Sphingomonadaceae are a gram-negative bacterial family of the Alphaproteobacteria. An important feature is the presence of sphingolipids (mainly 2′-hydroxymyristoyl dihydrosphingosine 1-glucuronic acid, "SGL-1") in the outer membrane of the cell wall.[2][3] The cells are ovoid or rod-shaped. Others are also pleomorphic, i.e. the cells change the shape over time. Some species from Sphingomonadaceae family are dominant components of biofilms.[4][5][6]
^Garrity GM, Brenner DJ, Krieg NR, Staley JR, eds. (2005). Bergey's Manual of Systematic Bacteriology. Vol. Two The Proteobacteria, Part C: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. New York, New York: Springer. ISBN978-0-387-24145-6.