aestuariibacter aestuariibacter aestuariibacter is a genus in the class gammaproteobacteria (bacteria), composed of four species, namely a. aggregatus, a. halophilus, a. litoralis and the type species a. salexigens. these are strictly aerobic marine rod-shaped bacteria. they share many traits with the sister genus alteromonas, the type genus of the family (alteromonadaceae) and order (alteromonadales). for the actinobacterium aestuariimicrobium, see aestuariimicrobium. aestuariibacter scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: alteromonadaceae genus: aestuariibacterye et al. 2004 type species aestuariibacter salexigens species aestuariibacter aggregatus aestuariibacter halophilus aestuariibacter salexigens etymology the name aestuariibacter derives from the latin noun aestuarium, a tidal flat (the part of the sea coast which, during the flood-tide, is overflowed, but at ebb-tide is left covered with mud or slime) and the neo-latin masculine gender noun bacter, bacterium and thus means a tidal-flat bacterium, as three species, except a. halophilus from the yellow sea, were isolated in tidal flats.