halostagnicola halostagnicola in taxonomy, halostagnicola is a genus of the archaea. halostagnicola scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: halobacteria order: natrialbales family: natrialbaceae genus: halostagnicolacastillo et al. 2006 species h. alkaliphila h. bangensis h. kamekurae h. larsenii (type sp.)