neptunicoccus neptunicoccus neptunicoccus is a gram-negative and aerobic genus of bacteria from the family of rhodobacteraceae with one known species (neptunicoccus sediminis). neptunicoccus sediminis has been isolated from sediments from the yellow sea. neptunicoccus scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodobacterales family: rhodobacteraceae genus: neptunicoccus zhang et al. 2018 type species neptunicoccus sediminis species n. sediminis