Filters and filter arrangements are already known, wherein the filter on the outer circumference comprises a detent lug for a detent connection to a detent means of a mounting. The mounting for the filter comprises a detent means in which the detent lug snaps and which is configured as a recess. The disadvantage is that the detent connection is only difficult to detach, if at all, since the detent lug is difficult to move out of the recess. If this should be attempted with a tool, the position of the detent connection must be found. It is not certain that the tool engages in the proper location of the detent connection in order to release it. The risk of damaging the mounting with the tool is high, whereby the entire module would have to be replaced. With the filter according to the invention, and the filter arrangement according to the invention, the replaceability of the filter is improved. According to the invention, the at least one detent lug (14) is disposed between two longitudinal ribs (20) and at least one removal tool (19) is provided, which with the dimensions thereof can be inserted in a depression (21) formed by the longitudinal ribs (20) and the detent lug (14).