meniscus (bacterium) meniscus (bacterium) meniscus is a gram-negative, heterotrophic and aerotolerant genus of bacteria from the family of prolixibacteraceae with one known species (meniscus glaucopis). meniscus scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: prolixibacteraceae genus: meniscusirgens 1977 (approved lists 1980) species m. glaucopis