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|Status as species: André, 1883a: 294; Ruzsky, 1905b: 616; Schär et al., 2018 10.1111/jbi.13380 PDF: 6.|
|Senior synonym of Leptothorax muscorum betulae, Leptothorax muscorum fagi, Leptothorax muscorum flavescens: Radchenko, 1995a: 25.|
|Current subspecies: nominal plus Leptothorax muscorum uvicensis.|
Worker. Pale brown to brown with antennal clubs and head often slightly darker. Propodeal spines short but distinct. General appearance more slender than L. acervorumHNS. Head striate, alitrunk rugose and gaster smooth. Appendage hairs few and adpressed. Clypeus in some Scandinavian series have a distinct median concavity as described for L. gredleri MayrHNS (Buschinger, 1966) but they are not otherwise different from the typical species. Length: 2.4-3.2 mm. Queen. As worker, normally darker. Length: 2.7-3.2 mm.
Distribution. South to Central Fennoscandia not uncommon, till about latitude 63°. Local in Denmark. Absent from British Isles. - Range: Appenines to Central Scandinavia and Pyrenees to Urals, not found in British Isles but common in continental Europe.
Biology. This species is similar to L. acervorumHNS but smaller and more slender. In Scandinavia, it Ls restricted to sheltered valleys in woodland areas where it nests in stony banks, tree stumps or under bark. Its habits are similar to those of L. acervorumHNS with small colonies having one or occasionally two queens. Males and alate queens are found in July and August.
Found most commonly in these habitats: 62 times found in Unknown, 36 times found in Aspen forest, 27 times found in heathlands, 17 times found in spruce-fir forest, 16 times found in Mixed montane forest, 12 times found in Tundra heath, 11 times found in Meadow, 10 times found in Lodgepole pine forest, 9 times found in Aspen-lodgepole pine forest, 8 times found in Spruce-tamarack forest, ...
Found most commonly in these microhabitats: 36 times under rock, 17 times log stage 4, 14 times log stage 3, 10 times log stage 2, 5 times log stage 5, 4 times under wood, 3 times dead stick, 3 times rotting stump, 3 times log stage 3 in meadow, 2 times wind timber, 2 times under stone, ...
Collected most commonly using these methods: 43 times Pitfall trap, 7 times Manual catch, 1 times Hand, 1 times Malaise trap, 1 times pitfall, 1 times search.
Elevations: collected from 30 - 3810 meters, 2488 meters average