旋齿鲨科
{{Automatic taxobox | taxon = Helicoprionidae | fossil_range = 早石炭紀-晚二疊紀 | image = Helicoprion reccon.png | authority = Karpinsky, 1911 | type_species = Helicoprion bessonowi | type_species_authority = Karpinsky, 1899 | …
标签：#尤金齿目
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