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Description of Thanatus formicinus
Female 7 to 12 mm.
Abdomen light brown to grey-brown with a clear, black cardiac mark which is surrounded by a thin white border. At the rear sometimes two thin black curved lines.
Carapace light brown to grey-brown with a light median band.
Legs light brown to grey-brown with a few black spots.
Palps light brown to grey-brown.
Male 5 to 7.5 mm.
Markings almost identical to the female, but generally darker coloured.
Warm, dry areas on the ground and in low vegetation
Occurs in the whole of Europe, but not common.
Spring and summer.