http://www.collembola.org/key/anarmatu.htm - Last updated on 2009.09.30 by Frans Janssens

Checklist of the Collembola: Key to the species of Anarmatus

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, Zoological Institute, University of Kiel, 24098 Kiel, Germany
Frans Janssens, Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium

Rationale

Key

1(0). Claws with distinct inner tooth; empodial filaments relatively
        thick; formula of anterior setae of dens 3 + 1, 2, 1, 1 - 1;
        third antennal segment with 28 or 30 setae.................. 2
      Claws with minute inner tooth; empodial filaments relatively
        thin; formula of anterior setae of dens 3 + 1, 2, 1 - 1; third
        antennal segment with 25 setae........................ taizzus
 
2(1). Body with asymmetrical dark spots; third antennal segment with
        28 setae......................................... irregularius
      Body without or with symmetrical spots; third antennal segment
        with 30 setae............................................... 3
 
3(2). Body with only little faint pigment; first tibiotarsus with
        about 7 long outer setae; third tibiotarsus with 5-6 long
        outer setae........................................ longisetus
      Body with small or large black spots; first tibiotarsus without
        outer setae; third tibiotarsus with 2-3 long outer setae.... 4
 
4(3). Second tibiotarsus row p with 3, seldom 4, setae; anterior and
        dorsal parts of large abdomen with large black spots..........
         .................................................. diksamanus
      Second tibiotarsus row p with 4 setae; anterior and dorsal parts
        of large abdomen with small black spots............ goeehensis

Differential diagnoses

diksamanus
Anterior and dorsal parts of large abdomen with large black spots. Body without or with symmetrical spots. Body with small or large black spots. Claws with distinct inner tooth. Empodial filaments relatively thick. First tibiotarsus without outer setae. Formula of anterior setae of dens 3 + 1, 2, 1, 1 – 1. Second tibiotarsus row p with 3, seldom 4, setae. Third antennal segment with 28 or 30 setae. Third antennal segment with 30 setae. Third tibiotarsus with 2–3 long outer setae.

goeehensis
Anterior and dorsal parts of large abdomen with small black spots. Body without or with symmetrical spots. Body with small or large black spots. Claws with distinct inner tooth. Empodial filaments relatively thick. First tibiotarsus without outer setae. Formula of anterior setae of dens 3 + 1, 2, 1, 1 – 1. Second tibiotarsus row p with 4 setae. Third antennal segment with 28 or 30 setae. Third antennal segment with 30 setae. Third tibiotarsus with 2–3 long outer setae.

irregularius
Body with asymmetrical dark spots. Claws with distinct inner tooth. Empodial filaments relatively thick. Formula of anterior setae of dens 3 + 1, 2, 1, 1 – 1. Third antennal segment with 28 or 30 setae. Third antennal segment with 28 setae.

longisetus
Body without or with symmetrical spots. Body with only little faint pigment. Claws with distinct inner tooth. Empodial filaments relatively thick. First tibiotarsus with about 7 long outer setae. Formula of anterior setae of dens 3 + 1, 2, 1, 1 – 1. Third antennal segment with 28 or 30 setae. Third antennal segment with 30 setae. Third tibiotarsus with 5–6 long outer setae.

taizzus
Claws with minute inner tooth. Empodial filaments relatively thin. Formula of anterior setae of dens 3 + 1, 2, 1 – 1. Third antennal segment with 25 setae.

References