Lower Metazoans and Lesser Deuterostomes Order List

Porifera [Phylum]
    Calcarea [Class]
        Baeriida [Order]
        Clathrinida
        Leucosoleniida
        Lithonida
        Murrayonida

    Hexactinellida [Class]
        Amphidiscosida [Order]
        Aulocalycoida
        Hexactinosida
        Lychniscosida
        Lyssacinosida

    Demospongiae [Class]
        Agelasida [Order]
        Astrophorida
        Chondrosida
        Dendroceratida
        Dictyoceratida
        Hadromerida
        Halichondrida
        Halisarcida
        Haplosclerida
        Homosclerophorida
        Poecilosclerida
        Spirophorida
        Verongida
        Verticillitida

Placozoa [Phylum]
        No order designations

Monoblastozoa [Phylum]
        No order designations

Rhombozoa [Phylum]
        Dicyemida [Order]
        Heterocyemida

Orthonectida [Phylum]
        Orthonectida [Order]

Cnidaria [Phylum]
    Anthozoa [Class]
        Actiniaria [Order]
        Alcyonacea
        Antipatharia
        Ceriantharia
        Corallimorpharia
        Helioporacea
        Pennatulacea
        Scleractinia
        Zoanthidea

    Hydrozoa [Class]
        Actinulida [Order]
        Capitata
        Conica
        Cystonectae
        Filifera
        Laingiomedusae
        Limnomedusae
        Moerisiida
        Narcomedusa
        Proboscoida
        Physonectae
        Polypodiozoa
        Trachymedusa

    Cubozoa [Class]
        Cubomedusae [Order]

    Scyphozoa [Class]
        Coronatae [Order]
        Rhizostomeae
        Semaeostomeae
        Stauromedusae

Ctenophora [Phylum]
        Beroida [Order]
        Cestida
        Cydippida
        Ganeshida
        Lobata
        Platyctenida
        Thalassocalycida

Platyhelminthes [Phylum]
    Acoela [Class]
        No order designations

    Turbellaria [Class]
        Catenulida [Order]
        Haplopharyngida
        Lecithoepitheliata
        Macrostomida
        Polycladida
        Prolecithophora
        Proplicastomata
        Proseriata
        Rhabdocoela
        Tricladida

    Trematoda [Class]
        Aspidogastrida [Order]
        Azygiida
        Echinostomida
        Opisthorchiida
        Plagiorchiida
        Strigeatida

    Monogenea [Class]
        Monopisthocotylea [Order]
        Polyopisthocotylea

    Cestoda [Class]
        Amphilinidea [Order]
        Caryophyllidea
        Cyclophyllidea
        Diphyllidea
        Gyrocotylidea
        Haplobothriidea
        Lecanicephalidea
        Litobothriidea
        Nippotaeniidea
        Proteocephalidea
        Pseudophyllidea
        Spathebothriidea
        Tetrabothriidea
        Tetraphyllidea
        Trypanorhyncha

Nemertea [Phylum]
    Anopla [Class]
                 Heteronemertea [Order]
        Palaeonemertea

    Enopla [Class]
        Hoplonemertea [Order]

Rotifera [Phylum]
        Bdelloida [Order]
        Collothecacea
        Flosculariacea
        Ploimida
        Seisonida

Gastrotricha [Phylum]
        Chaetonotida [Order]
        Macrodasyida

Kinorhyncha [Phylum]
        Cyclorhagida [Order]
        Homalorhagida

Nematoda [Phylum]
    Adenophorea [Class]
        Araeolaimida [Order]
        Chromadorida
        Desmodorida
        Desmoscolecida
        Dorylaimida
        Enoplida
        Isolaimida
        Mermithida
        Monhysterida
        Mononchida
        Muspiceida
        Stichosomida
        Trichocephalida

    Secernentea [Class]
        Aphelenchida [Order]
        Ascaridida
        Camallanida
        Diplogasterida
        Rhabditida
        Spirurida
        Strongylida
        Tylenchida

Nematomorpha [Phylum]
        Gordioidea [Order]
        Nectonematoidea

Acanthocephala [Phylum]
        Apororhynchida [Order]
        Echinorhynchida
        Gigantorhynchida
        Gyracanthocephala
        Moniliformida
        Neoechinorhynchida
        Oligacanthorhynchida
        Polymorphida

Entoprocta [Phylum]
        Coloniales [Order]
        Solitaria

Micrognathozoa [Phylum]
        Limnognathida [Order]

Gnathostomulida [Phylum]
        Bursovaginoidea [Order]
        Filospermoidea

Priapulida [Phylum]
        Halicryptomorphida [Order]
        Priapulimorphida
        Seticoronarida

Loricifera [Phylum]
        Nanaloricida [Order]

Cycliophora [Phylum]
        Symbiida [Order]

Echinodermata [Phylum]
    Crinoidea [Class]
        Bourgueticrinida [Order]
        Comatulida
        Cyrtocrinida
        Isocrinida
        Millericrinida

    Asteroidea [Class]
        Brisingida [Order]
        Forcipulatida
        Notomyotida
        Paxillosida
        Spinulosida
        Valvatida
        Velatida

    Concentricycloidea [Class]
        Peripodida [Order]

    Ophiuroidea [Class]
        Euryalida [Order]
        Oegophiurida
        Ophiurida

    Echinoidea [Class]
        Arbacioida [Order]
        Cassiduloida
        Cidaroida
        Clypeasteroida
        Diadematoida
        Echinoida
        Echinothuroida
        Holasteroida
        Holectypoida
        Pedinoida
        Phymosomatoida
        Salenoida
        Spatangoida
        Temnopleurida

    Holothuroidea [Class]
        Apodida [Order]
        Aspidochirotida
        Dactylochirotida
        Dendrochirotida
        Elasipodida
        Molpadiida

Chaetognatha [Phylum]
        Aphragmophora [Order]
        Phragmophora

Hemichordata [Phylum]
        Cephalodiscida [Order]
        Rhabdopleurida

Chordata [Phylum]
  Urochordata [Subphylum]
    Ascidiacea [Class]
        Enterogona [Order]
        Pleurogona

    Thaliacea [Class]
        Doliolida [Order]
        Pyrosomatida
        Salpida

    Appendicularia [Class]
        Copelata [Order]

    Sorberacea [Class]
        Aspiraculatav [Order]

  Cephalochordata [Subphylum]
        Amphioxiformes [Order]