''Dipterus'' (from , 'two' and 'wing') is an extinct genus 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 ...

from the middle

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 of Europe and potentially North America. The genus was established by

Adam Sedgwick Adam Sedgwick FRS (; 22 March 1785 – 27 January 1873) was a British geologist and Anglican priest, one of the founders of modern geology. He proposed the Cambrian and Devonian period of the geological timescale. Based on work which he did ...

Roderick Murchison Sir Roderick Impey Murchison, 1st Baronet (19 February 1792 – 22 October 1871) was a Scottish geologist who served as director-general of the British Geological Survey from 1855 until his death in 1871. He is noted for investigating and desc ...

in the year 1828. It was one of the first lungfish to be described by science. In most respects, ''Dipterus'', which was about long, closely resembled modern lungfish. Like its ancestor '' Dipnorhynchus'', it had

tooth A tooth (: teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, tea ...

-like plates on its

palate The palate () is the roof of the mouth in humans and other mammals. It separates the oral cavity from the nasal cavity. A similar structure is found in crocodilians, but in most other tetrapods, the oral and nasal cavities are not truly sep ...

instead of real teeth. However, unlike its modern relatives, in which the

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage The fus ...

caudal Caudal may refer to: Anatomy * Caudal (anatomical term) (from Latin ''cauda''; tail), used to describe how close something is to the trailing end of an organism * Caudal artery, the portion of the dorsal aorta of a vertebrate that passes into th ...

, and

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

are fused into one, ''Dipteruss fins were still separated. The following species are known: * ''D. macropterus''

Traquair Traquair () is a small village and civil parishes in Scotland, civil parish in the Scottish Borders; Counties of Scotland, until 1975 it was in the county of Peeblesshire. The village is situated on the B709 road south of Innerleithen at . H ...

, 1888 - Lower

Old Red Sandstone Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America. It ...

Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

* ?''D. marginalis'' (Agassiz, 1845) - Devonian of

Leningrad Oblast Leningrad Oblast (, ; ; ) is a federal subjects of Russia, federal subject of Russia (an oblast). The oblast has an area of and a population of 2,000,997 (2021 Russian census, 2021 Census); up from 1,716,868 recorded in the 2010 Russian census ...

, Russia * ?''D. radiatus'' (Eichwald, 1844) - Devonian of Leningrad Oblast, Russia * ?''D. serratus'' (Eichwald, 1844) -

Eifelian The Eifelian is the first of two faunal stages in the Middle Devonian Epoch. It lasted from 393.3 ± 1.2 million years ago to 387.7 ± 0.8 million years ago. It was preceded by the Emsian Stage and followed by the Givetian Stage. North American ...

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 ...

Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...

, and Leningrad, Russia * ''D. valenciennesi'' Sedgwick & Murchison, 1828 (

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 ...

) - Lower Old Red Sandstone of Scotland, including the

Orkney Isles Orkney (), also known as the Orkney Islands, is an archipelago off the north coast of mainland Scotland. The plural name the Orkneys is also sometimes used, but locals now consider it outdated. Part of the Northern Isles along with Shetland, ...

, potentially Oberer Plattenkalk of Germany Many other species from Europe and North America have also been described based on isolated tooth plates, though due to their fragmentary nature, their exact taxonomic affinity is uncertain.

References

Prehistoric lungfish genera Middle Devonian sarcopterygians Devonian sarcopterygians of Europe Devonian sarcopterygians of North America Givetian extinctions Fossils of Scotland Fossils of Germany Fossils of Latvia Fossils of Estonia Fossils of Russia Fossil taxa described in 1828 Taxa named by Roderick Murchison {{paleo-lobefinned-fish-stub