List of bilateral animal orders

List of bilateral animal orders contains the Bilateria of the animal subkingdom Eumetazoa, divided into four superphyla, Deuterostomia, and the three Protostome superphyla, Ecdysozoa, and the two Spiralia superphyla, Platyzoa and Lophotrochozoa.

Xenacoelomorpha

Xenoturbellida

Acoelomorpha

	Nemertodermatida

	Acoela

Olfactores

	Urochordata

	Craniata (including Vertebrata)

Ambulacraria

	Echinodermata

	Hemichordata

	Nematoda

	Nematomorpha

Tardigrada

	Onychophora

	Arthropoda

Scalidophora

	Priapulida

	Loricifera

	Kinorhyncha

Spiralia*

Polyzoa

Bryozoa

	Entoprocta

	Cycliophora

	Brachiopoda

	Phoronida

	Gnathostomulida

	Micrognathozoa

	Rotifera

The relative number of species contributed to the total by each phylum of animals. Arthropoda is the phylum with the most individual organisms.

Superb fairy-wren, Malurus cyaneus

Differences between Deuterostomes and Protostomes

Yellow-winged darter, Sympetrum flaveolum

Pseudobiceros bedfordi, (Bedford's flatworm)

The use of love darts by the land snail Monachoides vicinus is a form of sexual selection

Phylum Xenacoelomorpha

Subphylum Xenoturbella

Class incertae sedis (Family Xenoturbellidae)

Subphylum Acoelomorpha

Class Acoela
- Order incertae sedis (16 families)
Class Nemertodermatida
- Order incertae sedis (2 families)

Infrakingdom Deuterostomia

Phylum Chordata

Phylum Hemichordata

Acorn worm

Class Enteropneusta (Acorn worms)

Order Enteropneusta

Class Graptolithina †

Order Camaroidea †
Order Crustoidea †
Order Dendroidea †
Order Dithecoidea †
Order Graptoloidea †
Order Stolonoidea †
Order Tuboidea †

Class Planctosphaeroidea

No order, one genus, one species Planctosphaera pelagica

Class Pterobranchia

Order Cephalodiscida
Order Rhabdopleurida

Phylum Echinodermata

Infrakingdom Protostomia

Phylum Kinorhyncha

Kinorhyncha

No class, 2 orders, called mud dragons, very common in mud or sand

Order Cyclorhagida
Order Homalorhagida

Phylum Loricifera

Pliciloricus enigmatus

No class, one order Nanaloricida

Phylum Priapulida

Priapulus caudatus

Class Priapulimorpha

Order Priapulimorphida
- Family Priapulidae
- Family Tubiluchidae

Class Halicryptomorpha

Order Halicryptomorphida

Class Seticoronaria

Order Seticoronarida
- - Genus Maccabeus

Phylum Nematoda

Phylum Nematomorpha

Class Gordioidea
Class Nectonematoida

Phylum Lobopodia †

Class Dinocaridida

Kerygmacheloidea
- Kerygmachela
- Pambdulurion
Anomalocaromorpha
- Parapeytoia
- Anomalocaria
  - Opabiniidae
    - Opabinia
    - Myoscolex
  - Anomalocarida
    - Pennsylvaniocaris
    - Piococaris
    - Sarocaris
    - Paranomalocaris
    - Anomalocarididae

Class Xenusia

Order Archonychophora
- Luolishaniidae
  - Luolishania
  - Miraluolishania
- Paucipodiidae
  - Paucipodia
Order Protonychophora
- Aysheaiidae
  - Aysheaia
- Xenusiidae
  - Xenusion
  - Jianshanopodia
  - Hadranax
  - Siberion
Order Archonychophora
- Luolishaniidae
  - Luolishania
  - Miraluolishania
- Paucipodiidae
  - Paucipodia
Order Scleronychophora
- Eoconchariidae
  - Microdictyon
  - Quadratapora
  - Fusuconcharium
- Hallucigeniidae
  - Hallucigenia
- Cardiodictyidae
  - Cardiodictyon
Order Paronychophora
- Onychodictyidae
  - Onychodictyon
Order unassigned
- Orstenotubulus
- Carbotubulus
- Mureropodia

Phylum Onychophora

Order Euonychophora
- Family Peripatidae
- Family Peripatopsidae
Order Ontonychophora †
- Family Helenodoridae †
- Family Tertiapatoidea †

Phylum Tardigrada

Hypsibius dujardini

Echiniscus

Class Eutardigrada

Order Apochela
- Family Milnesiidae
Order Parachaela
- Family Beornidae
- Family Calohypsibiidae
- Family Eohypsibiidae
- Family Hypsibiidae
- Family Macrobiotidae
- Family Microhypsibiidae
- Family Necopinatidae

Class Heterotardigrada

Order Arthrotardigrada
- Family Archechiniscidae
- Family Batillipedidae
- Family Coronarctidae
- Family Halechiniscidae
- Family Renaudarctidae
- Family Stygarctidae
Order Echiniscoidea
- Family Echiniscidae
- Family Echiniscoididae
- Family Oreellidae

Phylum Arthropoda

Phylum Gnathostomulida

No classes

Order Bursovaginoidea
Order Filospermoidea

Phylum Micrognathozoa

Some dispute here with Micrognathozoa as the class and Limnognathia as the order

Phylum Cycliophora

Class Eucycliophora

Order Symbiida
- Family Symbiidae
  - Genus Symbion

Phylum Rotifera

SEM] pictures of some Bdelloidea species of the genus Rotaria with head (red), tail (white) and trunk (blue) areas highlighted

Class Bdelloidea

Order Bdelloida

Class Monogononta

Order Collothecida
Order Flosculariida
Order Ploimida

Class Seisonidea

Order Seisonida

Phylum Acanthocephala

Scanning electron microscopy of proboscis of an archiacanthocephalan [1]

Class Archiacanthocephala

Class Eoacanthocephala

Order Gyracanthocephala
Order Neoechinorhynchida

Class Palaeacanthocephala

Order Echinorhynchida
Order Polymorphida

Phylum Dicyemida

No classes, no orders, families Conocyemidae, Dicyemidae and Kantharellidae

Phylum Monoblastozoa

No classes, no orders, family Salinellidae

Phylum Orthonectida

No classes, no orders, families Pelmatosphaeridae and Rhopaluridae

Phylum Platyhelminthes

Taenia saginata

Class Rhabditophora

Subclass Macrostomorpha
- Order Dolichomicrostomida
Subclass Trepaxonemata
- Infraclass Neoophora
  - Parvclass Eulecithophora
    - Superorder Adiaphanida
      - Order Fecampiida
      - Order Prolecithophora
      - Order Tricladida
    - Order Rhabdocoela
  - Order Bothrioplanida
  - Order Lecithoepitheliata
  - Order Proseriata
- Order Gnosonosemida
- Order Polycladida
- Order Prorhynchida

Subphylum Neodermata Class Cestoda

Subclass Eucestoda
- Order Bothriocephalidea
- Order Caryophyllidea
- Order Cathetocephalidea
- Order Cyclophyllidea
- Order Diphyllidea
- Order Diphyllobothriidea
- Order Haplobothriidea
- Order Lecanicephalidea
- Order Litobothriidea
- Order Nippotaeniidea
- Order Onchoproteocephalidea
- Order Phyllobothriidea
- Order Proteocephalidea
- Order Pseudophyllidea
- Order Rhinebothriidea
- Order Spathebothriidea
- Order Tetrabothriidea
- Order Tetraphyllidea
- Order Trypanorhyncha

Class Monogenea

Subclass Monopisthocotylea
- Order Capsalidea
- Order Dactylogyridea
- Order Gyrodactylidea
- Order Monocotylidea
- Order Montchadskyellidea
Subclass Polyopisthocotylea
- Order Chimaericolidea
- Order Diclybothriidea
- Order Mazocraeidea
- Order Polystomatidea

Class Trematoda

Botulus microporus

Subclass Aspidogastrea
- Order Aspidogastrida
- Order Stichocotylida
Subclass Digenea

Helicometra

- Order Diplostomida
- Order Plagiorchiida

Phylum Gastrotricha

No classes

Order Chaetonotida
Order Macrodasyida

Superphylum Lophotrochozoa

Phylum Mollusca

Phylum Annelida

Kryptotrochozoa (unranked)

Phylum Nemertea

Class Anopla
- Order Heteronemertea
- Order Palaeonemertea
Class Enopla
- Order Bdellonemertea
- Order Hoplonemertea

Lophophorata (unranked)

Brachiozoa (unranked)
- Phylum Hyolitha †
  - Order Hyolithida
  - Order Orthothecida
- Phylum Brachiopoda
  - Class Lingulata
    - Order Lingulida
    - Order Discinida
  - Class Craniata/Craniforma
    - Order Craniida
  - Class Rhynchonellata
    - Order Terebratulida
    - Order Rhynchonellida
- Phylum Phoronida

No classes, no orders, family Phoronidae

Bryozoa (unranked)
- Phylum Ectoprocta
  - Class Gymnolaemata
    - Order Cheilostomata
    - Order Ctenostomata
  - Class Phylactolaemata
    - Order Plumatellida
  - Class Stenolaemata
    - Order Cryptostomata †
    - Order Cryptostomida †
    - Order Cyclostomatida
    - Order Cystoporata †
    - Order Cystoporida †
    - Order Esthonioporata †
    - Order Fenestrida †
    - Order Hederellida †
    - Order Melicerititida †
    - Order Rhabdomesida †
    - Order Trepostomatida †
- Phylum Entoprocta

No classes, no orders, families Barentsiidae, Loxokalypodidae, Loxosomatidae and Pedicellinidae

References

Amin, O. A; Heckmann, R. A; Ha, N. V. (2014). "Acanthocephalans from fishes and amphibians in Vietnam, with descriptions of five new species. '". Parasite. 21: 53. doi:10.1051/parasite/2014052. PMC 4204126. PMID 25331738.

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[1] Amin, O. A; Heckmann, R. A; Ha, N. V. (2014). "Acanthocephalans from fishes and amphibians in Vietnam, with descriptions of five new species. '". Parasite. 21: 53. doi:10.1051/parasite/2014052. PMC 4204126. PMID 25331738.