http://www.collembola.org/key/paroidae.htm - Last updated on 2009.09.30 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.

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 (fig.2b, 3&7).......................... 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)................. 25

Fig.11.
   
13(12). Head with 6 + 6 or fewer eyes.............................. 14
        Head with 8 + 8 eyes....................................... 19
 

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.......... 18
 

18(17). Mucro serrate on only basal half (fig.14b)...... Cyphoderopsis
        Mucro serrate on whole dorsal edge (fig.14a)....... Troglobius

Fig.14.
   
19(13). Mucro 1.5 times as long as basal width (fig.15a)........... 20
        Mucro subequal in length to basal width (fig.15b).............
           .............................................. Bromacanthus

Fig.15.
   
20(19). Mucro with 2 teeth (fig.7c)................................ 21
        Mucro with 3 or more teeth (fig.7a&b)...................... 22
 

21(20). Antennal segments 1 & 2 with macrochaetae at least 2/3 as long
          as segment (fig.16)......................... Parachaetoceras
        Antennal segments 1 & 2 with macrochaetae much shorter than
          segment length................................... Glacialoca

Fig.16.
   
22(20). Manubrium with short smooth spines (fig.17)......... Paronella
        Manubrium without spines................................... 23

Fig.17.
   
23(22). Vertex with macrochaetae (fig.18b&c)....................... 24
        Vertex without macrochaetae (fig.18a)............. Lepidonella

Fig.18.
   
24(23). Genal and occipital areas of head with 1 or no macrochaetae
          (fig.18c)....................................... Callyntrura
        Genal and occipital areas of head with 3 macrochaetae
          (fig.18b)................................. Dicranocentroides
 

25(12). Antennal segments 1 & 2 with macrochaetae at least 2/3 as long
          as segment (fig.16)...................................... 26
        Antennal segments 1 & 2 with macrochaetae much shorter than
          segment length.............................. Pseudoparonella
 

26(25). Mucro with 2 teeth (fig.7c)................... Parachaetoceras
        Mucro with 3 teeth (fig.7b)...................... Plumachaetas

Differential diagnoses

Akabosia
Base of mucro with enlarged scale or bladder like appendage (fig.3). Dens crenulate (fig.5b). Mucro well developed (fig.2b, fig.3&7). Mucro not falcate (fig.3&7). Scales absent. Vertex of head with 2 + 2 macrochaetae (fig.4c&d).

Bromacanthus
Head with 8 + 8 eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro subequal in length to basal width (fig.15b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Callyntrura
Genal and occipital areas of head with 1 or no macrochaetae (fig.18c). Head with 8 + 8 eyes. Manubrium without spines. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Vertex with macrochaetae (fig.18b&c).

Campylothorax
Metathorax strongly bent so as to point mesothorax downwards (fig.9). Scales present (fig.1).

Cyphoderopsis
Body without pigment or with diffuse pigment, 6 + fig.6 or fewer eyes. Fourth antennal segment not divided in halves (fig.13a). Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Mucro 4 times as long or more than greatest width. Mucro serrate on only basal half (fig.14b). Scales present (fig.1).

Dicranocentroides
Genal and occipital areas of head with 3 macrochaetae (fig.18b). Head with 8 + 8 eyes. Manubrium without spines. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Vertex with macrochaetae (fig.18b&c).

Dicranocentruga
Body with clear pigment pattern, 6 + 6 eyes. Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Unguiculus acuminate (fig.12b).

Glacialoca
Antennal segments 1 & 2 with macrochaetae much shorter than segment length. Base of mucro without appendage. Dens with a dorsal row of stout serrated spines (fig.8). Head with 8 + 8 eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro well developed (fig.2b, 3&7). Mucro with 2 teeth (fig.7c). Mucro with 2 teeth (fig.7c). Mucro sharply separated from dens (fig.11b). Mucro not falcate (fig.3&7). Scales absent, or present (fig.1).

Idiomerus
Mesothorax sharply humped (fig.10a). Metathorax not strongly bent. Scales present (fig.1).

Lepidonella
Head with 8 + 8 eyes. Manubrium without spines. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Vertex without macrochaetae (fig.18a).

Metacoelura
Mucro well developed (fig.2b, 3&7). Mucro falcate (fig.2b). Scales absent.

Parachaetoceras
Antennal segments 1 & 2 with macrochaetae at least 2/3 as long as segment (fig.16). Antennal segments 1 & 2 with macrochaetae at least 2/3 as long as segment (fig.16). Head with 8 + 8 eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro with 2 teeth (fig.7c). Mucro with 2 teeth (fig.7c). Mucro sharply separated from dens (fig.11b), or weakly separated from dens (fig.11a). Scales present (fig.1).

Paronana
Base of mucro with enlarged scale or bladder like appendage (fig.3). Dentes with spines (fig.6). Mucro well developed (fig.2b, fig.3&7). Mucro not falcate (fig.3&7). Scales absent. Vertex of head with at least fig.6 + 6 macrochaetae (fig.4a&b).

Paronella
Head with 8 + 8 eyes. Manubrium with short smooth spines (fig.17). Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.15a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Paronellides
Base of mucro without appendage. Dens without serrated spines. Mucro well developed (fig.2b, 3&7). Mucro with 2 teeth (fig.7c). Mucro not falcate (fig.3&7). Scales absent.

Plumachaetas
Antennal segments 1 & 2 with macrochaetae at least fig.2/3 as long as segment (fig.16). Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro with 3 teeth (fig.7b). Mucro weakly separated from dens (fig.11a). Scales present (fig.1).

Pseudoparonella
Antennal segments 1 & 2 with macrochaetae much shorter than segment length. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro weakly separated from dens (fig.11a). Scales present (fig.1).

Pseudoparonellides
Base of mucro without appendage. Mucro well developed (fig.2b, 3&7). Mucro with 3 teeth (fig.7a). Mucro not falcate (fig.3&7). Scales absent.

Pseudosalina
Base of mucro with enlarged scale or bladder like appendage (fig.3). Dentes without spines. Mucro well developed (fig.2b, 3&7). Mucro not falcate (fig.3&7). Scales absent. Vertex of head with at least 6 + 6 macrochaetae (fig.4a&b).

Salina
Base of mucro with enlarged scale or bladder like appendage (fig.3). Dens straight and smooth (fig.5a). Mucro well developed (fig.2b, 3&7). Mucro not falcate (fig.3&7). Scales absent. Vertex of head with fig.2 + 2 macrochaetae (fig.4c&d).

Trichorypha
Body with clear pigment pattern, 6 + 6 eyes. Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Unguiculus excavate (fig.12a).

Trogalophysa
Body without pigment or with diffuse pigment, 6 + 6 or fewer eyes. Fourth antennal segment not divided in halves (fig.13a). Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Mucro 3 times as long or less than greatest width. Scales present (fig.1).

Troglobius
Body without pigment or with diffuse pigment, 6 + 6 or fewer eyes. Fourth antennal segment not divided in halves (fig.13a). Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Mucro 4 times as long or more than greatest width. Mucro serrate on whole dorsal edge (fig.14a). Scales present (fig.1).

Troglopedetes
Body without pigment or with diffuse pigment, 6 + fig.6 or fewer eyes. Fourth antennal segment subdivided into two halves (fig.13b). Head with 6 + 6 or fewer eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Yosiia
Mucro absent or vestigial (fig.2a). Scales absent.

References