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

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, Laboratorio de Ecologia y Sistemática de Microartrópodos, Departamento de Ecologia y Recursos Naturales, Facultad de Ciensas, UNAM, México D.F.
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). Maxillae quadrangular with 8 apical teeth.......... micropilosus
      Maxillae triangular without apical teeth...................... 2
 
2(1). Postantennal organ with 4 vesicles................... compositus
      Postantennal organ with more then 4 vesicles.................. 3
 
3(2). Maxillae with two internal lobes; postantennal organ with 8
        vesicles; three internal dental setae ciliated... navarinensis
      Maxillae without internal lobes; postantennal organ with 13 to
        17 vesicles; three internal dental setae smooth.... neuquensis

Differential diagnoses

compositus
Maxillae triangular without apical teeth. Postantennal organ with 4 vesicles.

micropilosus
Maxillae quadrangular with 8 apical teeth.

navarinensis
Maxillae triangular without apical teeth. Maxillae with two internal lobes. Postantennal organ with more then 4 vesicles. Postantennal organ with 8 vesicles. Three internal dental setae ciliated.

neuquensis
Maxillae triangular without apical teeth. Maxillae without internal lobes. Postantennal organ with more then 4 vesicles. Postantennal organ with 13 to 17 vesicles. Three internal dental setae smooth.


References