Galeaspida
Galeaspida (galeaspids) are an extinct taxon of jawless marine fish and a subgroup of the Cephalaspidomorphi, which are itself a subgroup of the vertebrate.
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They lived in Silurian and Devonian times (430 to 370 million years ago). All fossils were found in Asia.
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Galeaspids are separated in Eugaleaspidiformes and Polybranchiaspidida.
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The name Galeaspida is derived from a latin word for helmet, galea. This refers to their massive bone shield on the head.
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