 The current taxonomy of "Helicobacter" bacteria is a bit complex and incomplete with new species currently being considered as possibly belonging to the "Helicobactor" genus.Within the "Helicobacter" genus, "Helicobacter heilmannii" are a group of "Helicobacter" species that are distinguished from "H. pylori" by being 2- to 3-fold larger in size (they are 4-10 micrometers in length and 0.5-0.8 micrometers in width while "H. pylor" are 2.5-4 micrometers in length and 0.5-1.0 micrometers in width) as well as in the position and noumber of their flagella (they have 4-23 flagella which are located at only one of their ends while "H. pylori" have 4-8 flagella which are divided between both of their ends).The "Helcobacter heilmannii" grouping of bacteria is further divided into two groups