article: List of animal phyla
links: Hydrozoa Limnognathia Bryozoa Acoelomorpha Nemertodermatida Mantle (mollusc) Aplacophora Urochordata Cestoda Cephalocarida Hexapoda Mesozoic Anthozoa Trematoda Chilopoda Cephalochordata Gnathostomulida Crustacea Cubozoa Hirudinea Deuterostomia Platyhelminthes Placozoa Sipuncula Accordion Axis of rotation P/Tr extinction event Paraphyletic Insecta Particle size (grain size) Chitin Lophotrochozoa Myriapoda Tardigrada Parasite Symphyla Cambrian Palaeozoic Permian Craniata Nemertea Lophophore Kinorhyncha Ostracoda Cephalopod Cnidarian Land Nematoda Ediacaran Nematocyst Porifera Bivalve Gastrotricha Trematode Remipedia Eurypterid Ctenophora Phoronida Onychophora Hemichordata Bilateria Turbellaria Polyplacophora Xiphosura Echinodermata Arachnida K/T extinction event Gastropod Entognatha Orthonectida Coelenterata Oligochaeta Pauropoda Ecdysozoa Rhombozoa Nematomorpha Chordata Rotifera Vertebrata Order (biology) Myxozoa Malacostraca Cnidaria Crinoidea Annelida Priapulida Loricifera Chaetognatha Pycnogonida Ocean Scaphopod Symmetry in biology Linnaeus Entoprocta Graptolite Xenoturbellida DNA Polychaeta Enteropneusta Nature Apterygota Diplopoda Staurozoa Scyphozoa Acanthocephala Branchiopoda Monoplacophora Maxillopoda Echiura Cuvier Monogenea Trichoplax adhaerens Burgess Shale Xenacoelomorpha Pterobranchia Mollusca Hexactinellida Brachiopoda Chelicerata