Checklist of the Collembola: Key to the families of Hypogastruroidea | ![]() |
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.
Kenneth A. Christiansen,
Department of Biology, Grinnell College, PO Box V3, Grinnell, IA 50112-0806, USA
Frans Janssens,
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
1(0). Sense organ of third antennal segment complex with at least six elements, 4-5 outer papillae and 1-3 inner sense structures (fig.1a)...................................... Hypogastruridae 1 Sense organ of third antennal segment with at most two or three protective papillae and two inner sensory structures (fig.1b), or with the organ divided into a dorsal and ventral section, each bearing more than 2 structures......................... 2 |
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2(1). Eyes absent, furcula or trace absent, unguiculi absent........ 3 Eyes present, furcula or trace present.......... Hypogastruridae 2 |
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3(2). Postantennal organ absent; abdomen semi-ovoid; sixth abdominal segment shorter than fifth (fig.2a).......... Hypogastruridae 3 Postantennal organ minute; abdomen cylindrical; sixth abdominal segment longer than fifth (fig.2b)........ Paleotullbergiidae |
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Endnotes
1 Acherongia will key out here.
2 ad partem.
3 ad partem.
Hypogastruridae 1
Sense organ of third antennal segment
complex with at least six elements, 45 outer papillae and 13 inner
sense structures (fig.1a).
Hypogastruridae 2
Eyes present, furcula or trace present.
Sense organ of third antennal segment with at most two or three protective
papillae and two inner sensory structures (fig.1b), or with the organ divided
into a dorsal and ventral section, each bearing more than 2 structures.
Hypogastruridae 3
Abdomen semi-ovoid. Eyes absent, furcula
or trace absent, unguiculi absent. Postantennal organ minute - about 4.6 micra
- or absent. Postantennal organ absent. Sense organ of third antennal segment
with at most two or three protective papillae and two inner sensory structures
(fig.1b), or with the organ divided into a dorsal and ventral section, each
bearing more than 2 structures. Sixth abdominal segment shorter than fifth
(fig.2a).
Paleotullbergiidae
Abdomen cylindrical. Eyes absent, furcula or
trace absent, unguiculi absent. Postantennal organ minute - about 4.6 micra -
or absent. Postantennal organ minute. Sense organ of third antennal segment
with at most two or three protective papillae and two inner sensory structures
(fig.1b), or with the organ divided into a dorsal and ventral section, each
bearing more than 2 structures. Sixth abdominal segment longer than fifth
(fig.2b).