http://www.collembola.org/key/entoinae.htm - Last updated on 2020.06.30 by Frans Janssens
Checklist of the Collembola: Key to the genera of Entomobryinae

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
Nikolas Gioia Cipola, Laboratório de Sistemática e Ecologia de Invertebrados do Solo, Instituto Nacional de Pesquisas da Amazônia, CEP 69011-970, Manaus, Brazil
José Wellington de Morais, Laboratório de Sistemática e Ecologia de Invertebrados do Solo, Instituto Nacional de Pesquisas da Amazônia, CEP 69011-970, Manaus, Brazil
Bruno Cavalcante Bellini, Centro de Biociências, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, Brazil
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).   Body scales absent; dental spines absent.................... 2
        Body scales present 2; dental spines present (fig.1)........ 14

Fig.1.
   
2(1).   Head with 6 + 6 or fewer eyes............................... 3
        Head with 8 + 8 eyes........................................ 4
 

3(2).   Furca with bidentate mucro (fig.2c).................. Sinella
        Furca with falcate mucro (fig.2a).................. Coecobrya

Fig.2.
   
4(2).   First antennal segment not subdivided....................... 5
        First antennal segment subdivided................. Mesentotoma
 

5(4).   Mucro bidentate (fig.2c)................................... 6
        Mucro falcate (fig.2a&b).................................. 11
 

6(5).   Intersegmental membranes with many microsetae (fig.3)........
           ............................................... Marginobrya
        Intersegmental membranes without microsetae................. 7

Fig.3.
   
7(6).   Dental spines absent........................................ 8
        Dental spines present at basis (fig.4)............... Homidia

Fig.4.
   
8(7).   Body setae flattened, scale like (fig.5).......... Himalanura
        Body setae not flattened.................................... 9

Fig.5.
   
9(8).   Antenna usually with apical bulb; inner tibiotarsal setae with
          all setae similar (fig.6b).............................. 10
        Antenna without apical bulb; inner tibiotarsal setae with some
          setae apparently much more finely ciliate than others
          (fig.6a).................................... Entomobryoides

Fig.6.
   
10(9).  Mucronal basal spine absent (fig.7a)............. Mesentotoma 1
        Mucronal basal spine present (fig.7b)............. Entomobrya

Fig.7.
   
11(5).  Lasiotrichia or large macrochaetae bases absent on anterior
          margin of thorax............................... Prodrepanura
        Lasiotrichia or large macrochaetae bases present on anterior
          margin of thorax......................................... 12
 

12(11). Mucronal basal spine absent (fig.2b)...................... 13
        Mucronal basal spine present (fig.2a).............. Drepanura
 

13(12). Claw with four inner teeth............................... Calx
        Claw with one or two inner teeth.................... Isotobrya
 

14(1).  Dental scales absent....................................... 15
        Dental scales present........................... Acanthocyrtus
 

15(14). Anterior central region of fourth abdominal segment with one
          transverse row of macrochaetae; prelabral chaetae smooth
          simple; ventral cephalic groove without scale-like chaetae..
           ................................................ Sinhomidia
        Anterior central region of fourth abdominal segment with two
          transverse rows of macrochaetae; prelabral chaetae bifurcate
          (fig.8); ventral cephalic groove with scale-like chaetae
          (fig.9)....................................... Amazhomidia

Fig.8.
  

Fig.9.
  

Endnotes

1 Mesentotoma specimens without subdivided first antennal segment.

2 The scaled Entomobryinae of the Lepidosira-group : Epimetrura, Lepidocyrtoides, and Lepidosira are conservatively placed in Willowiinae.

Differential diagnoses

Acanthocyrtus
Body scales present$note2. Dental scales present. Dental spines present (fig.1).

Amazhomidia
Anterior central region of fourth abdominal segment with two transverse rows of macrochaetae. Body scales present$note2. Dental scales absent. Dental spines present (fig.1). Prelabral chaetae bifurcate (fig.8). Ventral cephalic groove with scale-like chaetae (fig.9).

Calx
Body scales absent. Claw with four inner teeth. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Lasiotrichia or large macrochaetae bases present on anterior margin of thorax. Mucro falcate (fig.2a&b). Mucronal basal spine absent (fig.2b).

Coecobrya
Body scales absent. Dental spines absent. Furca with falcate mucro (fig.2a). Head with 6 + 6 or fewer eyes.

Drepanura
Body scales absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Lasiotrichia or large macrochaetae bases present on anterior margin of thorax. Mucro falcate (fig.2a&b). Mucronal basal spine present (fig.2a).

Entomobrya
Antenna usually with apical bulb. Body scales absent. Body setae not flattened. Dental spines absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Inner tibiotarsal setae with all setae similar (fig.6b). Intersegmental membranes without microsetae. Mucro bidentate (fig.2c). Mucronal basal spine present (fig.7b).

Entomobryoides
Antenna without apical bulb. Body scales absent. Body setae not flattened. Dental spines absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Inner tibiotarsal setae with some setae apparently much more finely ciliate than others (fig.6a). Intersegmental membranes without microsetae. Mucro bidentate (fig.2c).

Himalanura
Body scales absent. Body setae flattened, scale like (fig.5). Dental spines absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Intersegmental membranes without microsetae. Mucro bidentate (fig.2c).

Homidia
Body scales absent. Dental spines absent. Dental spines present at basis (fig.4). First antennal segment not subdivided. Head with 8 + 8 eyes. Intersegmental membranes without microsetae. Mucro bidentate (fig.2c).

Isotobrya
Body scales absent. Claw with one or two inner teeth. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Lasiotrichia or large macrochaetae bases present on anterior margin of thorax. Mucro falcate (fig.2a&b). Mucronal basal spine absent (fig.2b).

Marginobrya
Body scales absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Intersegmental membranes with many microsetae (fig.3). Mucro bidentate (fig.2c).

Mesentotoma
Body scales absent. Dental spines absent. First antennal segment subdivided. Head with 8 + 8 eyes.

Mesentotoma 1
Antenna usually with apical bulb. Body scales absent. Body setae not flattened. Dental spines absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Inner tibiotarsal setae with all setae similar (fig.6b). Intersegmental membranes without microsetae. Mucro bidentate (fig.2c). Mucronal basal spine absent (fig.7a).

Prodrepanura
Body scales absent. Dental spines absent. First antennal segment not subdivided. Head with 8 + 8 eyes. Lasiotrichia or large macrochaetae bases absent on anterior margin of thorax. Mucro falcate (fig.2a&b).

Sinella
Body scales absent. Dental spines absent. Furca with bidentate mucro (fig.2c). Head with 6 + 6 or fewer eyes.

Sinhomidia
Anterior central region of fourth abdominal segment with one transverse row of macrochaetae. Body scales present$note2. Dental scales absent. Dental spines present (fig.1). Prelabral chaetae smooth simple. Ventral cephalic groove without scale-like chaetae.

References