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2025 abstract_background absurd_res algae ambiguous_feral ambiguous_gender aquatic blue_body brown_eyes combos-n-doodles feral fin fish heterostracan hi_res jawless_fish multicolored_body orange_body prehistoric_species pteraspidid pteraspidomorph pteraspis pupils purple_body purple_fin shaded solo swimming tail tail_fin water white_body white_spikes