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Description of Thanatus arenarius
Female 5.5 to 8.5 mm.
Abdomen white-grey with a very clear black cardiac mark which is surrounded by a thin white border. In the middle of the rear side a darker area with two thin, black, curved lines along both sides.
Carapace grey with two narrow white longitudinal bands and white-grey edges.
Legs and palps grey.
Male 4 to 6.5 mm.
Markings and colours almost identical to the female. Carapace is reddish brown in colour and the legs are more reddish.
Dry and semi-dry regions and steppes. Also, more towards the coast in sandy areas.
Occurs in almost the whole of Europe.
Spring and summer.