derxia lacustris derxia lacustris derxia lacustris is a gram-negative, nitrogen-fixing, aerobic, motile bacterium of the genus derxia, isolated from a freshwater lake in taiwan. derxia lacustris scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: alcaligenaceae genus: derxia species: derxia lacustris binomial name derxia lacustrischen et al. 2013 type strain bcrc 80208, hl-12, kctc 23311