psychrobacter pygoscelis psychrobacter pygoscelis psychrobacter pygoscelis is a gram-negative and rod-shaped bacterium from the genus psychrobacter which has been isolated from the trachea of a penguin (pygoscelis papua) from the fildes bay. psychrobacter pygoscelis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceae genus: psychrobacter species: p. pygoscelis binomial name psychrobacter pygosceliskämpfer et al. 2020 type strain i-stpp5b