http://www.collembola.org/key/alloopus.htm - Last updated on 2014.02.28 by Frans Janssens
Checklist of the Collembola: Key to the species of Alloscopus

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.

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). Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5..... 2
      Head seta m1 placed far back from a3, distance m1-a3/a3-a0>2.6..
         ................................................. tenuicornis
 
2(1). Second thoracic segment with 4 pm macrochaetae................ 3
      Second thoracic segment with 5 pm macrochaetae................ 4
 
3(2). L1 ciliated; labium with 2-4 scales; lateral anal valve each
        with 0-1 smooth setae; head macrochaeta m3 absent; tibiotarsi
        without smooth setae.............................. tenuicornis 1
      L1 smooth; labium with 0-1 scale; lateral anal valve each with 2
        smooth setae; head macrochaeta m3 present; tibiotarsi at inner
        margin with 2 longitudinal rows of smooth setae.. tetracanthus
 
4(2). Dens with 27-55 spines arranged in 2 rows; third thoracic
        segment with 7 setae............................ multispinatus
      Dens with 3-5 spines arranged in 1 row; third thoracic segment
        with 6 setae................................................ 5
 
5(4). Outer pair of labral papillae not strongly conelike; tibiotarsi
        without smooth setae........................................ 6
      Outer pair of labral papillae strongly conelike; tibiotarsi with
        several rows of smooth setae....................... deharvengi
 
6(5). Outer pair of labral papillae rounded, with small lateral
        conelike projections............................ thailandensis
      Outer pair of labral papillae rounded, without small lateral
        conelike projections................................. strebeli

Endnotes

1 Heteromurus (Alloscopus) yosiius Mari Mutt, 1985:336-341 n.sp., synonymised with Heteromurus (Alloscopus) tenuicornis by Yoshii & Suhardjono (as Yayuk(sic)), 1989:64-67.

Differential diagnoses

deharvengi
Dens with 3–5 spines arranged in 1 row. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. Outer pair of labral papillae strongly conelike. Second thoracic segment with 5 pm macrochaetae. Third thoracic segment with 6 setae. Tibiotarsi with several rows of smooth setae.

multispinatus
Dens with 27–55 spines arranged in 2 rows. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. Second thoracic segment with 5 pm macrochaetae. Third thoracic segment with 7 setae.

strebeli
Dens with 3–5 spines arranged in 1 row. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. Outer pair of labral papillae not strongly conelike. Outer pair of labral papillae rounded, without small lateral conelike projections. Second thoracic segment with 5 pm macrochaetae. Third thoracic segment with 6 setae. Tibiotarsi without smooth setae.

tenuicornis
Head seta m1 placed far back from a3, distance m1-a3/a3-a0>2.6.

tenuicornis 1
Head macrochaeta m3 absent. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. L1 ciliated. Labium with 2–4 scales. Lateral anal valve each with 0–1 smooth setae. Second thoracic segment with 4 pm macrochaetae. Tibiotarsi without smooth setae.

tetracanthus
Head macrochaeta m3 present. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. L1 smooth. Labium with 0–1 scale. Lateral anal valve each with 2 smooth setae. Second thoracic segment with 4 pm macrochaetae. Tibiotarsi at inner margin with 2 longitudinal rows of smooth setae.

thailandensis
Dens with 3–5 spines arranged in 1 row. Head seta m1 placed close to a3, distance m1-a3/a3-a0<2.5. Outer pair of labral papillae not strongly conelike. Outer pair of labral papillae rounded, with small lateral conelike projections. Second thoracic segment with 5 pm macrochaetae. Third thoracic segment with 6 setae. Tibiotarsi without smooth setae.

References