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Good evening folks. I have two fish, both listed as Knightia and both from Farson Wyoming. They look similar but they don't look like the same species to me, am I wrong? These are 10 and 11 year old purchases with the first being dug in the 60's from "near Farson" and the second stating it is from the Green River Formation, Farson.
Astephus and Hypsidoris are both members of the Family Ictaluridae, native to North America. Green River catfish are easily recognized by their stout dorsal and pectoral spines, scale less bodies and broad skull. Ictalurid species have four pairs of barbels (or whiskers). Like modern catfish, they possessed a vibration sensitive organ called the Weberian apparatus. The Weberian apparatus consists out of specialized vertebrae at the front of the spinal column which passed vibrations to the inner ear using the swim bladder as a resonance chamber. The structure essentially acts as an amplifier o