They may contain either peritrichous or polar flagella.[3][4][5] This genus was first described in 1998, after the type species, Massilia timonae, was isolated from the blood of an immunocompromised patient.[5] The genus was named after the old Greek and Roman name for the city of Marseille, France, where the organism was first isolated.[5] However, 16S rRNA-based phylogenetic trees in 2023 determined that many Massilia species actually belong within the Telluria genus, which was validly published first, having nomenclatural priority.
Massilia are a diverse group that reside in many different environments, have many heterotrophic means of gathering energy, and are commonly found in association with plants.