First Reports of Galliconularia and Glyptoconularia (Cnidaria, Medusozoa) from the Silurian and Ordovician systems (respectively) of the Prague Basin (Czech Republic)

Estimates of the stratigraphical and paleogeographical ranges of fossil taxa depend on sample sizes, with the limiting case being a sample consisting of a single known specimen. The cnidarian order Conulariida Miller and Gurley, 1896 in the subphylum Medusozoa Petersen, 1979 comprises multiple genera that are represented by < 50 reposited specimens, in some cases from a single locality and stratum. The present note deals with two such genera, Galliconularia Van Iten and Lefebvre, 2020 and Glyptoconularia Sinclair, 1952. The former genus previously was known from the Lower Ordovician of the southern Montagne Noire in France; the latter was known from the Middle Ordovician of the central Moroccan Anti-Atlas (Van Iten et al., 2022) and from the Upper Ordovician of cratonic North America (Van Iten, 1994; Van Iten et al., 2022). Glyptoconularia was represented by < 12 reposited specimens, and Galliconularia was based on a total of 32 specimens.