A Gram-stain-negative, aerobic, non-spore-forming, non-motile and rod-shaped bacterial strain, designated BSSL-BM3T, was isolated from sand collected from a dune near the Yellow Sea, Republic of Korea, and subjected to a polyphasic taxonomic study. The neighbour-joining phylogenetic tree of 16S rRNA gene sequences showed that strain BSSL-BM3T fell within the clade comprising the type strains of
Arenibacter
species. Strain BSSL-BM3T exhibited 16S rRNA gene sequence similarity values of 98.0–99.0 % to the type strains of
Arenibacter catalasegens
,
Arenibacter hampyeongensis
,
Arenibacter echinorum
,
Arenibacter palladensis
and
Arenibacter troitsensis
and of 94.2–96.7 % to the type strains of the other
Arenibacter
species. The averagenucleotide identity and digitalDNA–DNA hybridization values between strain BSSL-BM3T and the type strains of
A. catalasegens
,
A. hampyeongensis
,
A. echinorum
,
A. palladensis
and
A. troitsensis
were 82.2–88.8 % and 25.0–36.5 %, respectively. The DNA G+C content of strain BSSL-BM3T from genomic sequence data was 38.75 mol%. Strain BSSL-BM3T contained MK-6 as the predominant menaquinone and iso-C17 : 0 3-OH, summed feature 3 (C16 : 1
ω7c and/or C16 : 1
ω6c) and iso-C15 : 1 G as the major fatty acids. The major polar lipids of strain BSSL-BM3T were phosphatidylethanolamine and two unidentified lipids. Distinguishing phenotypic properties, along with the phylogenetic and genetic distinctiveness, revealed that strain BSSL-BM3T is separated from recognized
Arenibacter
species. On the basis of the data presented here, strain BSSL-BM3T is considered to represent a novel species of the genus
Arenibacter
, for which the name Arenibacter arenosicollis sp. nov. is proposed. The type strain is BSSL-BM3T (=KACC 21632T=NBRC 114502T).