Rhodothalassium is a genus of bacteria in the family Rhodothalassiaceae. Up to now there is only one species of this genus known (Rhodothalassium salexigens).
References
12Venkata Ramana V, Kalyana Chakravarthy S, Ramaprasad EV, Thiel V, Imhoff JF, Sasikala Ch, Ramana ChV (February 2013). "Emended description of the genus Rhodothalassium Imhoff et al., 1998 and proposal of Rhodothalassiaceae fam. nov. and Rhodothalassiales ord. nov". Systematic and Applied Microbiology. 36 (1): 28–32. doi:10.1016/j.syapm.2012.09.003.