http://www.collembola.org/key/paroinae.htm - Last updated on 2017.06.30 by Frans Janssens
Checklist of the Collembola: Key to the tribes of Paronellinae

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.

Saral K. Mitra, Zoological Survey of India, Calcutta, West Bengal, India
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 clothed with scales...................................... 2
      Body not clothed with scales.................. Cremastocephalini
 
2(1). Body clothed with flexed macrosetae usually obliquely truncated
        type; clothed with dark pseudoscales, mostly with acuminate
        apices; gradation from ciliated setiform scale-primordia to
        scales distinctly visible; scales heavely striated and not
        distinctly pedicellate.......................... Callyntrurini
      Body not clothed with flexed macrosetae, at least of obliquely
        truncated type; clothed with hyaline or finely striated true
        or typical scales; gradation from ciliated setiform
        scale-primordia to scales not visible; scales mostly oval or
        rounded in shape, secondarily may be of other configurations
        but always with rounded apices and distinctly pedicellate... 3
 
3(2). Extra ocular structure absent................................. 4
      Extra ocular structure present...................... Paronellini
 
4(3). Ocelli 8 + 8 or reduced, arranged in two longitudinal parallel
        rows or in a circular pattern, i.e. ocellus B located almost
        centrally in each ocular field; paired inner basal tooth of
        unguis usually normal, not exaggerated, may be reduced;
        pigmentation mostly present; clothed with scales fine
        striations prominent............................ Bromacanthini
      Ocelli absent; paired inner basal tooth of unguis often
        exaggerated; pigmentation absent, sometimes faint, especially
        region near ocellar field; clothed with hyaline scales,
        striations not prominent....................... Troglopedetini

Differential diagnoses

Bromacanthini
Body clothed with scales. Body not clothed with flexed macrosetae, at least of obliquely truncated type. Clothed with hyaline or finely striated true or typical scales. Clothed with scales fine striations prominent. Extra ocular structure absent. Gradation from ciliated setiform scale-primordia to scales not visible. Ocelli 8 + 8 or reduced, arranged in two longitudinal parallel rows or in a circular pattern, i.e. ocellus B located almost centrally in each ocular field. Paired inner basal tooth of unguis usually normal, not exaggerated, may be reduced. Pigmentation mostly present. Scales mostly oval or rounded in shape, secondarily may be of other configurations but always with rounded apices and distinctly pedicellate.

Callyntrurini
Body clothed with scales. Body clothed with flexed macrosetae usually obliquely truncated type. Clothed with dark pseudoscales, mostly with acuminate apices. Gradation from ciliated setiform scale-primordia to scales distinctly visible. Scales heavely striated and not distinctly pedicellate.

Cremastocephalini
Body not clothed with scales.

Paronellini
Body clothed with scales. Body not clothed with flexed macrosetae, at least of obliquely truncated type. Clothed with hyaline or finely striated true or typical scales. Extra ocular structure present. Gradation from ciliated setiform scale-primordia to scales not visible. Scales mostly oval or rounded in shape, secondarily may be of other configurations but always with rounded apices and distinctly pedicellate.

Troglopedetini
Body clothed with scales. Body not clothed with flexed macrosetae, at least of obliquely truncated type. Clothed with hyaline or finely striated true or typical scales. Clothed with hyaline scales, striations not prominent. Extra ocular structure absent. Gradation from ciliated setiform scale-primordia to scales not visible. Ocelli absent. Paired inner basal tooth of unguis often exaggerated. Pigmentation absent, sometimes faint, especially region near ocellar field. Scales mostly oval or rounded in shape, secondarily may be of other configurations but always with rounded apices and distinctly pedicellate.


References