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Paddlefish. Paddlefish (family Polyodontidae) are a family of ray-finned fish belonging to order Acipenseriformes, and one of two living groups of the order alongside sturgeons (Acipenseridae). [3][4] They are distinguished from other fish by their elongated rostra, which are thought to enhance electroreception to detect prey.
The American paddlefish (Polyodon spathula), also known as a Mississippi paddlefish, spoon-billed cat, or spoonbill, is a species of ray-finned fish. It is the last living species of paddlefish (Polyodontidae). This family is most closely related to the sturgeons; together they make up the order Acipenseriformes, which are one of the most ...
Chinese paddlefish. The Chinese paddlefish (Psephurus gladius; simplified Chinese: 白鲟; traditional Chinese: 白鱘; pinyin: báixún: literal translation: "white sturgeon "), also known as the Chinese swordfish, is an extinct species of fish that was formerly native to the Yangtze and Yellow River basins in China. With records of specimens ...
The largest fish of the now-extinct class Placodermi was the giant predatory Dunkleosteus. The largest and most well known species was D. terrelli, which grew almost 9 m (29.5 ft) in length [21] and 4 t (4.4 short tons) [22] in weight. Its filter feeding relative, Titanichthys, may have rivaled it in size. [23]
Acipenseriformes / æsɪˈpɛnsərɪfɔːrmiːz / is an order of basal [1] ray-finned fishes that includes living and fossil sturgeons and paddlefishes (Acipenseroidei), as well as the extinct families Chondrosteidae and Peipiaosteidae. [2][3][4] They are the second earliest diverging group of living ray-finned fish after the bichirs.
Shovelnose sturgeon. The shovelnose sturgeon (Scaphirhynchus platorynchus) [5] is the smallest species of freshwater sturgeon native to North America. It is often called hackleback, sand sturgeon, or switchtail. Switchtail refers to the long filament found on the upper lobe of the caudal fin (often broken off as adults).
Protopsephurus. 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 ...
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