Desmostylus hesperus A species of subungulate mammals from the mid-Tertiary (Upper Miocene to Lower Pliocene) of western N. America and eastern Asia that lived in shallow coastal waters. It was an early sirenian-like animal, although the body was large (of hippopotamus size) with massive limbs. The skull was elongate, and there were ‘tusks’ on both upper and lower jaws.
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Mammutidae , Mammutidae (Mastodontidae; order Proboscidea, suborder Mammutoidea) An extinct, monospecific family (Mammut or Mastodon) of mastodons, comprising ele… Upper , up·per1 / ˈəpər/ • adj. 1. situated above another part: his upper arm the upper atmosphere. ∎ higher in position or status: the upper end of the soci… Visean , Visean 1. An epoch in the Mississippian, comprising the Chadian, Arundian, Holkerian, Asbian, and Brigantian Ages (these are also stage names in west… Snakeheads (Fishes) , Channidae (snakeheads; subclass Actinopterygii, order Perciformes) A family of tropical, freshwater fish that have an elongated body, snake-like head… Carboniferous Period , Carboniferous period (kärbənĬf´ərəs), fifth period of the Paleozoic era of geologic time (see Geologic Timescale, table), from 350 to 290 million yea… Aquitanian , Aquitanian 1. The earliest age in the Miocene Epoch, preceded by the Chattian (Oligocene), followed by the Burdigalian, and with a lower boundary set…
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