Dear all, I have an interesting question that I hope someone on here can answer. Yesterday, as I was browsing the net, I came across a photo of Cancellaria mercadoi. It was a typical specimen of the species, but in the aperture was something not so typical: an operculum. The Compedium says none of the Cancellariidae have opercs. Can anyone help relieve me of this confusion? Is it true that none have percs, or do some of them do? Regards, James