joostella atrarenae joostella atrarenae joostella atrarenae is a gram-negative and motile bacterium from the genus of joostella which has been isolated from black sea sand from the jeju island. joostella atrarenae scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: joostella species: j. atrarenae binomial name joostella atrarenaekim et al. 2011 type strain m1-2