Strain Q3-56T, isolated from Arctic tundra soil, was found to be a Gram-stain-negative, yellow-pigmented, oxidase- and catalase-positive, non-motile, non-spore-forming, rod-shaped and aerobic bacterium. Strain Q3-56T grew optimally at pH 7.0 and 28 °C. The strain could tolerate up to 1 % (w/v) NaCl with optimum growth in the absence of NaCl. The strain was not sensitive to oxacillin and ceftazidime. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain Q3-56T belonged to the genus
Dyadobacter
. Strain Q3-56T showed the highest sequence similarities to
Dyadobacter luticola
T17T (96.58 %),
Dyadobacter ginsengisoli
Gsoil 043T (96.50 %),
Dyadobacter flavalbus
NS28T (96.43 %) and
Dyadobacter bucti
QTA69T (96.43 %). The predominant respiratory isoprenoid quinone was identified as MK-7, The polar lipid profile of strain Q3-56T was found to contain one phosphatidylethanolamine, three unidentified aminolipids, three unidentified lipids and one unidentified phospholipid. The G+C content of the genomic DNA was determined to be 49.1 mol%. The main fatty acids were summed feature 3 (comprising C16 : 1
ω7c/C16 : 1
ω6c), iso-C15 : 0, C16 : 1
ω5c and iso-C16 : 1 3-OH. On the basis of the evidence presented in this study, a novel species of the genus
Dyadobacter
, Dyadobacter sandarakinus sp. nov., is proposed, with the type strain Q3-56T (=CCTCC AB 2019271T=KCTC 72739T). Emended descriptions of
Dyadobacter alkalitolerans
,
Dyadobacter koreensis
and
Dyadobacter psychrophilus
are also provided.