http://www.collembola.org/key/pseurida.htm - Last updated on 2024.05.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Pseudanurida

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

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). Claw with appressed tooth more distal in position or without;
        dens with 6 setae; dorsal lobe of sixth abdominal segment
        without ventral setae; epipharynx apically cleft; fifth
        abdominal segment with a ventral single row................. 2
      Claw with strong basal tooth; dens with 12 setae; dorsal lobe of
        sixth abdominal segment with many ventral setae; epipharynx
        square-ended; fifth abdominal segment with many ventral setae
        before the genital field........................ billitonensis
 
2(1). Head with strongly differentiated macrochaetae; sixth abdominal
        segment with many setae on dorsal valve, including median
        unpaired setae in the anterior and posterior rows; ventral
        tube without setae on the valves............... bogoyawlenskyi
      Head without strongly differentiated macrochaetae; sixth
        abdominal segment with 3 + 3 dorsal setae, median unpaired
        setae absent; ventral tube with 1 + 1 setae placed far
        anteriorly on the valves.................................... 3
 
3(2). Mucro with posterior lamella supported by a toothlike strut;
        sixth abdominal segment tapered cylindrical, without
        differentiation into dorsal and lateral anal valves, although
        the corresponding seta tracts are clearly distinguishable;
        tegumental bleeding sites present on head, first abdominal
        segment and fourth abdominal segment; tenaculum with both
        anterior and posterior lobes of corpus elevated beyond rami...
         ........................................................ yini
      Mucro without supporting strut on posterior lamella; sixth
        abdominal segment with dorsal and ventral anal valves clearly
        separated by indentations; tegumental bleeding sites not
        differentiated; tenaculum with only the anterior lobe
        elevated.................................................... 4
 
4(3). Setae p2 on fifth abdominal segment and p3 on first to third
        abdominal segment more than 2 times length of other setae;
        general body setae short; third antennal segment and fourth
        antennal segment short and compact; males with sixth abdominal
        segment as in female................................. sawayana
      Setae p2 on fifth abdominal segment and p3 on first to third
        abdominal segment not longer then other setae; general body
        setae strong; third antennal segment and fourth antennal
        segment elongate in adult; males with sixth abdominal segment
        greatly elongate..................................... glauerti


References