Rotor having of rotor blades. Every rotor blade has a blade body and coupling segment. A width of the coupling element segment is defined in circumferential direction by edges extending in axial direction. The coupling segment is contoured at a first side such that, on the flow inlet side to a flow inlet edge, the radially outer edge projects beyond the radially inner edge in axial direction. At this side on the flow outlet side of the blade body, the radially inner edge projects beyond the radially outer edge. The coupling segment is contoured at a second side such that, adjacent on the flow outlet side to the flow outlet edge, the radially outer edge extending in axial direction projects beyond the radially inner edge in axial direction. At, this second side facing away from the flow inlet edge the radially inner edge projects beyond the radially outer edge.