''Conchodus'' is an extinct

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 marine

lungfish Lungfish are freshwater vertebrates belonging to the class Dipnoi. Lungfish are best known for retaining ancestral characteristics within the Osteichthyes, including the ability to breathe air, and ancestral structures within Sarcopterygii, inc ...

which lived during the

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

period. The following species are known: * †''C. elkneri'' Gorisdro-Kulczycka, 1950 - Late Devonian (

Frasnian The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage. Major reef-building was under way during ...

) of

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...

* †''C. excessus'' Krupina, 1990 ''-'' Late Devonian (

Famennian The Famennian is the later of two faunal stages in the Late Devonian epoch. The most recent estimate for its duration is that it lasted from around 371.1 to 359.3 million years ago. An earlier 2012 estimate, still used by the International Commis ...

) of

Oryol Oryol ( rus, Орёл, , ɐˈrʲɵl, a=ru-Орёл.ogg, links=y, ), also transliterated as Orel or Oriol, is a Classification of inhabited localities in Russia, city and the administrative center of Oryol Oblast, Russia, situated on the Oka Rive ...

, Russia * †''C. jerofejewi'' ( Pander, 1858) - Late Devonian of

Leningrad Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...

, Russia (=''Cheirodus lateralis'' von Eichwald, 1846) * †''C. ostreaformis'' McCoy, 1848 (

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

) - Devonian of Scotland * †''C. parvulus'' Bryant ''ex'' Bryant & Johnson, 1936 - Famennian of

Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...

, USA * †''C. pinguiculus'' Krupina, 1990 - Devonian of Russia * †''C. variabilis'' Eastman, 1908 - Late Devonian of

Iowa Iowa ( ) is a U.S. state, state in the upper Midwestern United States, Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Ill ...

and

Missouri Missouri (''see #Etymology and pronunciation, pronunciation'') is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it border ...

, USA An indeterminate species is known from

Latvia Latvia, officially the Republic of Latvia, is a country in the Baltic region of Northern Europe. It is one of the three Baltic states, along with Estonia to the north and Lithuania to the south. It borders Russia to the east and Belarus to t ...

. The species ''C. plicatus'' Dawson, 1868 of

Nova Scotia Nova Scotia is a Provinces and territories of Canada, province of Canada, located on its east coast. It is one of the three Maritime Canada, Maritime provinces and Population of Canada by province and territory, most populous province in Atlan ...

is now placed in '' Sagenodus'' as ''S. plicatus''.

References

Prehistoric lungfish genera Devonian sarcopterygians of Europe Devonian sarcopterygians of North America Frasnian genera Famennian genus extinctions Fossils of Poland Fossils of Russia Fossils of Scotland Fossils of the United States Taxa named by Frederick McCoy Fossil taxa described in 1848 {{paleo-lobefinned-fish-stub