castellaniella hirudinis castellaniella hirudinis castellaniella hirudinis is a gram-negative, rod-shaped, non-spore-forming, bacterium from the genus castellaniella, isolated from the skin of a juvenile medical leech (hirudo verbana) in biebertal, germany. castellaniella hirudinis scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: alcaligenaceae genus: castellaniella species: c. hirudinis binomial name castellaniella hirudinisglaeser et al. 2013 type strain ccug 62394, e103, lmg 26910