So I've been reading about paleontology for awhile now, I've read all sorts of books and articles and theses, but the one thing I don't understand is what is the complete list of levels of classification? The average example usually shows eight, in this order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species. But since this is only basic taxonomy there are more than just eight; the ones I know are: Domain, Kingdom, Phylum, Subphylum, Grandclass, Class, Subclass, Infraclass, Legion, Cohort, Grandorder, Order, Suborder, Family, Subfamily, Tribe, Genus, Species, and Subspecies; but then I remembered seeing the clade with dinosaurs and birds was shared, so where is clade in the list, and are there more classifications than I mentioned? If so, then what are they and how many do paleontologists typically actually use, and are classifications used in that order all the time, or are there some classifications that have no specific order?