2019 acanthodes acanthodian acanthodid acanthodiform actinopterygian ambiguous_gender aquatic australian_ghostshark biological_illustration bone bothriolepidid bothriolepis callorhinchus chimaeriform chondrichthyan christopher_stockey cladogram cowralepis creative_commons debeeriid debeeriiform debeerius elasmobranch english_text falcatid feral fin fish ghedoghedo gladbachus glyptolepis_(fish) gnathostome ground_shark holocephalan holoptychiid lobe-finned_fish martin_d._brazeau milton_tan open_mouth osteichthyan ozarcus paraplesiobatid paraplesiobatis phyllolepid phyllolepidid phylogenetic_tree placoderm porolepiform prehistoric_species pseudopetalichthyid ptomacanthus raynerius_(fish) richard_p._dearden scyliorhinid scyliorhinus shark silhouette simple_background spiny_shark symmoriiform technical_illustration text tony_ayling triodus white_background xenacanthid xenacanthiform
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