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This monkey cannot believe all the animals below are real

Unknown phylum

  • Micrognathozoa

Acanthocephala (thorny-headed worms)

  • Archiacanthocephala
  • Eoacanthocephala
  • Palaeacanthocephala (ancient thornheads)

Acoelomorpha (simple soft-bodied flatworms)

  • Acoela
  • Nemertodermatida

Annelida (segmented worms)

  • Aelosomata
  • Clitellata (earthworms)
  • Myzostomida
  • Polychaeta (bristle worms)
  • Echiura (spoon worms)
  • Sipuncula (peanut worms)

Arthropoda (arthropods: insects, crustaceans, arachnids, centipedes, and millipedes)

Chelicerata

  • Arachnida (spiders, scorpions, and kin)
  • Xiphosura (horseshoe crabs; only 4 extant species)
  • Pycnogonida (sea spiders)

Crustacea

  • Branchiopoda (fairy shrimp, tadpole shrimp, water fleas, and clam shrimp)
  • Cephalocarida (horseshoe shrimp; only 12 described species)
  • Malacostraca (crabs, lobsters, crayfish, krill, various shrimp, woodlice, and kin)
  • Maxillopoda (barnacles, copepods, fish lice, and other groups)
  • Ostracoda (seed shrimp)
  • Remipedia

Hexapoda

  • Entognatha (coneheads, two-pronged bristletails and springtails)
  • Insecta (insects)

Myriapoda

  • Chilopoda (centipedes)
  • Diplopoda (millipedes)
  • Pauropoda
  • Symphyla (pseudocentipedes)

Brachiopoda (“lamp shells”)

  • Craniforma
  • Rhynchonellata

Bryozoa (moss animals)

  • Gymnolaemata
  • Phylactolaemata
  • Stenolaemata

Chaetognatha (arrow worms)

  • Archisagittoidea
  • Sagittoidea

Chordata (vertebrates, tunicates, and lancelets)

Cephalochordata

  • Leptocardii (lancelet)

Tunicata

  • Appendicularia (larvaceans)
  • Ascidiacea (sea squirts)
  • Sorberacea
  • Thaliacea (salps, pyrosomes, and doliolids)

Vertebrata

Agnatha

Cyclostomata
  • Myxini (hagfish)
  • Petromyzontida (lamprey)

Gnathostomata

  • Chondrichthyes (cartilaginous fish, mostly sharks and rays)
Tetrapoda
  • Amphibia (amphibians)
  • Amniota
    • Mammalia (mammals)
    • Aves (birds)
    • Reptilia (reptiles)
Osteichthyes
  • Actinopterygii (ray-finned fish, which includes most familiar bony fish)
  • Sarcopterygii (lobe-finned fish)

Cnidaria (marine stinging animals)

  • Anthozoa (anemones and corals)
  • Cubozoa (box jellyfish)
  • Hydrozoa (hydroids)
  • Malacosporea (marine parasites)
  • Myxosporea (marine parasites)
  • Scyphozoa (true jellyfish)
  • Staurozoa (stalked jellyfish)
  • Polypodiozoa (marine parasites)

Cycliophora (tiny marine animals)

  • Eucycliophora

Dicyemida (rhombozoa)

  • Dicyemida

Echinodermata (starfish, sea urchins, sand dollars, sea lilies, and others)

Crinozoa

  • Crinoidea (sea lilies and feather stars)

Asterozoa

  • Asteroidea (star fish)
  • Ophiuroidea (brittle stars)

Echinozoa

  • Echinoidea (sea urchins)
  • Holothuroidea (sea cucumbers)

Entoprocta

  • Entoprocta

Gastrotricha (hairybacks)

  • Gastrotricha

Gnathostomulida (jaw worms)

  • Gnathostomulida

Hemichordata

  • Enteropneusta (acorn worms)
  • Pterobranchia

Kinorhyncha (mud dragons)

  • Kinorhyncha

Loricifera

  • Loricifera

Mollusca (mollusks)

  • Bivalvia (clams, mussels, scallops, and kin)
  • Caudofoveata
  • Cephalopoda (octopuses, squids and cuttlefish)
  • Gastropoda (snails and slugs)
  • Monoplacophora
  • Polyplacophora (chitons, or sea cradles)
  • Scaphopoda (tusk shells)
  • Solenogastres

Nematoda (roundworms)

  • Adenophorea
  • Chromadorea
  • Secernentea

Nematomorpha (horsehair worms)

  • Gordioidea
  • Nectonematoida

Nemertea (ribbon worms)

  • Anopla
  • Enopla

Onychophora (velvet worms)

  • Udeonychophora

Orthonectida

  • Orthonectida

Placozoa

  • Trichoplacoidea

Platyhelminthes (flatworms)

  • Cestoda (tapeworms and relatives)
  • Monogenea
  • Trematoda (flukes)
  • Turbellaria (e.g. Dugesia)

Porifera (sponges)

  • Calcarea (calcareous sponges)
  • Demospongiae
  • Hexactinellida (glass sponges)
  • Homoscleromorpha

Priapulida (priapulid worms)

  • Halicryptomorpha
  • Priapulimorpha
  • Seticoronaria

Rotifera (rotifers)

  • Bdelloidea
  • Monogononta
  • Seisonidea

Tardigrada (tardigrades, water bears, or moss piglets)

  • Eutardigrada
  • Heterotardigrada

Xenoturbellida

  • Xenoturbellida
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