gramella antarctica gramella antarctica gramella antarctica is a gram-negative, rod-shaped aerobic and motile bacterium from the genus of gramella which has been isolated from surface sediments from the ross sea. gramella antarctica scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: gramella species: g. antarctica binomial name gramella antarcticali et al. 2018 type strain r17h11