Corynebacterium matruchotii is one of the 12 or more bacterial species in the genus Corynebacterium. Corynebacteria occur within the normal flora of the human body.

Corynebacterium matruchotii is a Gram positive (G+) bacilli with long filaments and short, thick terminal ends. Corynebacterium matruchotii is a bacterium of significance within the oral cavity and comprises the central filament of "corn-cob formations" (formations in which Streptococcus sanguinis

Streptococcus sanguinis

Streptococcus sanguinis, formerly known as Streptococcus sanguis, is a Gram-positive facultative aerobic coccus species of bacteria and a member of the Viridans Streptococcus group. S...

bacteria bind to and surround Corynebacterium matruchotii to create a corn-cob appearance). Corynebacterium matruchotii can be isolated from dental plaque, although is it not known to be associated with the etiology of dental diseases.