Orthacodontidae (also spelled Orthacodidae) is an extinct family of sharks. It is disputed as to whether it belongs to the modern shark order Hexanchiformes, or the extinct order Synechodontiformes. It contains three genera. Some other authors included it in Lamniformes. More recent studies have generally favored its placement in the Hexanchiformes.
Species Archaeogracilidens Villalobos-Segura et al. 2025 Archaeogracilidens macer (Quenstedt, 1852) Occitanodus Guinot, Cappetta & Adnet, 2014 Occitanodus sudrei Guinot, Cappetta & Adnet, 2014 Sphenodus Agassiz, 1843 (Nomen dubium) Sphenodus alpinus Gümbel, 1861 Sphenodus longidens Agassiz, 1843 Sphenodus lundgreni Davis, 1890 Sphenodus planus Agassiz, 1843 Sphenodus rectidens Emmons, 1858 Sphenodus robustidens Seguenza, 1900 Sphenodus tithonius Gemmellaro, 1871 Sphenodus virgai Gemmellaro, 1871
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