Nisaea is a genus in the phylum Pseudomonadota (Bacteria),[2] which contains two[3] species, namely N. denitrificans and N. nitritireducens, which were described in 2008.
[4]) They were isolated from coastal, surface waters of the north-western Mediterranean Sea, specifically in February 2004 at the SOLA station located in the bay of Banyuls-sur-Mer (42 2.99 N 3 0.89 E) at a depth of 3 metres.
[1] When grown on marine agar medium, they form cream colonies (i.e. no pigmentation).
Apart from standard genetic differences for species (98% 16S, 55% DNA-DNA), the two species differ in that Nisaea denitrificans can fully denitrify whereas Nisaea nitritireducens cannot only reduce nitrite.
[1] Nicaea is in fact a sea nymph and daughter of the river-god Sangarius and Cybele.