Annwoodia  The genus Annwoodia was named in 2017 to circumscribe an organism previously described as a member of the genus "Thiobacillus", "Thiobacillus aquaesulis" - the type and only species is "Annwoodia aquaesulis", which was isolated from the geothermal waters of the Roman Baths in the city of Bath in the United Kingdom by Ann P. Wood and Donovan P. Kelly of the University of Warwick - the genus was subsequently named to honour Wood's contribution to microbiology. The genus falls within the family "Thiobacillaceae" along with "Thiobacillus" and "Sulfuritortus", both of which comprise autotrophic organisms dependent on thiosulfate, other sulfur oxyanions and sulfide as electron donors for chemolithoheterotrophic growth. Whilst "Annwoodia" spp. and "Sulfuritortus" spp. are thermophilic, "Thiobacillus" spp. are mesophilic. "A. aquaesulis" is moderately thermophilic with an optimum temperature of 43 °C and a temperature range of 30 °C to 55 °C - a similar temperature profile to the related genus "Sulfuritortus" - and is a facultative chemolithoautotroph that grows on reduced sulfur oxyanions such as thiosulfate as the electron donor and carbon dioxide or bicarbonate as the carbon source. Unlike "Thiobacillus" spp., "Annwoodia" spp. do not produce tetrathionate during growth on thiosulfate and can also grow heterotrophically on nutrient broth. Elementary sulfur is deposited by the organism in batch culture with thiosulfate as the electron donor, but not in chemostat culture. "A. aquaesulis" can use nitrate as a terminal electron acceptor, as well as molecular oxygen. The dominant respiratory quinone is ubiquinone-8 and the G+C fraction of the type strain of the type species is 67.5 mol%. All members of the genus produce volutin (polyphosphate) granules but not capsules or endospores. "A. aquaesulis" has a pH optimum of 7.5-8.0 and pH range of 7.0 to 9.0.