2019 absurd_res acanthothoracid ambiguous_gender antiarch aquatic arthrodire biological_illustration bone brachythoracid cladogram creative_commons english_text entelognathus eurycaraspis fish greyscale hi_res jing_lu min_zhu monochrome osteichthyan osteostracan palaeacanthaspid petalichthyid placoderm prehistoric_species qilinyu quasipetalichthyid romundina silurolepid silurolepis simple_background technical_illustration text white_background you-an_zhu
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