oxymeris maculatus confirmation

[underwaterdream]

Dear all,

I am almost sure that this is an oxymeris maculatus. Only the color seems unusual.
Are they various forms of maculatus or this is just a color variation.
Does someone knows how common is this color variation ?

Many questions :o , thanks for any help

https://imageshack.com/a/img32/5359/n73o.jpg

[paul monfils]

Yes, this is Oxymeris maculatus. The rusty color is due to mineral staining. It occurs on many kinds of shells which live on iron-rich sediment, especially those which burrow in it.