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Extinct group of armored jawless fishes or fishlike vertebrate
Answer for the clue "Extinct group of armored jawless fishes or fishlike vertebrate ", 12 letters:
heterostraci
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Wikipedia
Word definitions in Wikipedia
Heterostraci ("Different scales") is an extinct subclass of pteraspidomorph jawless vertebrate that lived primarily in marine and estuary environments. The first identifiable heterostracans appear in the fossil record during the early Silurian , and all, ...