silvanigrella silvanigrella silvanigrella is a genus of the phylum bdellovibrionota. the genus currently contains two described species: silvanigrella aquatica and silvanigrella paludirubra. silvanigrella scientific classification domain: bacteria phylum: bdellovibrionota class: oligoflexia order: silvanigrellales family: silvanigrellaceae genus: silvanigrellahahn et al. 2017 type species silvanigrella aquatica species s. aquatica hahn et al. 2017 s. paludirubra pitt et al. 2020