Brian Ogilvie (History, University of Massachusetts, Amherst)
Order of Insects: Insect Species from Jan Swammerdam to August Johann Roesel von Rosenhof

In the seventeenth century European naturalists took a new interest in the study of insects. Late Renaissance works on hemimetabolous and holometabolous insects divided them into kinds based on the morphology of each life stage; for instance, Ulisse Aldrovandi’s De animalibus insectis (1602) treated caterpillars and adult butterflies as distinct insect groups, even though he was aware that the former metamorphosed into the latter. Late seventeenth- and early eighteenth-century naturalists, on the other hand, developed a new diachronic concept of insect species, using differences in metamorphosis to define higher-level taxa. At the same time they were increasingly aware of the vast diversity of insect species. This paper explores attempts to produce insect taxonomies that made sense of both development and diversity from the work of Jan Swammerdam (1637-1680) to that of August Johann Roesel von Rosenhof (1705-1759).