Key Identification Features
- The caudal fin has an emarginate structure, and its upper lobe may have a distinct isolated white margin.
- brunneus usually has 17 to 20 fin rays, which is fewer than the related flat bullhead (A.
- It usually has six dorsal soft rays, and does not have palatine teeth.
- catus typically has a larger head relative to its body width, and a shorter anal fin relative to its body length, with 22 to 24 anal rays.
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