Filter with barb-shaped bayonet receptacle and filter element

The invention relates to a filter (10) having at least a first bayonet joint (22). The first bayonet joint (22) has a first bayonet slotted guide (26) with two locking positions that are axially spaced apart from one another for a first bayonet projection (24) of the first bayonet joint (22). By rotating a filter part for releasing the first bayonet joint (22), the first bayonet projection (24) may be moved from the second locking position into the first locking position. The filter (10) preferably has a second bayonet joint (28). The second bayonet joint (28) is preferably embodied such that, by further rotation in the same direction of rotation, it is released in that a second bayonet projection (30) is moved out of a third locking position of a second bayonet slotted guide (32) of the second bayonet joint (28) after the first bayonet projection (24) has been stopped in the first locking position. The second locking position is preferably embodied axially offset from the first locking position such that when the first bayonet projection (24) is moved from the second locking position into the first locking position, there is an increase in the volume of the filter (10) in which medium of the filter (10) may be received.