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Arandaspis Temporal range: Early Ordovician 480–470 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Arandaspis prionotolepis from Natural History Museum in London
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Class:	†Pteraspidomorphi
Order:	†Arandaspidiformes
Family:	†Arandaspididae
Genus:	†Arandaspis Ritchie & Gilbert-Tomlinson, 1977
Type species
†Arandaspis prionotolepis Ritchie & Gilbert-Tomlinson, 1977
Species
A. prionotolepis Ritchie & Gilbert-Tomlinson, 1977 A. sp. Young, 1997

Arandaspis prionotolepis is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. Arandaspis is named after a local Indigenous Australian people, the Aranda (now currently called Arrernte).

Description

Arandaspis is estimated to reach around 12–14 cm (5–6 in) long, with a body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. It probably was a filter-feeder. Morphology of trunk and tail is unknown. According to comparison with other early ostracoderms, it would lacked paired fins and caudal fin would be simple shape, although another arandaspid Sacabambaspis had the tail that consist dorsal and ventral webs and an elongated notochordal lobe.

See also

• Astraspis
• Sacabambaspis

References

1. "Pteraspidomorphi". Retrieved 28 October 2013.
2. ^ Ritchie, Alexander; Gilbert-Tomlinson, Joyce (1977). "First Ordovician vertebrates from the Southern Hemisphere". Alcheringa: An Australasian Journal of Palaeontology. 1 (4): 351–368. doi:10.1080/03115517708527770. ISSN 0311-5518.
3. Pradel, Alan; Sansom, Ivan. J; Gagnier, Pierre-Yves; Cespedes, Ricardo; Janvier, Philippe (2006-11-14). "The tail of the Ordovician fish Sacabambaspis". Biology Letters. 3 (1): 73–76. doi:10.1098/rsbl.2006.0557. ISSN 1744-9561. PMC 2373808.

External links

• [REDACTED] Media related to Arandaspis at Wikimedia Commons

v t e 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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• Pteraspidomorphi genera
• Ordovician jawless fish
• Paleozoic fish of Australia
• Early Ordovician genus first appearances
• Early Ordovician genus extinctions
• Fossil taxa described in 1977
• Pteraspidomorphi stubs
• Ordovician animal stubs