Methanotrix soehngenii
Methanotrix sochngenii is a strand of archaebacteria that does not actually possess a nervous system. It is a strand of euryarchaeota, which consist mostly of halophiles and methanogens. They respond well to stimuli given off by salty environments, because of their ability to survive in that area of the world. Also, without a nervous system, these types of bacteria tend to have simple responses of life and death.
Methanogens
Halophiles