“…This family comprises of four well-known PAH-degrading genera, namely; Sphingomonas (Busse et al, 2003;Chen et al, 2012Chen et al, , 2013Takeuchi et al, 2001;Yabuuchi et al, 2002Yabuuchi et al, , 1999, Sphingobium (Busse et al, 2003;Takeuchi et al, 2001), Novosphingobium (Busse et al, 2003;Takeuchi et al, 2001), Sphingopyxis (Busse et al, 2003;Takeuchi et al, 2001;Yoon et al, 2008, which make up the sphingomonads (Kosako et al, 2000). Currently, ten other genera have been established in this family, including Sphingosinicella Maruyama et al, 2006;Yasir et al, 2010), Sandarakinorhabdus (Gich and Overmann, 2006), Stakelama (Chen et al, 2010;Thawng et al, 2013), Sphingorhabdus , Zymomonas (Glaeser and K€ ampfer, 2014), Sandaracinobacter (Yurkov et al, 1997), Sphingomicrobium (K€ ampfer et al, 2012), Blastomonas (Hiraishi et al, 2000), Pacificamonas (Liu et al, 2014) and Parasphingopyxis (Uchida et al, 2012).…”