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A.dimdiata doesn't exist = They are Achatina immaculata var "two-tone"
A.panthera is obsolete = They are Achatina immaculata var "panthera"
Our stuhlmanni aren't so they would be Achatina immaculata var "small panthera" if they are not the dwarf variety. I don't want to call it "stuhlmanni" as stuhlmanni are a real species. They are either var. lamarckiana (the dwarf type from Madagascar/Mauritius) or just stunted/small "panthera", with the latter being by far the most likely.
Brown, blue, striped forms are not variants, they are aberrations within a variant. So it may make sense to have Achatina immaculata var "panthera brown", Achatina immaculata var. "panthera striped" to indicate this. To be perfectly honest this is more confusing since ventricose striped "panthera" are actually probably normal immaculata.
In the simplest terms, regardless of stripes/plain etc, if they are ventricose they are immaculata var. immaculata. If they are slim they are var. "panthera" because it was this difference that caused the slim ones to be considered different.
Получается, что большинство "пород" улитов, просто вариации одного-двух видов?