| Cyathaspis | |
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| Reconstruction ofC. banksii | |
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| Genus: | Cyathaspis Lankester |
| Type species | |
| Pteraspis banksii Huxley and Salter, 1856 | |
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Cyathaspis is thetype genus of theheterostracanorderCyathaspidiformes.[1] Fossils are found in lateSilurian strata in theCunningham Creek Formation, New Brunswick, Canada andEurope, especially in theDownton Castle Sandstone ofGreat Britain andGotland,Sweden.[citation needed] The living animal would have looked superficially like atadpole, albeit covered in bony plates composed of the tissue aspidine, which is unique to heterostracan armor.[citation needed]
Cyathaspis ludensis is the earliest British vertebrate fossil.[citation needed] It was found in rocks atLeintwardine in Herefordshire, a noted fossil locality.[citation needed]
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