''Anosteira'' is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of carettochelyid

turtle Turtles are reptiles of the order (biology), order Testudines, characterized by a special turtle shell, shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Crypt ...

from the

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

to the

Oligocene The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that defin ...

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

and

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

Taxonomy

After * ''Anosteira manchuriana'' Zangerl, 1947 Liaoning, China, late

* ''Anosteira maomingensis'' Chow and Liu, 1955 Youkanwo Formation, Guangdong, China, Late Eocene * ''Anosteira mongoliensis'' Gilmore, 1931 Inner Mongolia, China, Late Eocene-

* ''Anosteira ornata'' Leidy, 1871 Bridger Formation, Wyoming, USA, Early Eocene * ''Anosteira pulchra'' (Clark, 1932) Uinta Formation, Utah, USA, Middle Eocene (

Lutetian The Lutetian is, in the geologic timescale, a stage (stratigraphy), stage or age (geology), age in the Eocene. It spans the time between . The Lutetian is preceded by the Ypresian and is followed by the Bartonian. Together with the Bartonian it ...

)

References

Sources

* ''The Osteology of the Reptiles'' by Alfred Sherwood Romer * ''Chinese Fossil Vertebrates'' by Spencer G. Lucas * ''The Age of Dinosaurs in Russia and Mongolia'' by Michael J. Benton, Mikhail A. Shishkin, David M. Unwin, and Evgenii N. Kurochkin. p. 344.

External links

''Anosteira''
in the Paleobiology Database Carettochelyidae Eocene turtles Oligocene turtles Cenozoic reptiles of Asia Cenozoic reptiles of North America Prehistoric turtle genera Taxa named by Joseph Leidy {{paleo-turtle-stub