Arctosa cinerea is one of the most conspicuous wolf spider of central Europe, with a palearctic distribution and also found in Congo. The spider reaches a length of 17 mm (males only 14 mm), and occurs only on sandy beaches of rivers, lakes and oceans. Its grey-brown color makes for a good camouflage, and so it is not often seen, even if it wanders around during daylight. They dig holes in the ground, which they cover with silk,...