Hi Ellen, Sounds like a great specimen! Don't pay too much attention to the designations "common", "uncommon", and "rare" in the Compendium. Many of them are very misleading. Some of them may have been correct when the book was published, but are not currently so. Others are just way off the mark, and were from the start. Yes, pinna means feather, and pinnatus means feathered, or resembling a feather, or - in english - pinnate. Paul M.