pasteurella testudinis pasteurella testudinis pasteurella testudinis is a gram-negative, nonmotile, rod-shaped species of bacteria of the family pasteurellaceae. strains of this species were isolated from desert tortoises (gopherus agassizi). pasteurella testudinis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: pasteurella binomial name pasteurella testudinissnipes and biberstein 1982 p. testudinis may be pathogenic in tortoises.