Becoming is always of a different order than filiation. It concerns alliance. If evolution includes any veritable becomings, it is in the domain of symbioses that bring into play beings of totally different scales and kingdoms, with no possible filiation. There is a block of becoming that snaps up the wasp and the orchid, but from which no wasp-orchid could ever descend.
Deleuze and Guattari, A Thousand Plateaus, 1730: Becoming-Intense, Becoming-Animal, Becoming-Imperceptible p. 263 (via valterbenyamin)