 Microbialism has been part and parcel of Dupré and O’Malley’s plaint against the macrobist bias in the philosophy of biology and the positive case they have made for the significance of the microbial world for reconceptualizing biological individuals (O’Malley 2014, 2015; O’Malley, Simpson, &amp; Roger 2013; Dupré 2010). One direction that this has been taken is Dupré’s (2012) promiscuous individualism. 