T. arenarius

T. arenarius may refer to:
 * Taterillus arenarius, the Robbins's tateril or Sahel gerbil, a rodent species found only in Mauritania
 * Triaeniopholis arenarius, a synonym for Lampropeltis getula, the eastern kingsnake, common kingsnake or chain kingsnake, a harmless colubrid species found in the United States and Mexico