Exutaspis megista is an extinct, "giant" buchanosteid arthrodire placoderm. Its fossils have been found in the Late Emsian-aged marine strata of the Jiucheng and Haikou Formations in Wuding, Yunnan.
| Exutaspis Temporal range:
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| Family: | White, 1952
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| Genus: | Exutaspis
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| Species: | E. megista
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| Exutaspis megista Liu & Wang, 1981
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It was originally described as a phlyctaeniid. Later, after comparison with the Chinese Buchanosteus guanxianesis, Exutaspis was reappraised as a buchanosteid. The holotype, a "head roof," is 21 cm (8.3 in) long.
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