The invention relates to Citrobacter phytases derived from Citrobacteramalonaticus, Citrobacter gillenii, and related phytases. The phytases belongto the acid histidine phosphatase family, are acid-stable, and expectedly of ahigh specific activity. The invention also relates to the corresponding DNA,the recombinant and wild-type production of the phytases, as well as the usethereof, in particular in animal feed.