the dark spots on the lower house is soil i wasn't able to wash out, the yellow colour that seems to be a spot was actually the snails real colour. as i understand it, snails use to chew on empty houses of "former" snails because they need a calcium source for building up theirs, and as it looks like, the topp one has been chewed on a lot. i have also a spotting of a different colour-morphing of capea hortensis with allmost the same drawing (thus, same or close population) where you can see this "bleaching" effect even better.
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the dark spots on the lower house is soil i wasn't able to wash out, the yellow colour that seems to be a spot was actually the snails real colour.
as i understand it, snails use to chew on empty houses of "former" snails because they need a calcium source for building up theirs, and as it looks like, the topp one has been chewed on a lot. i have also a spotting of a different colour-morphing of capea hortensis with allmost the same drawing (thus, same or close population) where you can see this "bleaching" effect even better.
looks interesting!Can you explain your spotting a little?