Finding the right name for a specimen involves two major issues. First, there is the question of nomenclature-what names are appropriate designations for species? Is the name legally proposed or not? Is it spelled correctly? Secondly, there is the question of systematics - are these two forms different enough to deserve recognition as separate species, genera, etc.?
Campbell, David, "A Shell by Any Other Name Would be Mislabeled — Adventures in Nomenclature" (2015). Department of Natural Sciences Faculty Publications. Paper 1.