Name: Dipterus ‭(‬Two wings‭)‬.
Phonetic: Dip-teh-rus.
Named By: Adam Sedgwick‭ & ‬Roderick Murchiso‭ ‬-‭ ‬1828.
Synonyms: Catopterus.
Classification: Chordata,‭ ‬Sarcopterygii,‭ ‬Dipnoi,‭ ‬Dipteriformes,‭ ‬Dipteridae.
Species: D.‭ ‬valenciennesi‭ (‬type‭?)‬,‭ ‬D.‭ ‬contraversus,‭ ‬D.‭ ‬crassus,‭ ‬D.‭ ‬macropterus,‭ ‬D.‭ ‬serratus.
Diet: Carnivore/Piscivore.
Size: About‭ ‬35‭ ‬centimetres long.
Known locations: Belgium‭ ‬-‭ ‬Evieux Formation,‭ ‬and the USA,‭ ‬Pennsylvania‭ ‬-‭ ‬Lockatong Formation.
Time period: Famennian of the Devonian through to the Norian of the Triassic.
Fossil representation: Many individuals.

       Dipterus is a genus of early lungfish that for a long time was thought only to have lived in Europe during the Devonian period.‭ ‬However,‭ ‬since another genus of fish named Catopterus became treated as a synonym to the genus,‭ ‬it now seems that the Dipterus existed all the way to the late Triassic period in North America.‭ ‬The genus is also sometimes credited as living in Australia too.
       As a lungfish,‭ ‬Dipterus would have been able to survive out of the water for extended periods,‭ ‬suggesting a lifetime spent in shallow waters that were replenished by seasonal floodwaters,‭ ‬or perhaps even tidal waters where the water level rose and fell with the push and pull of the tide.‭ ‬Dipterus however does not seem to have lungs that were as well adapted as later genera,‭ ‬and still gills,‭ ‬that were better adapted than said later genera.‭ ‬With these features in mind,‭ ‬it seems that Dipterus were more at home in the water.
       Like with many of their sarcopterygian ancestors,‭ ‬the fins on the body of Dipterus were situated mostly towards the rear,‭ ‬and the tail was asymmetrical with a highly developed upper lobe.‭ ‬These would have been features that allowed for both sudden bursts of speed as well as reducing any rubbing of the tail against the bottom,‭ ‬something that would‭ ‬have protected the tail when Dipterus was resting in shallows or out of the water completely.

More information on the above fish can be found on their corresponding pages; Ceratodus, Chinlea, Dipnorhynchus, Dipterus, Eusthenopteron, Gooloogongia, Griphognathus, Gyroptychius, Holoptychius, Hyneria, Macropoma, Mandageria, Osteolepis, Panderichthys, Rhizodus, Strunius, Tiktaalik (upper estimate).

Further reading
- On some changes in the names, generic and specific, of certain fossil fishes. - The American Naturalist 33:783-792. - O. P. Hay - 1899.
- Upper Devonian fish from Colorado. - Journal of Paleontology 10(7):656-659. - W. L. Bryant & J. H. Johnson - 1936.


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