Checklist of the Collembola: Key to the species of Typhlogastrura, partim North America |
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
Hanghang Wang,
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). Eyes 0 + 0 or 1 + 1........................................... 2 Eyes at least 3 + 3........................................... 3 2(1). Fourth antennal segment with seven blunt, thick setae........... .................................................. elsarzolae Fourth antennal segment with ten blunt, thick setae. veracruzana 3(1). Fifth abdominal segment with a clear median swelling (fig.3).... ....................................................... unica Fifth abdominal segment without a clear median swelling....... 4 4(3). Fifth abdominal segment with three-four setae between the p1 setae level (fig.4a).............................. alabamensis Fifth abdominal segment with two setae between the p1 setae level (fig.4b).............................................. 5 5(4). Apical antennal bulb large and double (fig.5a)....... steinmanni Apical antennal bulb small and single, sometimes apically indented (fig.5b)........................................... 6 6(5). Fifth abdominal segment with seta p2 and/or p4 absent......... 7 Fifth abdominal segment with setae p1-p5 all present (fig.2).. 9 7(6). B/a ratio on second thoracic segment greater than 3.0 (fig.6b).. ........................................................... 8 B/a ratio on second thoracic segment less than 1.8 (fig.6a)..... ................................................. asymmetrica 8(7). Fifth abdominal segment with both setae p2 and p4 (fig.2) absent.......................................... christianseni Fifth abdominal segment with seta p4 present.......... valentini 9(6). Eyes 4 + 4.......................................... fousheensis Eyes 5 + 5 or 6 + 6..................................... helleri