http://www.collembola.org/key/tomoidae.htm - Last updated on 2009.09.30 by Frans Janssens
Checklist of the Collembola: Key to the genera of Tomoceridae

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).   Mucro shape elongate with 3 or more teeth projecting dorsally
          (fig.1a).................................................. 2
        Mucro shape short falcate or with only distal teeth
          (fig.1b&c)............................................... 11

Fig.1.
   
2(1).   Mucro basally with 1 tooth (fig.2a)......................... 3
        Mucro basally with 2 teeth, sometimes far apart (fig.2b&c).. 4

Fig.2.
   
3(2).   Third antennal segment 3 or more times as long as fourth......
           ............................................ Monodontocerus
        Third antennal segment less than 2 times as long as fourth....
           ................................................. Novacerus
 

4(2).   Base of dentes with 1 or more large lateral outer macrochaetae
          (fig.3)................................................... 5
        Base of dentes without large lateral outer macrochaetae..... 7

Fig.3.
   
5(4).   Clear trochanteral organ present on femur and trochanter
          (fig.4b)......................................... Plutomurus
        Clear trochanteral organ present only on femur (fig.4a)..... 6

Fig.4.
   
6(5).   Tenent hair acuminate, 1 + 1 outer dental macrochaetae........
           ................................................. Tomolonus
        Tenent hair clavate, 2 + 2 or more outer dental macrochaetae..
           .............................................. Aphaenomurus
 

7(4).   Eyes absent or vestigial.................................... 8
        Eyes present and well developed............................. 9
 

8(7).   Trochanteral organ absent.......................... Tritomurus
        Trochanteral organ present on trochanter and femur (fig.4b)...
           ................................................ Lethemurus
 

9(7).   Dens with an inner swollen spine like scale (fig.5)...........
           .......................................... Pogonognathellus
        Dens without an inner swollen spine like scale............. 10

Fig.5.
   
10(9).  Toothlet on basal dental tooth of mucro absent (fig.6b).......
           ................................................ Tomocerina
        Toothlet on basal dental tooth of mucro present (fig.6a)......
           ................................................. Tomocerus

Fig.6.
   
11(1).  Mucro falcate (fig.1c)..................................... 12
        Mucro with 3-4 distal teeth (fig.1b)....................... 15
 

12(11). Third antennal segment much shorter than fourth (fig.7).......
           ............................................. Antennacyrtus
        Third antennal segment slightly shorter to longer than fourth.
           ........................................................ 13

Fig.7.
   
13(12). Mesothorax not projecting far over head (fig.8b)........... 14
        Mesothorax projecting far over head (fig.8a)..................
           ...................................... Pseudolepidophorella

Fig.8.
   
14(13). Scales absent......................................... Millsia
        Scales present................................. Lepidophorella
 

15(11). Head with small postantennal organ (fig.9)......... Lasofinius
        Head without postantennal organ................... Neophorella

Fig.9.
  

Differential diagnoses

Antennacyrtus
Mucro falcate (fig.1c). Mucro shape short falcate or with only distal teeth (fig.1b&c). Third antennal segment much shorter than fourth (fig.7).

Aphaenomurus
Base of dentes with 1 or more large lateral outer macrochaetae (fig.3). Clear trochanteral organ present only on femur (fig.4a). Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Tenent hair clavate, 2 + 2 or more outer dental macrochaetae.

Lasofinius
Head with small postantennal organ (fig.9). Mucro with 3–4 distal teeth (fig.1b). Mucro shape short falcate or with only distal teeth (fig.1b&c). Setae some plumose.

Lepidophorella
Mesothorax not projecting far over head (fig.8b). Mucro falcate (fig.1c). Mucro shape short falcate or with only distal teeth (fig.1b&c). Scales present. Third antennal segment slightly shorter to longer than fourth.

Lethemurus
Base of dentes without large lateral outer macrochaetae. Eyes absent or vestigial. Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Trochanteral organ present on trochanter and femur (fig.4b).

Millsia
Mesothorax not projecting far over head (fig.8b). Mucro falcate (fig.1c). Mucro shape short falcate or with only distal teeth (fig.1b&c). Scales absent. Third antennal segment slightly shorter to longer than fourth.

Monodontocerus
Mucro basally with 1 tooth (fig.2a). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Third antennal segment 3 or more times as long as fourth.

Neophorella
Head without postantennal organ. Mucro with 3–4 distal teeth (fig.1b). Mucro shape short falcate or with only distal teeth (fig.1b&c). Setae all smooth.

Novacerus
Mucro basally with 1 tooth (fig.2a). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Third antennal segment less than 2 times as long as fourth.

Plutomurus
Base of dentes with 1 or more large lateral outer macrochaetae (fig.3). Clear trochanteral organ present on femur and trochanter (fig.4b). Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a).

Pogonognathellus
Base of dentes without large lateral outer macrochaetae. Dens with an inner swollen spine like scale (fig.5). Eyes present and well developed. Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a).

Pseudolepidophorella
Mesothorax projecting far over head (fig.8a). Mucro falcate (fig.1c). Mucro shape short falcate or with only distal teeth (fig.1b&c). Third antennal segment slightly shorter to longer than fourth.

Tomocerina
Base of dentes without large lateral outer macrochaetae. Dens without an inner swollen spine like scale. Eyes present and well developed. Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Toothlet on basal dental tooth of mucro absent (fig.6b).

Tomocerus
Base of dentes without large lateral outer macrochaetae. Dens without an inner swollen spine like scale. Eyes present and well developed. Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Toothlet on basal dental tooth of mucro present (fig.6a).

Tomolonus
Base of dentes with 1 or more large lateral outer macrochaetae (fig.3). Clear trochanteral organ present only on femur (fig.4a). Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Tenent hair acuminate, 1 + 1 outer dental macrochaetae.

Tritomurus
Base of dentes without large lateral outer macrochaetae. Eyes absent or vestigial. Mucro basally with 2 teeth, sometimes far apart (fig.2b&c). Mucro shape elongate with 3 or more teeth projecting dorsally (fig.1a). Trochanteral organ absent.

References