Females reach about 8–13 mm length, males only 6–8 mm. Both sexes are coloured grey to brown. The whole spider has a furry appearance and is flattened in shape.
The species builds a kind of nest under the bark of dead trees. Up to 100 of these nests can occur side by side. This spider demonstrates a social hierarchy: weaker animals will acknowledge their inferiority by strutting their front legs and slowly retreating from the scene.
M. muscosa lives in the Palaearctic.
Though rare in England, it is found throughout the country, more in the south and east. The species is widespread in northern Europe.
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