Kingdom Animalia Linnaeus, 1758 - animals Phylum Pogonophora Johansson, 1937 - beard worms see Family Siboglinidae Caullery, 1914 Order Thecanephria A.V. Ivanov, 1955 see Family Siboglinidae Caullery, 1914 Family Sclerolinidae Webb, 1964 see Family Siboglinidae Caullery, 1914 Genus Sclerolinum Southward, 1961