arcobacter bivalviorum arcobacter bivalviorum arcobacter bivalviorum is a species of gram-negative, slightly curved, motile, rod-shaped bacteria first recovered from mussels and clams. its type strain is f67-11(t)=cect 7836(t)=lmg 26156(t)). arcobacter bivalviorum scientific classification domain: bacteria phylum: campylobacterota class: "campylobacteria" order: campylobacterales family: arcobacteraceae genus: arcobacter species: a. bivalviorumlevican et al. 2012 binomial name arcobacter bivalviorum