http://www.collembola.org/key/acanrtus.htm - Last updated on 2009.12.21 by Frans Janssens
Checklist of the Collembola: Key to the species of Acanthocyrtus

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.

Feng Zhang, Department of Biology, Nanjing University, Nanjing 210093, China
Louis Deharveng, UMR 7205 CNRS, Origine, Structure et Evolution de la Biodiversité, Museum National d'Histoire Naturelle, Paris, France
Penelope Greenslade, School of Botany and Zoology, Australian National University, Australian Capital Territory 0200, Australia
Jian-Xiu Chen, Department of Biology, Nanjing University, Nanjing 210093, 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). Tenent hair clavate (fig.1)................................... 2
      Tenent hair pointed.................................. marginalis

Fig.1.
   
2(1). Mucronal basal spine just reaching the apex of subapical tooth
        (fig.2b).................................................... 3
      Mucronal basal spine reaching midway between subapical tooth and
        apical tooth (fig.2a)............................. barrowensis

Fig.2.
   
3(2). Antennae much shorter than body length........................ 4
      Antennae subequal to or longer than body length............... 6
 

4(3). First abdominal segment with four macrochaetae................ 5
      First abdominal segment with two macrochaetae.......... spinosus
 

5(4). Head GR.I with four macrochaetae and four sutural macrochaetae S
        (fig.3b)........................................... loftyensis
      Head GR.I with two macrochaetae and three sutural macrochaetae S
        (fig.3a).............................................. yolngui

Fig.3.
   
6(3). Fourth antennal segment annulated, apical bulb present (fig.4)..
         .................................................... lineatus
      Fourth antennal segment not annulated, apical bulb absent..... 7

Fig.4.
   
7(6). Femora completely pigmented......................... guianiensis
      Femora distal portion only pigmented.................... croceus

Differential diagnoses

barrowensis
Mucronal basal spine reaching midway between subapical tooth and apical tooth (fig.2a). Tenent hair clavate (fig.1).

croceus
Antennae subequal to or longer than body length. Femora distal portion only pigmented. Fourth antennal segment not annulated, apical bulb absent. Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

guianiensis
Antennae subequal to or longer than body length. Femora completely pigmented. Fourth antennal segment not annulated, apical bulb absent. Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

lineatus
Antennae subequal to or longer than body length. Fourth antennal segment annulated, apical bulb present (fig.4). Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

loftyensis
Antennae much shorter than body length. First abdominal segment with four macrochaetae. Head GR.I with four macrochaetae and four sutural macrochaetae S (fig.3b). Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

marginalis
Tenent hair pointed.

spinosus
Antennae much shorter than body length. First abdominal segment with two macrochaetae. Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

yolngui
Antennae much shorter than body length. First abdominal segment with four macrochaetae. Head GR.I with two macrochaetae and three sutural macrochaetae S (fig.3a). Mucronal basal spine just reaching the apex of subapical tooth (fig.2b). Tenent hair clavate (fig.1).

References