Checklist of the Collembola: Key to the families of Onychiuroidea | ![]() |
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). Abdomen with lateral projections (fig.1).... Pachytullbergiidae Abdomen without lateral projections........................... 2 |
|
![]() |
|
2(1). Anterio-median part of fifth abdominal tergum with a glandular opening (fig.2); prothoracic tergum with papillae but no setae (fig.3)................................ Isotogastruridae Anterio-median part of fifth abdominal tergum without a glandular opening; prothoracic tergum with setae but no papillae.................................................... 3 |
|
![]() |
|
![]() |
|
3(2). Sense organ of third antennal segment complex with at least six elements, 4-5 outer papillae and 1-3 inner sense structures (fig.4a)......................................... Onychiuridae Sense organ of third antennal segment with at most two or three protective papillae and two inner sensory structures (fig.4b), or with the organ divided into a dorsal and ventral section, each bearing more than 2 structures......................... 4 |
|
![]() |
|
4(3). Pseudocelli absent............................................ 5 Pseudocelli present, at least on antennal base (fig.5) and/or or dorsum of fifth abdominal segment............... Tullbergiidae |
|
![]() |
|
5(4). Anal spines 3: bilateral pair and extra middorsal terminal spine; clothing plurichaetomic; sixth abdominal segment seta a0 present..................... Triacanthellidae:Triacanthella 1 Anal spines never 3; clothing paucichaetomic; sixth abdominal segment seta a0 absent........................... Odontellidae |
Endnotes
1 Monogenic family Triacanthellidae nom. nov. (type genus =Triacanthella) with tentative status (infered from D'Haese, 2002, 2003; Greenslade & al., 2011).
Isotogastruridae
Abdomen without lateral projections.
Anterio-median part of fifth abdominal tergum with a glandular opening
(fig.2). Prothoracic tergum with papillae but no setae (fig.3).
Odontellidae
Abdomen without lateral projections. Anal spines
never 3. Anterio-median part of fifth abdominal tergum without a glandular
opening. Clothing paucichaetomic. Prothoracic tergum with setae but no
papillae. Pseudocelli absent. Sense organ of third antennal segment with at
most two or three protective papillae and two inner sensory structures
(fig.4b), or with the organ divided into a dorsal and ventral section, each
bearing more than 2 structures. Sixth abdominal segment seta a0 absent.
Onychiuridae
Abdomen without lateral projections. Anterio-median
part of fifth abdominal tergum without a glandular opening. Prothoracic tergum
with setae but no papillae. Sense organ of third antennal segment complex with
at least six elements, 45 outer papillae and 13 inner sense
structures (fig.4a).
Pachytullbergiidae
Abdomen with lateral projections (fig.1).
Triacanthellidae:Triacanthella 1
Abdomen without lateral
projections. Anal spines 3: bilateral pair and extra middorsal terminal spine.
Anterio-median part of fifth abdominal tergum without a glandular opening.
Clothing plurichaetomic. Prothoracic tergum with setae but no papillae.
Pseudocelli absent. Sense organ of third antennal segment with at most two or
three protective papillae and two inner sensory structures (fig.4b), or with
the organ divided into a dorsal and ventral section, each bearing more than 2
structures. Sixth abdominal segment seta a0 present.
Tullbergiidae
Abdomen without lateral projections.
Anterio-median part of fifth abdominal tergum without a glandular opening.
Prothoracic tergum with setae but no papillae. Pseudocelli present, at least
on antennal base (fig.5) and/or or dorsum of fifth abdominal segment. Sense
organ of third antennal segment with at most two or three protective papillae
and two inner sensory structures (fig.4b), or with the organ divided into a
dorsal and ventral section, each bearing more than 2 structures.