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Hi Rui,

I mentioned the lobes as a reference point because they are longer than L. sericata. I agree with L. richardsi. L. regalis has much more narrow cerci and sustyli. A few other 3 ac Lucilia have brown basicosta and or dark palpi which makes it easy to exclude them.

I'll attach a photo of sericata genitalia and st5 as a reference - in case you have not dissected sericata before.

Best wishes,
John