http://www.collembola.org/key/paroidae.htm - Last updated on 2017.04.30 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.

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.


Differential diagnoses

Akabosia
Base of mucro with enlarged scale or bladder like appendage (fig.3). Dens crenulate (fig.5b). Mucro well developed. 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.14b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Callyntrura
Antennae longer or equal than half the length of trunk. Dens without spines. Genal and occipital areas of head with 1 or no macrochaetae (fig.19c). 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.14a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Trunk facies not fusiform. Vertex with macrochaetae (fig.19b&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 4 times as long or more than greatest width. Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Dicranocentroides
Antennae longer or equal than half the length of trunk. Dens without spines. Genal and occipital areas of head with 3 macrochaetae (fig.19b). 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.14a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Trunk facies not fusiform. Vertex with macrochaetae (fig.19b&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
Base of mucro without appendage. Dens with a dorsal row of stout serrated spines (fig.8). Mucro well developed. Mucro with 2 teeth (fig.7c). Mucro not falcate (fig.3&7). Scales absent.

Glacialoca 1
Antennal segments 1 & 2 with macrochaetae much shorter than segment length. Head with 8 + 8 eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.14a). Mucro with 2 teeth (fig.7c). Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

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

Lepidonella
Antennae longer or equal than half the length of trunk. Dens without spines. 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.14a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Trunk facies not fusiform. Vertex without macrochaetae (fig.19a).

Metacoelura
Mucro well developed. Mucro falcate (fig.2b). Scales absent.

Parachaetoceras
Antennal segments 1 & 2 with macrochaetae at least 2/3 as long as segment (fig.15). Head with 8 + 8 eyes. Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.14a). Mucro with 2 teeth (fig.7c). Mucro sharply separated from dens (fig.11b). Scales present (fig.1).

Parachaetoceras 1
Antennal segments 1 & 2 with macrochaetae at least 2/3 as long as segment (fig.15). Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro with 2 teeth (fig.7c). Mucro 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. Mucro not falcate (fig.3&7). Scales absent. Vertex of head with at least 6 + 6 macrochaetae (fig.4a&b).

Paronella
Antennae shorter than half the length of trunk (fig.18). Dens with two rows of very strong, sclerotised spines (fig.17). Head with 8 + 8 eyes. Manubrium with short smooth spines (fig.16). Mesothorax not humped (fig.10b). Metathorax not strongly bent. Mucro 1.5 times as long as basal width (fig.14a). Mucro with 3 or more teeth (fig.7a&b). Mucro sharply separated from dens (fig.11b). Scales present (fig.1). Trunk facies fusiform Entomobrya-like (fig.18).

Paronellides
Base of mucro without appendage. Dens without serrated spines. Mucro well developed. 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.15). 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. 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. 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. Mucro not falcate (fig.3&7). Scales absent. Vertex of head with 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 3 times as long or less than greatest width. Mucro sharply separated from dens (fig.11b). 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