Sifrhippus is an extinct genus of equid containing the species S. sandrae. Sifrhippus is the oldest known equid, living during the early Eocene. Its fossils...

†Propalaeotheriinae? Genus †Orohippus Genus †Pliolophus Genus †Protorohippus Genus †Sifrhippus Genus †Xenicohippus Genus †Eurohippus Genus †Propalaeotherium? Subfamily...

have been placed in several other genera, such as Arenahippus, Minippus, Sifrhippus, Xenicohippus, Pliolophus, Protorohippus and the resurrected Eohippus...

Haplohippus Heptaconodon Pliolophus Propalaeotherium Protorohippus Orohippus Sifrhippus Xenicohippus Anchitheriinae Anchitherium Archaeohippus Desmatippus Hypohippus...

Haplohippus Heptaconodon Pliolophus Propalaeotherium Protorohippus Orohippus Sifrhippus Xenicohippus Anchitheriinae Anchitherium Archaeohippus Desmatippus Hypohippus...

oldest finds from an extant group originate among other sources, from Sifrhippus, an ancestor of the horses from the Willswood lineup in northwestern Wyoming...

other, basal forms of the order Perissodactyla, such as Hyracotherium or Sifrhippus, some of which were well-studied members of the early equids, what shows...

†Sialia †Sibinia †Sibinia whitneyi – type locality for species †Sifrhippus †Sifrhippus grangeri †Sigaretta †Sigaretta florissantella – type locality for...

†Semanotus Sequoia †Sequoia affinis Serica †Sespia †Sialia †Sibinia †Sifrhippus Sigmodon †Silpha †Silvius †Sinonyx – or unidentified comparable form Sitona...

†Shoshonius †Shoshonius bowni †Shoshonius cooperi †Sialia †Sifrhippus †Sifrhippus grangeri †Sifrhippus sandrae †Sigynorum – type locality for genus †Sigynorum...