See text Arius is a genus of catfishes (order Siluriformes) of the family Ariidae.

The genus Arius is distributed in brackish and fresh waters of Eastern Africa and south to Southeast Asia.

The genus was never properly defined, and many species previously classified in Arius are now in other genera.

[1] A. jatius lacks these tooth plates, but has been included in this genus based on its adipose fin and lateral line.

[2] In addition, a fairly extensive fossil record exists, encompassing several species, but mainly represented by otoliths.