What was the first mammal on earth?

Answer 1

Haramiyavia clemmenseni It was named after geologist, Lars Clemmensen who dated the fossiles to 212 mio (late Triassic). It represents the the earliest known haramiyid, an early offspring of the multituberculates - a sister group to therian (or modern) mammals (one theory), or a group of early mammals unrelated to multituberculates (another theory). The find in Eastern Greenland, 1997 was a sensation because it represented the first haramiyid with fully preserved teeth and jaws and other body parts. These showed that the two other haramiyid genums: Haramiya and Thomasia where in fact one animal in that the teeth from these findings represented respectively the lower and upper teeth of the same animal. It also safely placed the haramiyids under the mammals because it's teeth were very mammal-like. Haramiyavia was small, agile, and it's cranium was 4 cm. It had four specialized point-crushing incisors similar to those in rodents and very complex premolars and molars designed for crushing hard food. It was a herbivore and probably seed eating. The extinction of egg-laying haramiyids and multituberculata was probably among other factors due to the competition of the placental true rodents who first appeared 40 mio years ago. With the fetus raised in the placenta of the rodents it developed much faster and the rodents therefore became more succesfull. Sources: Thomas Stainforth Kemp: The origin and evolution of mammals - 2005 - Science www.nationalgeographic.com

Answer 2

They have found members of the Genus Morganucodon between 200,000,000 and 210,000,000 years ago. These are believed to be the oldest mammals found.

Answer 3

Pederpes finneyae is the first known animal to walk the lands of Earth. It is believed to have lived 345 million years ago.

Answer 4

Synapsids are presently first known from about 315 million years ago.

Answer 5

the first mammal on earth was a shrew.

Answer 6

Mammoths