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Which ostariophysan order contains the most families?
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ostariophysan
Knifefish, or featherback (Xenomystus nigri)
Within the superorder Ostariophysi, the order Siluriformes (catfishes) contains the most families, with 35 recognized families.1
The remaining families within the superorder are distributed among the other four orders: Characiformes, Cypriniformes, Gymnotiformes, and Gonorynchiformes.1