Orthacodontidae

Orthacodontidae (also spelled Orthacodidae^[1]) is an extinct family of sharks. It is disputed as to whether it belongs to the modern shark order Hexanchiformes,^[2] or the extinct order Synechodontiformes.^[3] It contains two genera. Some other authors included it in Lamniformes.^[4]

Orthacodontidae Temporal range: Early Jurassic–Paleocene PreꞒ Ꞓ O S D C P T J K Pg N
The head of a Sphenodus nitidus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Family:	†Orthacodontidae Glikman, 1957
Genera
Occitanodus Guinot, Cappetta & Adnet, 2014 Sphenodus Agassiz, 1843 Archaeogracilidens Villalobos-Segura et al. 2025

Species

• Occitanodus Guinot, Cappetta & Adnet, 2014
  • Occitanodus sudrei Guinot, Cappetta & Adnet, 2014
• Sphenodus Agassiz, 1843 (Possibly a nomen dubium)^[5]
  • Sphenodus alpinus Gümbel, 1861
  • Sphenodus longidens Agassiz, 1843
  • Sphenodus lundgreni Davis, 1890
  • Sphenodus macer Quenstedt, 1852?
  • Sphenodus nitidus Wagner, 1862?
  • Sphenodus planus Agassiz, 1843
  • Sphenodus rectidens Emmons, 1858
  • Sphenodus robustidens Seguenza, 1900
  • Sphenodus tithonius Gemmellaro, 1871
  • Sphenodus virgai Gemmellaro, 1871
• Archaeogracilidens Villalobos-Segura et al. 2025
  • Archaeogracilidens macer Quenstedt, 1852