In Bavaria, Cardiophorus asellus are threatened with extinction according to the Red List of threatened animals.
|Adults reach body lengths of 7. 5-10. 5 mm. The upper surface of their bodies is densely covered with grey or brown hair and therefore appears grey although it is in fact black. The wing covers (elytra ) have a series of small indentations. The antennae are black and remarkably long. The larvae of these beetles develop in sandy soils.|