http://www.collembola.org/key/katiidae.htm - Last updated on 2017.03.31 by Frans Janssens
Checklist of the Collembola: Key to the genera of Katiannidae

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.

Gerhard Bretfeld, Staatliches Museum für Naturkunde, Görlitz, Germany
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).   Head with thickened or long setae........................... 2
        Head without thickened or long setae........................ 4
 
2(1).   Fourth antennal segment not divided; retinaculum with 3 + 3
          teeth; third antennal segment without papilla (fig.1).....
           .............................................. Vesicephalus
        Fourth antennal segment subdivided or annulate; retinaculum
          with 4 + 4 teeth; third antennal segment with papilla..... 3
 

Fig.1.
 
3(2).   Sixth abdominal segment in female with acuminate seta a0;
          ventral head-back without spur..................... Katianna
        Sixth abdominal segment in female with furcate seta a0;
          ventral head-back with spur (fig.2)........... Neokatianna
 

Fig.2.
 
4(1).   Bothriotrichum B absent; bothriotrichum C absent; fourth
          antennal segment as long as third antennal segment or
          shorter; bothriotrichum A absent; setae of large abdomen in
          doublets (fig.3)................................ Papirinus
        Bothriotrichum B present; bothriotrichum C present; fourth
          antennal segment longer than third antennal segment;
          bothriotrichum A present; setae of large abdomen in
          singlets.................................................. 5
 

Fig.3.
 
5(4).   Head and mouthparts elongate (fig.4)........ Stenognathellus
        Head and mouthparts not elongate............................ 6
 

Fig.4.
 
6(5).   Male with hump on second thoracic segment to third thoracic
          segment........................................... Zebulonia
        Male without hump on second thoracic segment to third thoracic
          segment................................................... 7
 
7(6).   Sixth abdominal segment in female with acuminate seta a0.... 8
        Sixth abdominal segment in female with furcate seta a0..... 15
 
8(7).   Large abdomen with small spines anteriorly; lateral cuticular
          protuberances present on large abdomen (fig.5)............
           .............................................. Parakatianna
        Large abdomen without small spines; lateral cuticular
          protuberances absent on large abdomen..................... 9
 

Fig.5.
 
9(8).   Tibiotarsus basally with distinct pores (fig.6).. Rusekianna
        Tibiotarsus without pores.................................. 10
 

Fig.6.
 
10(9).  Bothriotrichum D not on large papilla...................... 11
        Bothriotrichum D short, on large papilla (fig.7)......... 14
 

Fig.7.
 
11(10). Fourth antennal segment subsegmented....................... 12
        Fourth antennal segment undivided.................. Gisinianus
 
12(11). Fourth antennal segment obliquely subsegmented (fig.8)......
           .................................................. Dalianus
        Fourth antennal segment transversely subsegmented.......... 13
 

Fig.8.
 
13(12). Sacs of ventral tube smooth; tibiotarsus with less than 10
          spatulate setae................................ Polykatianna
        Sacs of ventral tube warty; tibiotarsus with 10-11 spatulate
          setae............................................. Millsurus
 
14(10). Sacs of ventral tube smooth; fourth antennal segment
          transversely subsegmented.................... Pseudokatianna
        Sacs of ventral tube warty; fourth antennal segment obliquely
          subsegmented (fig.9)........................... Katiannina
 

Fig.9.
 
15(7).  Neosminthuroid setae absent; sacs of ventral tube warty; third
          antennal segment without papilla............... Betschurinus
        Neosminthuroid setae present; sacs of ventral tube smooth;
          third antennal segment with papilla............ Sminthurinus


Differential diagnoses

Betschurinus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Sacs of ventral tube warty. Setae of large abdomen in singlets. Sixth abdominal segment in female with furcate seta a0. Third antennal segment without papilla.

Dalianus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D not on large papilla. Fourth antennal segment subsegmented. Fourth antennal segment obliquely subsegmented (fig.8). Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores.

Gisinianus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D not on large papilla. Fourth antennal segment undivided. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores.

Katianna
Fourth antennal segment subdivided or annulate. Head with thickened or long setae. Retinaculum with 4 + 4 teeth. Sixth abdominal segment in female with acuminate seta a0. Third antennal segment with papilla. Ventral head-back without spur.

Katiannina
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D short, on large papilla (fig.7). Fourth antennal segment obliquely subsegmented (fig.9). Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Sacs of ventral tube warty. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores.

Millsurus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D not on large papilla. Fourth antennal segment subsegmented. Fourth antennal segment transversely subsegmented. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Sacs of ventral tube warty. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores. Tibiotarsus with 10–11 spatulate setae.

Neokatianna
Fourth antennal segment subdivided or annulate. Head with thickened or long setae. Retinaculum with 4 + 4 teeth. Sixth abdominal segment in female with furcate seta a0. Third antennal segment with papilla. Ventral head-back with spur (fig.2).

Papirinus
Bothriotrichum A absent. Bothriotrichum B absent. Bothriotrichum C absent. Fourth antennal segment as long as third antennal segment or shorter. Head without thickened or long setae. Setae of large abdomen in doublets (fig.3).

Parakatianna
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen with small spines anteriorly. Lateral cuticular protuberances present on large abdomen (fig.5). Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0.

Polykatianna
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D not on large papilla. Fourth antennal segment subsegmented. Fourth antennal segment transversely subsegmented. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Sacs of ventral tube smooth. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores. Tibiotarsus with less than 10 spatulate setae.

Pseudokatianna
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Bothriotrichum D short, on large papilla (fig.7). Fourth antennal segment transversely subsegmented. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Sacs of ventral tube smooth. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus without pores.

Rusekianna
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Large abdomen without small spines. Lateral cuticular protuberances absent on large abdomen. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae absent. Setae of large abdomen in singlets. Sixth abdominal segment in female with acuminate seta a0. Tibiotarsus basally with distinct pores (fig.6).

Sminthurinus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Male without hump on second thoracic segment to third thoracic segment. Neosminthuroid setae present. Sacs of ventral tube smooth. Setae of large abdomen in singlets. Sixth abdominal segment in female with furcate seta a0. Third antennal segment with papilla.

Stenognathellus
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts elongate (fig.4). Setae of large abdomen in singlets.

Vesicephalus
Fourth antennal segment not divided. Head with thickened or long setae. Retinaculum with 3 + 3 teeth. Third antennal segment without papilla (fig.1).

Zebulonia
Bothriotrichum A present. Bothriotrichum B present. Bothriotrichum C present. Dorsal glandular bosse present in male. Fourth antennal segment longer than third antennal segment. Head without thickened or long setae. Head and mouthparts not elongate. Male with hump on second thoracic segment to third thoracic segment. Setae of large abdomen in singlets.


References