''Sphaerexochus'' is a genus of trilobite from the Middle Ordovician to Late

Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...

(468.1 to 418.7 Ma) of Asia,

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

, Europe, and

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

. The type species of the genus is ''Sphaerexochus mirus'' Beyrich 1845 (syn. of ''Sphaerexochus calvus'' Mc Coy 1846) . Similar and related genus is '' Pseudosphaerexochus''.

Species

* ''Sphaerexochus arenosis'' Chatterton and Ludvigsen 1977 * ''Sphaerexochus arenosus'' Chatterton and Ludvigsen 1976 * ''Sphaerexochus atacius'' Ludvigsen 1979 * ''Sphaerexochus brandlyi'' Chatterton and Perry 1984 * ''Sphaerexochus bridgei'' Cooper and Kindle 1936 * ''Sphaerexochus britanicus'' Dean 1971 * ''Sphaerexochus calvus'' Mc Coy 1846 * ''Sphaerexochus dimorphus'' Whittington and Evitt 1953 * ''Sphaerexochus eurys'' Tripp 1962 * ''Sphaerexochus fibrisulcatus'' Lu 1975 * ''Sphaerexochus glaber'' Holloway 1980 * ''Sphaerexochus hapsidotus'' Whittington and Evitt 1953 * ''Sphaerexochus hiratai'' Kobayashi and Hamada 1964 * ''Sphaerexochus hisingeri'' Warburg 1925 * ''Sphaerexochus johnstoni'' Chatterton and Perry 1984 * ''Sphaerexochus laciniatus'' Lindström 1885 * ''Sphaerexochus latifrons'' Angelin 1854 * ''Sphaerexochus molongloensis'' Chatterton and Campbell 1980 * ''Sphaerexochus parvus'' Billings 1865 * ''Sphaerexochus pulcher'' Whittington and Evitt 1953 * ''Sphaerexochus romingeri'' Hall 1868 * ''Sphaerexochus scabridus'' Angelin 1854 * ''Sphaerexochus tuberculatus'' Warburg 1925 * ''Sphaerexochus valcourensis'' Shaw and Bolton 2011

Sources

* ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 59)
''Sphaerexochus''
in the Paleobiology Database Cheiruridae Phacopida genera Ordovician trilobites Silurian trilobites Paleozoic animals of Asia Trilobites of Oceania Trilobites of Europe Trilobites of North America Darriwilian first appearances Silurian extinctions Paleozoic life of the Northwest Territories Paleozoic life of Nunavut Paleozoic life of Quebec {{phacopida-stub