[Kingdom] Animalia Linnaeus, 1758 - animals Grade Enterozoa Grade Cœlomata Phylum Nematoidea [Class] Nematoidea Rudolphi, 1808 see Phylum Nematoda Gegenbaur, 1859 [Family] Mermithidæ Weinland, 1858 Genus Mermis Dujardin, 1842