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''Undina'' is a
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of
prehistoric Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use o ...
coelacanth The coelacanths ( ) are fish belonging to the order Actinistia that includes two extant species in the genus '' Latimeria'': the West Indian Ocean coelacanth (''Latimeria chalumnae''), primarily found near the Comoro Islands off the east c ...
, lobe-finned fish, which lived from the
Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...
period to the
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...
period.


Species

* ''Undina acutidens'' Reis, 1888 * ''Undina barroviensis'' * ''Undina gulo'' (synonym: ''Holophagus gulo'') (type species) * ''Undina penicillata'' (Munster) * ''Undina? picena'' (Costa, 1862) * ''Undina purbeckensis''


Distribution

Species of this genus have been found in Cretaceous of Spain, in Jurassic of Germany, Turkey and the United Kingdom and in Triassic of Italy.


References


The Paleobiology Database
*Paul H. LAMBER
redescription of the coelacanth Macropoma willemoesii VETTER from the lithographic limestone of Solnhofen (Upper Jurassic, Bavaria)Solnhofen
Prehistoric lobe-finned fish genera Jurassic fish of Europe Latimeriidae Fossil taxa described in 1834 {{paleo-lobefinned-fish-stub