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Both living and fossil paddlefish are found almost exclusively in North America and China. [5] Eight species are known: Six of those species are extinct, and known only from fossils (five from North America, one from China), [2] one of the extant species, the American paddlefish (Polyodon spathula), is native to the Mississippi River basin in ...
The American paddlefish is the sole surviving species in the paddlefish family, the Polyodontidae. This is the sister group to the sturgeons (family Acipenseridae); evidence from DNA sequences suggest that their last common ancestor lived roughly 140 million years ago. [14]
The American paddlefish is the only species of paddlefish living after the extinction of the Chinese paddlefish, which was estimated to be extinct by 2005, and no later than by 2010. [6] Sturgeons are considered by IUCN to be the most critically endangered group of species in the world based on over 85% of sturgeon species being at risk of ...
Most living species of Acipenseriformes are classified as threatened (mostly endangered or critically endangered) by the International Union for Conservation of Nature. The Chinese paddlefish was last seen alive in 2003, and was considered to have gone extinct sometime between 2005 and 2010 by the Yangtze River Fisheries Research Institute in ...
The 100 species with longest life-spans recorded and verified [1] This is a list of the longest-living biological organisms: the individual(s) (or in some instances, clones) of a species with the longest natural maximum life spans. For a given species, such a designation may include:
Both living and fossil paddlefish are found almost exclusively in North America and China. Eight species are known: Six of those species are extinct, and known only from fossils (five from North America, one from China), one of the extant species, the American paddlefish ( Polyodon spathula ), is native to the Mississippi River basin in the U.S.
Protopsephurus is an extinct genus of paddlefish containing the single species Protopsephurus liui, known from the Yixian, Jiufotang and Huajiying formations in Liaoning, northern China from the Barremian to Aptian ages of the Early Cretaceous period around 125-120 million years ago. [1] [2] It is currently the oldest and most basal paddlefish ...
The top size of a female of this species is probably over 452 g (0.996 lb) and 50 cm (20 in) long. [73] In species like the barbeled dragonfish (Idiacanthus atlanticus), the snake-like females can measure up to 0.5 m (1.6 ft) long, about 50 times as long as the male. [141] Although Idiacanthus is much more slender and is lighter than Oppostomias.