ignisphaera ignisphaera in taxonomy, ignisphaera is a genus of the desulfurococcales. ignisphaera aggregans is a coccoid- shaped, fourth type strain that is strictly anaerobes with anaerobic respiration. this archaea species are hyperthermophiles that were found in new zealand's hot springs in kuirau park, rotorua. ignisphaera scientific classification domain: archaea phylum: thermoproteota class: thermoprotei order: desulfurococcales family: desulfurococcaceae genus: ignisphaera binomial name ignisphaeraniederberger et al. 2006 species i. aggregans