Paddlefish
Videos
Paddlefish are members of the ray-finned fish family Polyodontidae, which belong to the basal order Acipenseriformes, one of two living groups within this order alongside sturgeons. Their most distinc
Paddlefish Polyodon spathula
A specimen of Psephurus gladius, Museum of Hydrobiological Sciences, Wuhan Institute of Hydrobiology
Closeup of the head of an American paddlefish, showing the presence of electrorecepting organs (ampullae of Lorenzini)
30-day-old fry of the American paddlefish
Sturgeon
Videos
Sturgeon are the 27 species of fish belonging to the family Acipenseridae. The earliest sturgeon fossils date to the Late Cretaceous, and are descended from other, earlier acipenseriform fish, which d
Yanosteus longidorsalis, a member of the extinct acipenseriform family Peipiaosteidae from the Early Cretaceous (125–120 Mya) Yixian Formation in Liaoning, China
A fossil sturgeon (right) from the Tanis fossil site, showing the longstanding morphological conservatism of this group
The Atlantic sturgeon (A. oxyrhynchus) is one of the most basal sturgeon species
Shovelnose sturgeons (Scaphirhynchus platorynchus) are morphologically atypical members of the group