This oscillator first appeared naturally on April 3, 2022, in a soup found by Charity Engine using apgsearch, though a seminatural C4_1 tetramerisation occurred on March 4, 2022, 30 days earlier, in which each quadrant's eater head is fused to the roughly-melusine to form a roughly-fuse with tail and nine. The reduction of the 5 cells in the eater body and melusine tail seems to make it easier to find than the monomer, despite each quadrant having to occur at a fixed displacement from the centre. On May 17, 2022, Charity Engine also found a D8_1 oscillator, that contains the frob's rotor in each of its octants, with the roughly-melusine's eater tail's stabilisation fulfilled by gutter preservation, and has 4.5 fewer cells per octant than the monomer.
A similar replacement of the roughly-melusine to that in the D8_1 variant above can be achieved with a dimer with a tub. Two eater/block frobs can also hassle a beacon (that replaces the block for each), in either a cis- or trans- configuration, from which another D8_1 variant has also occurred seminaturally, with the eaters on the outside.