Hibernaspidoidei

Hibernaspidoidei is a taxon of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, hibernaspid amphiaspidids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. All amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked like a potpie or a hot waterbottle with a pair of small, or degenerated eyes, a pair of branchial openings for exhaling, and, in the case of hibernaspids, a simple, slit-like mouth at the anterior end of a tube-like head.

Hibernaspidoidei contains three families.

This family is monotypic, containing only the genus Hibernaspis.

This is a diverse family that contains five monotypic genera, including Eglonaspis, Gerronaspis, Lecaniaspis, Empedaspis, and Pelurgaspis.

This family contains two monotypic genera, Aphataspis and Putoranaspis.

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Pteraspidomorphi

• Kingdom: Animalia
• Phylum: Chordata
• Subphylum: Vertebrata

Pteraspidomorphi
Pteraspidomorphi Anatolepis Arandaspida Arandaspidiformes Astraspididae Astraspis Arandaspididae Andinaspis Apedolepis Arandaspis Areyongalepis Pircanchaspis Porophoraspis Ritchieichthys Sacabambaspis Heterostracomorphi Astraspida Astraspidiformes Astraspididae Astraspis Pycnaspis Tesakoviaspidida Tesakoviaspididae Kodinskaspis Tesakoviaspis Eriptychiida Eriptychiiformes Eriptychiidae Eleochera Eriptychiidae Eriptychius Oniscolepididae Kallostrakon Oniscolepis Heterostraci see below↓

Heterostraci
Heterostraci Cyathaspidiformes see below↓ Pteraspidiformes see below↓ Cardipeltida Cardipeltis Lepidaspidida Lepidaspis Corvaspidida Corvaspis Tolypelepidida Asketaspis Athenaegis Tolypelepis Tesseraspidiformes Natlaspis Tesseraspis Traquairaspidiformes Phialaspididae Munchoaspis Phialaspis Toombsaspis Traquairaspididae Pseudotraquairaspis Rimasventeraspis Traquairaspis Weigeltaspididae？ Weigeltaspis

Cyathaspidiformes
Cyathaspidiformes Nakaolinaspis？ Cyathaspidida Cyathaspidae Cyathaspis Americaspis Archegonaspis Capitaspis Dikenaspis Dinaspidella Homaspidella Irregulareaspis Nahanniaspis Pionaspis Poraspis Ptomaspis Seretaspis Steinaspis Torpedaspis Veronaspis Ariaspidae Ariaspis Anglaspis Listraspis Liliaspis Paraliliaspis Ctenaspidae Ctenaspis Allocryptaspis Alainaspis Zaphoctenaspis Arctictenaspis Boothiaspis Amphiaspidida incertae sedis Gunaspis Amphiaspidoidei Amphiaspididae Amphiaspis Amphoraspis Edaphaspididae Edaphaspis Gabreyaspididae Gabreyaspis Prosarctaspis Pelaspis Tareyaspis Olbiaspididae Olbiaspis Kureykaspis Angaraspis Hibernaspidoidei Hibernaspididae Hibernaspis Eglonaspididae Eglonaspis Gerronaspis Lecaniaspis Empedaspis Pelurgaspis Aphataspididae Aphataspis Putoranaspis Siberiaspidoidei Siberiaspididae Siberiaspis Argyriaspis Tuxeraspididae Tuxeraspis Litotaspis Dotaspis

Pteraspidiformes
Pteraspidiformes Anchipteraspididae Anchipteraspis Rhachiaspis Ulutitaspis Podolaspididae Dnestraspis Parapteraspis Semipodolaspis Protopteraspididae Protopteraspis Doryaspis Escharaspis Miltaspis Stegobranchiaspis Unkaraspis "Trygonaspis" Psammosteida Tartuosteus Weigeltaspis？ Drepanaspididae Drepanaspis Guerichosteidae Guerichosteus Hariosteus Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus Rohonosteus Selerolepis Vladimirolepis Obrucheviidae Obruchevia Pteraspidoidei incertae sedis Palanasaspis Pteraspididae Althaspis Blieckaspis Brachipteraspis Errivaspis Escharaspis Grumantaspis Helaspis Larnovaspis Loricopteraspis Miltaspis Mitraspis Mylopteraspidella Mylopteraspis Podolaspis Pteraspis Rhinopteraspis Stegobranchiaspis Gigantaspididae Gigantaspis Protaspididae Protaspis Cosmaspis Lampraspis Europrotaspis Cyrtaspidichthys Oreaspis Psephaspis Rodenaspis Tuberculaspis Xylaspis Zascinaspis Woodfjordaspis Pirumaspis

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