of its time. It may be part of a trend among early Cenozoic mammals toward developing more specialized bodies to fill different ecological niches. Species Genus Dissacus Dissacus argenteus Dissacus europaeus Dissacus indigenus Dissacus magushanensis Dissacus navajovius Dissacus praenuntius Dissacus raslanloubatieri Dissacus rotundus Dissacus rougierae Dissacus serior Dissacus serratus Dissacus willwoodensis Dissacus zanabazari Dissacus zengi References Fossils of France Fossils of China Mesonychids Paleocene mammals Eocene mammals Eocene genus extinctions Danian first appearances Fossil taxa described in 1881 Prehistoric placental genera