 E. coli is the type species of the genus ( Escherichia ) and in turn Escherichia is the type genus of the family Enterobacteriaceae , where the family name does not stem from the genus Enterobacter + " i " ( sic . ) + " aceae " , but from " enterobacterium " + " aceae " ( enterobacterium being not a genus , but an alternative trivial name to enteric bacterium ) . 
