4634 Pseudoscaphirhynchus kaufmanni (Kessler, 1877) Acipenseridae Sturgeons Acipenseriformes Chondrostei Amu Darya sturgeon Asia: Former USSR: Amu Darya River from the Pyandzh to the mouths and lower tributaries. Sometimes in the brackish water of Taldyk Bay, the delta of the Amu Darya in the Aral Sea. Considered close to extinction (Ref. 6866). Registered in the 1984 USSR Red Book; 1985 Turkmen SSR Red Data Book; 1996 IUCN Red List (Ref. 35930). AMNH 97557 1991 Pseudoscaphirhynchus kaufmanni AMNH 97558 1991 Pseudoscaphirhynchus kaufmanni