Harry, I was pleasantly surprised to find N. delessertiana in my collection from Sanibel. I also have it as a fossil from the late Pleistocene Ft. Thompson Formation from a shallow excavation in West Palm Beach and probably from the Bermont Formation (but from spoil) in Okeechobee. I could not find it from the Caloosahatchee Formation, but I only checked a few specimens from a few places. Perhaps others with more extensive (and better organized) collections could find it in the Caloosahatchee and verify the Bermont occurence? Allen Aigen [log in to unmask]