A Gram-positive, coryneform bacterium, strain 1-19(T), was isolated from coastal sediment from the Eastern China Sea. Phylogenetic analysis based on 16S rRNA gene sequences showed that the organism formed a robust clade with the type species of the genus Sanguibacter and displayed less than 97% gene sequence similarity. Phenotypic characteristics supported the assignment of this organism to the genus Sanguibacter. A range of biochemical features distinguished it from all other Sanguibacter species with validly published names. On the basis of a polyphasic taxonomical analysis, it is proposed that this bacterium is a novel species of Sanguibacter, for which the name Sanguibacter marinus sp. nov. is proposed. The type strain is 1-19(T) (=CGMCC 1.3457(T)=JCM 12547(T)).