the diagram is fine as the body stripes may be diffrent on the ST and IT but its the tail stripes that count
ST will always have the same tail stripes even if they have fork or y stripes
IT will always have the same tail stripes even if they look like a ST
AT will always have the same tail stripes and normal the same body stripes
NTT will always have the same tail stripes and normal the same body stripe
NGT will always have the same messy tail and body stripes
so if you go buy the tail stripes you cant normaly go wrong
its only ST and IT that some people have trouble with telling them apart
ST or D. pulcher is actually very disputed as to their real tail stripe that characterizes the species. I have attached, 4 different tail stripes of which ALL are described as D. pulchers.
NTT or D. undecimradiatus also displays two different tail stripes.



