)............. Lepidonella

Fig.19.
   
23(22). Genal and occipital areas of head with 1 or no macrochaetae
          (fig.19c)....................................... Callyntrura
        Genal and occipital areas of head with 3 macrochaetae
          (fig.19b)................................. Dicranocentroides
 

24(12). Antennal segments 1 & 2 with macrochaetae at least 2/3 as long
          as segment (fig.15)...................................... 25
        Antennal segments 1 & 2 with macrochaetae much shorter than
          segment length.............................. Pseudoparonella
 

25(24). Mucro with 2 teeth (fig.7c)................... Parachaetoceras 1
        Mucro with 3 teeth (fig.7b)...................... Plumachaetas

Endnotes

1 Due to infraspecific variation of characters, the species keys out twice.

References