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Wait. G. vacua is differentiated from others like capitata, bimaculata and ornata , because its median dark stripe shrinks progressively at T5, till it ends, while the others got a stripe that enlarges from T5 (sometimes even from T4). I mean, is quite clear that here that stripe isn't enlarging in T5, instead is shrinking, isn't it?

I add a digitalized scheme of this dark median stripe on T5