Dear jr.;- Among the wentletraps, we have a similar situation. In 1844, G.B. Sowerby (Either I, II, or III or a combination of all three) published both E. dubia and irregularis as different species. I have always maintained that the Sowerbys MUST have seen actual differences in the two. But people more knowledgeable than me (and bigger and stronger) have declared the two species to be only one. One question remaining is: so which one is it? We sem to have decided that irregularis is THE one---for no good reason I can think of. The reason the Sowerbys counted them as two may be that just like among the human species, there are individual diffences. In some species like E. lamellosum, the differences may be quite wide and lead to the publication of (in that case) about 20 synonyms. Some species are just more variable than others. Art