http://www.collembola.org/key/chornula.htm - Last updated on 2017.10.31 by Frans Janssens
Checklist of the Collembola: Key to the species of Choreutinula

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.

José G. Palacios-Vargas, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
Gabriela Castaño-Meneses, Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciensas, UNAM, 04510 México D.F.
Yang Gao, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Shanghai 200032, China.
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). Dens with four posterior setae; diameter of postantennal organ
        about the size of closest eye; tibiotarsi with two clavate
        tenent hairs................................................ 2
      Dens with six posterior setae; diameter of postantennal organ
        only one third of closest eye; tibiotarsi each with one
        clavate tenent hair.................................... alpina
 
2(1). Ventral tube with 6 + 6 to 8 + 8 setae............... gauquelini
      Ventral tube with fewer than 6 + 6 setae...................... 3
 
3(2). Ventral tube with 4 + 4 setae................................. 4
      Ventral tube with 5 + 5 setae........................... inermis
 
4(3). Unguiculus a minute bristle; body about 1.6 mm long....... yinae
      Unguiculus absent; body 1.2 mm long........................... 5
 
5(4). Setae p3 on fourth abdominal segment of similar size than p1 and
        p2...................................................... kulla
      Setae p3 on fourth abdominal segment one third as long as of p1
        and p2.............................................. americana

Endnotes

1 Choreutinula nodiseta is not included in the key because the brief description is insufficient for its recognition.


Differential diagnoses

alpina
Dens with six posterior setae. Diameter of postantennal organ only one third of closest eye. Tibiotarsi each with one clavate tenent hair.

americana
Body 1.2 mm long. Dens with four posterior setae. Diameter of postantennal organ about the size of closest eye. Setae p3 on fourth abdominal segment one third as long as of p1 and p2. Tibiotarsi with two clavate tenent hairs. Unguiculus absent. Ventral tube with fewer than 6 + 6 setae. Ventral tube with 4 + 4 setae.

gauquelini
Dens with four posterior setae. Diameter of postantennal organ about the size of closest eye. Tibiotarsi with two clavate tenent hairs. Ventral tube with 6 + 6 to 8 + 8 setae.

inermis
Dens with four posterior setae. Diameter of postantennal organ about the size of closest eye. Tibiotarsi with two clavate tenent hairs. Ventral tube with fewer than 6 + 6 setae. Ventral tube with 5 + 5 setae.

kulla
Body 1.2 mm long. Dens with four posterior setae. Diameter of postantennal organ about the size of closest eye. Setae p3 on fourth abdominal segment of similar size than p1 and p2. Tibiotarsi with two clavate tenent hairs. Unguiculus absent. Ventral tube with fewer than 6 + 6 setae. Ventral tube with 4 + 4 setae.

yinae
Body about 1.6 mm long. Dens with four posterior setae. Diameter of postantennal organ about the size of closest eye. Tibiotarsi with two clavate tenent hairs. Unguiculus a minute bristle. Ventral tube with fewer than 6 + 6 setae. Ventral tube with 4 + 4 setae.


References