?See text Eomesodon (Greek for "dawn Mesodon", Mesodon being a now-disused pycnodont genus) is an extinct genus of prehistoric marine pycnodont fish.

[1][2] It contains only a single definitive species, E. liassicus (Egerton, 1854) from the Early Jurassic (Hettangian to Sinemurian) of England (Lower Lias), France, and Belgium (Marnes de Jamoigne Formation).

[4] In addition to E. liassicus, several other disputed species are known from earlier (Late Triassic) and much later (up to the earliest Cretaceous).

If the Triassic species actually did belong to this genus, then Eomesodon would be the only pycnodont known from both sides of the Triassic-Jurassic boundary.

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