Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758 Phylum Nemertea Schultze, 1851 - ribbon worms Family Cephalothricidae McIntosh, 1874 Genus Procephalothrix Wijnhoff, 1913 1 Procephalothrix spiralis (Coe, 1930) 2.1 Procephalothrix simulus Iwata, 1952 2.2 Procephalothrix filiformis (Johnston, 1828)