| Anaspida | Endeiolepidiformes | Eldeiolepididae †Endeiolepis |
|  Anaspida | Birkeniiformes †Cowielepis |
| Anaspida | Birkeniiformes †Hoburgilepis |
| Anaspida | Birkeniiformes †Kerreralepis |
| Anaspida | Birkeniiformes †Maurylepis |
| Anaspida | Birkeniiformes †Rytidolepis |
| Anaspida | Birkeniiformes †Schidiosteus |
| Anaspida | Birkeniiformes †Silmalepis |
| Anaspida | Birkeniiformes †Vesikulepis |
|  Anaspida | Birkeniiformes | Pharyngolepididae †Pharyngolepis |
|  Anaspida | Birkeniiformes | Pterygolepididae †Pterygolepis |
|  Anaspida | Birkeniiformes | Rhyncholepididae †Rhyncholepis |
| Anaspida | Birkeniiformes | Tahulalepididae †Tahulalepis |
| Anaspida | Birkeniiformes | Tahulalepididae †Trimpleylepis |
|  Anaspida | Birkeniiformes | Lasaniidae †Lasanius |
| Anaspida | Birkeniiformes | Ramsaasalepididae †Ramsaasalepis |
| Anaspida | Birkeniiformes | Birkeniidae †Vilkitskilepis |
| Anaspida | Birkeniiformes | Birkeniidae †Ctenopleuron |
| Anaspida | Birkeniiformes | Birkeniidae †Saarolepis |
|  Anaspida | Birkeniiformes | Birkeniidae †Birkenia |
| Anaspida | Birkeniiformes | Septentrioniidae †Liivilepis |
| Anaspida | Birkeniiformes | Septentrioniidae †Manbrookia |
| Anaspida | Birkeniiformes | Septentrioniidae †Ruhnulepis |
| Anaspida | Birkeniiformes | Septentrioniidae †Spokoinolepis |
| Anaspida | Birkeniiformes | Septentrioniidae †Septentrionia |
| Pteraspidomorphi †Anatolepis |
| Pteraspidomorphi | Arandaspida | Aseraspididae †Aseraspis |
| Pteraspidomorphi | Arandaspida | Arandaspididae †Andinaspis |
| Pteraspidomorphi | Arandaspida | Arandaspididae †Adepolepis |
|  Pteraspidomorphi | Arandaspida | Arandaspididae †Arandaspis |
| Pteraspidomorphi | Arandaspida | Arandaspididae †Areyongalepis |
|  Pteraspidomorphi | Arandaspida | Arandaspididae †Sacabambaspis |
|  Pteraspidomorphi | Heterostracomorphi | Astraspida | Astraspididae †Astraspis |
| Pteraspidomorphi | Heterostracomorphi | Astraspida | Tesakoviaspididae †Tesakoviaspis |
| Pteraspidomorphi | Heterostracomorphi | Eriptychiida | Eriptychiidae †Eriptychius |
| Pteraspidomorphi | Heterostracomorphi | Eriptychiida | Oniscolepididae †Kallostrakon |
| Pteraspidomorphi | Heterostracomorphi | Eriptychiida | Oniscolepididae †Oniscolepis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci †Weigeltaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Tesseraspidiformes †Tesseraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Traquairaspidiformes | Phialaspididae †Phialaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Traquairaspidiformes | Traquairaspididae †Traquairaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Traquairaspidiformes | Weigeltaspididae †Weigeltaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Tolypelepidiformes †Asketaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Tolypelepidiformes †Athenaegis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Tolypelepidiformes †Tolypelepis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ariaspidae †Anglaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ariaspidae †Ariaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ariaspidae †Liliaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ariaspidae †Listraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ariaspidae †Paraliliaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Alainaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Allocryptaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Arctictenaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Boothiaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Ctenaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Ctenaspididae †Zaphoctenaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Cyathaspidae †Capitaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Cyathaspidae †Cyathaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Cyathaspidida | Cyathaspidae †Poraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Amphiaspididae †Amphiaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Amphiaspididae †Amphoraspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Edaphaspididae †Edaphaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Gabreyaspididae †Gabreyaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Gabreyaspididae †Pelaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Gabreyaspididae †Prosarctaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Gabreyaspididae †Tareyaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Olbiaspididae †Angaraspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Olbiaspididae †Kureykaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Amphiaspidoidei | Olbiaspididae †Olbiaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Aphataspididae †Aphataspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Aphataspididae †Putoranaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Eglonaspididae †Eglonaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Eglonaspididae †Empedaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Eglonaspididae †Gerronaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Eglonaspididae †Lecaniaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Eglonaspididae †Pelurgaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Hibernaspidoidei | Hibernaspididae †Hibernaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Siberiaspidoidei | Siberiaspididae †Argyriaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Siberiaspidoidei | Siberiaspididae †Siberiaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Siberiaspidoidei | Tuxeraspididae †Dotaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Siberiaspidoidei | Tuxeraspididae †Litotaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cyathaspidiformes | Amphiaspidida | Siberiaspidoidei | Tuxeraspididae †Tuxeraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Cardipeltida | Cardipeltiformes | Cardipeltidae †Cardipeltis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Anchipteraspididae †Anchipteraspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Anchipteraspididae †Rhachiaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Anchipteraspididae †Ulutitaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Protopteraspididae †Protopteraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Protopteraspididae †Doryaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Psammosteida | Psammosteidae †Drepanaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Psammosteida | Psammosteidae †Psammolepis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Psammosteida | Psammosteidae †Pycnosteus |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei †Palanasaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Gigantaspididae †Gigantaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Althaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Blieckaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Errivaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Pteraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Larnovaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Podolaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Pteraspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Pteraspididae †Rhinopteraspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Protaspis |
|  Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Cosmaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Lampraspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Europrotaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Cyrtaspidichthys |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Oreaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Psephaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Rodenaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Tuberculaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Xylaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Zascinaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Woodfjordaspis |
| Pteraspidomorphi | Heterostracomorphi | Heterostraci | Pteraspidiformes | Pteraspidoidei | Protaspididae †Pirumaspis |
| Thelodonti | Thelodontiformes | Coelolepidae †Coelolepis |
| Thelodonti | Thelodontiformes | Coelolepidae †Larolepis |
|  Thelodonti | Thelodontiformes | Coelolepidae †Thelodus |
| Thelodonti | Thelodontiformes | Eestilepididae †Eestilepis |
|  Thelodonti | Thelodontiformes | Loganellidae †Loganellia |
| Thelodonti | Thelodontiformes | Longodidae †Longodus |
| Thelodonti | Thelodontiformes | Palaeodontidae †Palaeodus |
| Thelodonti | Thelodontiformes | Palaeodontidae †Archodus |
| Thelodonti | Thelodontiformes | Phlebolepididae †Erepsilepis |
|  Thelodonti | Thelodontiformes | Phlebolepididae †Phlebolepis |
|  Thelodonti | Archipelepidiformes | Archipelepididae †Archipelepis |
| Thelodonti | Furcacaudiformes | Drepanolepididae †Drepanolepis |
| Thelodonti | Furcacaudiformes | Furcacaudidae †Canonia |
| Thelodonti | Furcacaudiformes | Furcacaudidae †Sphenonectris |
| Thelodonti | Furcacaudiformes | Furcacaudidae †Cometicercus |
|  Thelodonti | Furcacaudiformes | Furcacaudidae †Furcacauda |
|  Galeaspida | Hanyangaspididae †Hanyangaspis |
|  Galeaspida | Xiushuiaspididae †Changxingaspis |
| Galeaspida | Xiushuiaspididae †Xiushuiaspis |
|  Galeaspida | Dayongaspididae †Dayongaspis |
| Galeaspida | Eugaleaspidiformes †Yongdongaspis |
|  Galeaspida | Eugaleaspidiformes | Shuyuidae †Shuyu |
|  Galeaspida | Eugaleaspidiformes | Sinogaleaspididae †Sinogaleaspis |
|  Galeaspida | Eugaleaspidiformes | Sinogaleaspididae †Rumporostralis |
|  Galeaspida | Eugaleaspidiformes | Eugaleaspididae †Dunyu |
|  Galeaspida | Eugaleaspidiformes | Eugaleaspididae †Nochelaspis |
| Galeaspida | Polybranchiaspidida | Gumuaspididae †Gumuaspis |
|  Galeaspida | Polybranchiaspidida | Gumuaspididae †Laxaspis |
| Galeaspida | Polybranchiaspidida | Duyunolepididae †Duyunolepis |
|  Galeaspida | Polybranchiaspidida | Duyunolepididae †Foxaspis |
| Galeaspida | Polybranchiaspidida | Polybranchiaspididae †Polybranchiaspis |
|  Galeaspida | Polybranchiaspidida | Polybranchiaspididae †Bannhuanaspis |
| Galeaspida | Huananaspidiformes | Gantarostrataspidae †Gantarostrataspis |
|  Galeaspida | Huananaspidiformes | Gantarostrataspidae †Rhegmaspis |
| Galeaspida | Huananaspidiformes | Huananaspidae †Huanaspis |
|  Galeaspida | Huananaspidiformes | Huananaspidae †Asiaspis |
| Galeaspida | Huananaspidiformes | Huananaspidae | Macrothyraspinae †Macrothyraspis |
|  Galeaspida | Huananaspidiformes | Huananaspidae | Macrothyraspinae †Lungmenshanaspis |
|  Pituriaspida | Pituriaspididae †Pituriaspis |
|  Pituriaspida | Pituriaspididae †Neeyambaspis |
|  Osteostraci †Hemicyclaspis |
|  Osteostraci †Cephalaspis |
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| Osteostraci †Waengsjoeaspis |
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| Osteostraci | Ateleaspididae †Hirella |
| Osteostraci | Ateleaspididae †Aceraspis |
|  Osteostraci | Ateleaspididae †Ateleaspis |
| Osteostraci | Zenaspida †Spangenhelmaspis |
|  Osteostraci | Zenaspida †Wladysagitta |
| Osteostraci | Zenaspida | Parameteoraspididae †Parameteoraspis |
| Osteostraci | Zenaspida | Parameteoraspididae †Balticaspis |
| Osteostraci | Zenaspida | Parameteoraspididae †Trewinia |
| Osteostraci | Zenaspida | Parameteoraspididae †Escuminaspis |
| Osteostraci | Zenaspida | Parameteoraspididae †Levesquaspis |
| Osteostraci | Zenaspida | Zenaspididae †Tegaspis |
| Osteostraci | Zenaspida | Zenaspididae †Stensiopelta |
| Osteostraci | Zenaspida | Zenaspididae †Diademaspis |
|  Osteostraci | Zenaspida | Zenaspididae †Zenaspis |
| Osteostraci | Zenaspida | Zenaspididae †Scolenaspis |
| Osteostraci | Zenaspida | Zenaspididae †Ukrainaspis |
| Osteostraci | Zenaspida | Zenaspididae †Machairaspis |
| Osteostraci | Zenaspida | Zenaspididae †Superciliaspis |
|  Osteostraci | Zenaspida | Zenaspididae †Janaspis |
| Osteostraci | Benneviaspididae †Ectinaspis |
| Osteostraci | Benneviaspididae †Securiaspis |
| Osteostraci | Benneviaspididae †Benneviaspis |
|  Osteostraci | Benneviaspididae | Boreaspidoidei †Hoelaspis |
| Osteostraci | Benneviaspididae | Boreaspidoidei †Severaspis |
|  Osteostraci | Benneviaspididae | Boreaspidoidei †Boreaspis |
| Osteostraci | Benneviaspididae | Boreaspidoidei †Dicranaspis |
| Osteostraci | Benneviaspididae | Boreaspidoidei †Spatulaspis |
| Osteostraci | Benneviaspididae | Boreaspidoidei †Belonaspis |
| Osteostraci | Benneviaspididae | Boreaspidoidei †Hapilaspis |
|  Osteostraci | Benneviaspididae | Boreaspidoidei †Tauraspis |
| Osteostraci | Thyestiida †Ilemoraspis |
| Osteostraci | Thyestiida †Procephalaspis |
|  Osteostraci | Thyestiida †Auchenaspis |
|  Osteostraci | Thyestiida †Thyestes |
| Osteostraci | Thyestiida †Witaaspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Saaremaspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Tyriaspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Aestiaspis |
|  Osteostraci | Thyestiida | Tremataspidoidea †Dartmuthia |
| Osteostraci | Thyestiida | Tremataspidoidea †Timanaspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Oeselaspis |
|  Osteostraci | Thyestiida | Tremataspidoidea †Tremataspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Dobraspis |
| Osteostraci | Thyestiida | Tremataspidoidea †Sclerodus |
| Osteostraci | Thyestiida | Tremataspidoidea †Tannuaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Didymaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Kiaeraspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Noreslaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Nectaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Axinaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Acrotomaspis |
| Osteostraci | Thyestiida | Kiaeraspidoidea †Gustavaspis |
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