Isotomurus

Key to species in Iran (adapted from Potapov 2001 and Fjellberg 2007).

1. Dens dorsally crenulated............................................................................... 2

- Dens dorsally tuberculated, common setae on body ciliated................................................................................ stuxbergi ( Tullberg, 1876) Distribution widely Europe, Asia, including Russia, wet habitats

2. Trichobothria absent, abdominal macrochaetae not developed.............. antennalis Bagnall, 1940 Distribution unclear.

- Trichobothria present, abdominal macrochaetae usually distinct................................................ 3

3. 4+4 basomedian setae in labium. 6+6 S chaetae on abd V subequal... cassagnaui Deharveng & Lek, 1993. France, now Asia

- At least 7+7 basomedian setae in labium. 7+7 sens on abd V, the two median of which are twice as long (Unknown for some species)............................................................................................. 4

4. Lateral chaeta on mucro present or if absent, many chaetae on ventral tube....................................... 10

- Lateral chaeta on the mucro absent....................................................................... 5

5. Colour uniformly reddish brown /blue..................................................................... 6

- Colour uniformly green or patterned...................................................................... 7

6. Abdominal macrochaetae short, smooth, Dens with sparse dorsal cover of setae, Males with modified setae in lateral part of abd.4 only............................................................ italicus Carapelli et al., 1995 Palearctic.

- Abdominal macrochaetae long, ciliate, Dens with more dorsal setae, Males with modified setae in lateral parts of abd. 3–4.......................................................................... fucicola ( Schött, 1893) Palearctic.

7. Uniformly green, clypeal edge not darkened................... graminis Fjellberg, 2007 ( Figure 3 View FIGURE 3 ) Distribution unclear.

- With longitudinal or spotted pigmented pattern, clypeal edge contrastingly dark.................................... 8

8. Dorsal pattern of pigmented longitudinal lines, bands or patches, Abd.4 without crown-like figure..................... 9

- Dorsal patches not clearly arranged in stripes, Abd.4 with a crown-like figure..................................................................................... maculatus ( Schäffer, 1896) Distribution unclear, revision needed.

9. Dorsolateral pigmented patches on thorax 2–abdomen 2 separated from dark coxal parts of legs, males without modified setae on abdomen 2–3....................................................... palustris ( Müller, 1776) Cosmopolitan.

- Body with pigmented dorsal longitudinal stripes or bands.................................................... 10

10. Trichobothrial insertions pigmented, ventral tube with 9–18 lateral distal chaetae, 20 anterior, 30 posterior, mucro with chaeta.......................................................... punctiferus Yosii, 1963 Asia ( Japan, Pakistan, Iran).

- Trichobothrial insertions not pigmented, fewer than 9 lateral chaetae on VT...................................... 11

11. Body with narrow, interrupted, longitudinal stripe from thorax II to abdomen IV, manubrial thickening extremely multidentate, ventral tube with 3 + 3 lateral chaetae, mucro lacking chaeta............. afghanicus Yosii, 1966 Asia ( Afghanistan, Iran).

- Body with transverse pigmented bands, ventral tube with 5–6 lateral chaetae on each side, manubrial thickening normal (Potapov in one place says mucronal chaeta absent (key) and in another that it is present (description), (Fjellberg says it is present)......................................................... balteatus ( Reuter, 1876) Palearctic i.e. Eastern Boreal.