Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Class Insecta Linnaeus, 1758 - insects Order Ephemeroptera Hyatt & Arms, 1891 - mayflies Family Siphlonuridae Ulmer, 1920 Genus Acanthometropus see Genus Acanthametropus Tshernova, 1948 †Acanthometropus pecatonica - Pecatonica River mayfly see Acanthametropus pecatonica (Burks, 1953)