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|Noun||1.||Heterostraci - extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear|
animal order - the order of animals
order Ostracodermi, Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear
heterostracan - extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
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