parvularcula bermudensis parvularcula bermudensis parvularcula bermudensis is a marine bacterium which was identified in 2003 in the western sargasso sea in the atlantic ocean. it forms a deep branch in the alphaproteobacteria, distinct from the other orders. parvularcula bermudensis scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: parvularculales family: parvularculaceae genus: parvularcula species: p. bermudensis binomial name parvularcula bermudensischo and giovannoni 2003 parvularcula bermudensis isolates are gram-negative, strictly aerobic, chemoheterotrophic, slightly motile short rods with a single flagellum. colonies on marine agar are very small (0·3–0·8 mm in diameter), yellowish-brown and very hard. they are oxidase positive and catalase negative.