Gravigrada is the name of a suborder of Mammals established by the French naturalist Henri-Marie Ducrotay de Blainville in 1839, within the order Quaternates

Quaternates

An obsolete order of Mammals created by Henri-Marie Ducrotay de Blainville in 1839, imitating Linnean nomenclature . It included the suborders Gravigrada, Pachydermata and Ruminantia.-References:...

. He included three genera in the suborder: Elephas

Elephas

Elephas is one of two surviving genera in the order of elephants, Proboscidea. The genus has one surviving species, the Asian elephant Elephas maximus....

, Dinotherium and Manatus (Trichechus).

The name is no longer considered valid, as the animals that were included within Gravigrada are now believed to belong to two different orders, Sirenia

Sirenia

Sirenia is an order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. Four species are living, in two families and genera. These are the dugong and manatees...

 and Proboscidea

Proboscidea

Proboscidea is a taxonomic order containing one living family, Elephantidae, and several extinct families. This order was first described by J. Illiger in 1881 and encompasses the trunked mammals...

.