sagittula stellata sagittula stellata sagittula stellata is a lignin-transforming bacterium, the type species of its genus. it is gram-negative and rod-shaped, does not form spores, and is strictly aerobic. the type strain is e-37 (= atcc 700073). sagittula stellata scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodobacterales family: rhodobacteraceae genus: sagittula species: s. stellata binomial name sagittula stellatagonzalez et al. 1997