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List of bilaterian orders

List of bilaterian orders is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of bilaterian orders rather than just read about it. In short: Bilateria is an extremely diverse group of animals containing a vast majority of its species, largely due to the enormous amount of arthropods. This article is a list of orders contained within Bilateria separated by phylum.

List of bilaterian orders — main illustration
List of bilaterian orders — illustration

Key takeaways

  • List of bilaterian orders belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect List of bilaterian orders to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of List of bilaterian orders from memory before moving on to harder problems.

Reference excerpt

Bilateria is an extremely diverse group of animals containing a vast majority of its species, largely due to the enormous amount of arthropods. This article is a list of orders contained within Bilateria separated by phylum. Groups that are not contained within an order are listed separately.

List

Phylum Annelida

Annelid taxonomy is currently under constant revisions due to the discovery that the class Polychaeta is paraphyletic. As such, a comprehensive list of orders is likely to change depending on what is accepted as valid.

Amphinomida Class Sipuncula

Aspidosiphonida Golfingiida Phascolosomatida Clade Pleistoannelida

Clade Errantia Eunicida Phyllodocida Protodrilida Myzostomida Clade Sedentaria Capitellida Family Capitellidae Subclass Echiura Bonelliida Echiurida Opheliida Orbiniida Sabellida Spionida Terebellida Class Clitellata Branchiobdellida Haplotaxida Lumbriculida Moniligastrida Subclass Hirudinea Rhynchobdellida Arhynchobdellida Unplaced groups

Genus Apistobranchus Suborder Chaetopteriformia Suborder Cirratuliformia Genus Lobatocerebrum Clade Maldanomorpha Clade Paleoannelida Family Polygordiidae Family Siboglinidae

Phylum Arthropoda

See List of arthropod orders

Phylum Brachiopoda

Class Craniata

Craniida Craniopsida † Trimerellida † Subphylum Linguliformea

Class Lingulata Acrotretida † Lingulida Siphonotretida † Class Paterinata Paterinida † Subphylum Rhynchonelliformea

Class Chileata Chileida † Dictyonellida † Class Kutorginata Kutorginida † Class Obolellata Naukatida † Obolellida † Class Rhynchonellata Athyridida † Atrypida † Orthida † Protorthida † Pentamerida † Rhynchonellida Spiriferida † Terebratulida Thecideida Class Strophomenata Billingsellida † Orthotetida † Productida † Strophomenida †

Phylum Bryozoa

Class Gymnolaemata

Cheilostomata Ctenostomatida Class Phylactolaemata

Plumatellida Class Stenolaemata

Cyclostomatida Cryptostomata † Cystoporida † Esthonioporata † Fenestrida † Timanodictyina † Trepostomatida †

Phylum Chaetognatha

Aphragmophora Phragmophora Protoconodonta † Unplaced groups

Genus Capinatator Genus Eognathacantha Genus Protodagitta Genus Timorebestia

Phylum Chordata

See List of chordate orders

Phylum Cycliophora

Class Eucycliophora

Symbiida

Phylum Dicyemida

Dicyemida does not contain any established orders but does contain three families: Conocyemidae, Dicyemidae and Kantharellidae.

Phylum Echinodermata

See List of echinoderm orders

Phylum Entoprocta

Entoprocta has no orders but is split into four families; Barentsiidae, Pedicellinidae, Loxokalypodidae, and Loxosomatidae.

Phylum Gastrotricha

Chaetonotida Macrodasyida

Phylum Gnathostomulida

Bursovaginoidea Filospermoidea

Phylum Hemichordata

The classes Planctosphaeroidea and Enteropneusta do not contain any orders. Class Pterobranchia

Cephalodiscida Subclass Graptolithina Rhabdopleurida Dendroidea † Graptoloidea † Unplaced groups

Family Cysticamaridae Family Wimanicrustidae Family Dithecodendridae Family Cyclograptidae

Phylum Kinorhyncha

Class Cyclorhagida

Echinorhagata Kentrorhagata Xenosomata Class Allomalorhagida

Anomoirhaga Unplaced groups

Genus Eokinorhynchus Family Pycnophyidae

Phylum Loricifera

Loricifera has no classes and all species are contained within one order.

Nanaloricida

Phylum Micrognathozoa

Micrognathozoa has no classes. Its two species are placed in one order.

Limnognathida

Phylum Mollusca

See List of mollusc orders

Phylum Nematoda

Nematode taxonomy is far from fully resolved, and different schemes might be used. For this list, Mike Hodda's Phylum Nematoda: a classification, catalogue and index of valid genera, with a census of valid species classification is used. Class Enoplea

Subclass Enoplia Superorder Enoplica Alaimida Enoplida Ironida Trefusiida Tripyloidida Superorder Rhaptothyreica Rhaptothyreida Subclass Oncholaimia Oncholaimida Subclass Triplonchia Triplonchida Tripylida Class Dorylaimea

Subclass Dorylaimia Dorylaimida Subclass Bathyodontia Bathyodontida Mononchida Mermithida Subclass Trichocephalia Trichocephalida Marimermithida Dioctophymatida Muspiceida Class Chromadorea

Subclass Chromadoria Chromadorida Selachinematida Desmodorida Desmoscolecida Subclass Plectia Superorder Monhysterica Monhysterida Superorder Plectica Leptolaimida Plectida Benthimermithida Superorder Teratocephalica Teratocephalida Superorder Rhabditica Diplogasterida Rhabditida Spirurida Rhigonematida Panagrolaimida Drilonematida

Phylum Nematomorpha

Gordioidea Nectonematoidea

Phylum Nemertea

Class Hoplonemertea

Monostilifera Polystilifera Class Palaeonemertea

Archinemertea Carinomiformes Tubulaniformes Class Pilidiophora

Heteronemertea

Phylum Onychophora

Onychophora contains no classes and no orders, but is split into two living families; Peripatidae and Peripatopsidae, and 5 extinct genera; Antennacanthopodia, Antennipatus, Helenodora, Succinipatopsis, and Tertiapatus.

Phylum Orthonectida

Orthonectida contains no classes or orders, but is split into two families; Pelmatosphaeridae and Rhopaluridae.

Phylum Phoronida

Phoronida contains no classes, orders, or families, but is split into two genera; Phoronis and Phoronopsis.

Phylum Platyhelminthes

The class Catenulida contains no orders. Subphylum Rhabditophora

Clade Macrostomorpha Macrostomida Clade Trepaxonemata Gnosonesimida Clade Amplimatricata Lecithoepitheliata Polycladida Clade Euneoophora Proseriata Rhabdocoela Clade Acentrosomata Clade Adiaphanida Prolecithophora Fecampiida Tricladida Clade Bothrioneodermata Bothrioplanida Superclass Neodermata Class Cestoda Subclass Cestodaria Amphilinidea Gyrocotylidea Subclass Eucestoda Spathebothriidea Caryophyllidea Haplobothriidea Diphyllobothriidea Diphyllidea Trypanorhyncha Bothriocephalidea Litobothriidea Lecanicephaloidea Rhinebothriidea Tetraphyllidea Onchoproteocephalidea Nippotaeniidea Tetrabothriidea Cyclophyllidea Class Monogenea Subclass Monopisthocotylea Monocotylidea Capsalidea Lagarocotylidea Montchadskyellidea Gyrodactylidea Dactylogyridea Subclass Polyopisthocotylea Polystomatidea Chimaericolidea Diclybothriidea Mazocraeidea Class Trematoda Subclass Aspidogastrea Aspidogastrida Stichocotylida Subclass Digenea Diplostomida Plagiorchiida Unplaced groups

Genus Haplopharynx

Phylum Priapulida

Several stem group priapulid genera are not classified within any established orders. The orders listed below are solely crown priapulids.

Halicryptomorphida Priapulimorphida Meiopriapulomorpha Seticoronaria

Phylum Rotifera

… excerpt ends here. Continue reading the full article.

Illustrations

List of bilaterian orders: The relative number of species contributed to the total by each phylum of animals. Arthropoda is the phylum with the most individual organisms.
The relative number of species contributed to the total by each phylum of animals. Arthropoda is the phylum with the most individual organisms.
List of bilaterian orders: Hirudo medicinalis. Order Arhynchobdellida
Hirudo medicinalis. Order Arhynchobdellida
List of bilaterian orders: The house fly. Order Diptera
The house fly. Order Diptera
List of bilaterian orders: Terebratalia transversa. Order Terebratulida
Terebratalia transversa. Order Terebratulida
List of bilaterian orders: A colony of Membranipora membranacea. Order Cheilostomatida
A colony of Membranipora membranacea. Order Cheilostomatida

Worked examples

Example 1 — a first encounter with List of bilaterian orders

Start with the simplest possible case. Write down what List of bilaterian orders claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of bilaterian orders before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of bilaterian orders ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of bilaterian orders

In research
List of bilaterian orders appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses List of bilaterian orders in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
List of bilaterian orders is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bilateria orders, Taxonomic lists (orders), so understanding it makes those chapters shorter.
In everyday life
Look for List of bilaterian orders outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study List of bilaterian orders in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what List of bilaterian orders means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain List of bilaterian orders out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of bilaterian orders in simple terms?

Bilateria is an extremely diverse group of animals containing a vast majority of its species, largely due to the enormous amount of arthropods. This article is a list of orders contained within Bilateria separated by phylum.

Why does List of bilaterian orders matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of bilaterian orders?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of bilaterian orders.

Tags

  • Bilateria orders
  • Taxonomic lists (orders)

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