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for short: yes it is usefull
longer version: I have a theory that color pattern differ in each species but probably also differ within a species. I think that each species has 2 different color patterns and propably (not proven yet) these are related to male and female larvae. At least 2 color patterns exist withing O. viridula and I was able to breed few and indeed the females had another colorpattern than males, but this is not enough prove. Any help in this is appreciated.
The large larvae (1) is O. ornata, no. 2 and 4 are both O. viridula and 3 probably Od. tigrina juvenile.