acidicaldus acidicaldus acidicaldus is a genus in the phylum pseudomonadota (bacteria), whose sole member is an acidophilic thermophile. acidicaldus scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: acidicaldus type species a. organivorans etymology the name acidicaldus derives from: neo-latin acidum (from latin adjective acidus, sour), an acid; latin caldus, warm, hot; giving acidicaldus, a (moderately) thermophilic acid-requiring microorganism. species the genus contains single species, namely a. organivorans (corrig. johnson et al. 2006, (type species of the genus); neo-latin organum, organic compound; latin vorans, devouring; giving organivorans, devouring organic compounds.)