In South America, megafauna include primarily the large terrestrial mammals (proboscideans, extinct xenarthrans, and extinct orders such as Notoungulata)[47].
Stillness is becoming as extinct as the polar bear.
Extinct orders have been added to this and are indicated by an obelisk.
Most extinct orders of insects developed during the Permian period that began around 270 million years ago.
Now, my profession is becoming as extinct as its subject matter.
Best to catalog these tales before they're as extinct as the Quaalude.
As described in Biology Letters, the researchers studied two small fossils of trigonotarbids, an extinct order related to spiders, found in 300 million-year-old deposits at Coseley in England.
The extinct order Pycnodontiformes is often associated with the holosteans.
This group probably evolved in the Jurassic, having split from the now extinct order Necrotaulidae.
Four members of the extinct order †Creodonta were included: three †hyaenodontids (†Thinocyon, †Sinopa, †Hyaenodon) and one †oxyaenid (†Patriofelis).
