Subspecies
Traditionally, three subspecies of this howler are listed, though Stanyon et al. (1995) concluded the number of chromosomal differences between A. s. sara and A. s. arctoidea (which resulted in A. s. sara being a considered a full species) was on a similar scale to that found between A. s. sara and A. s. seniculus by Minezawa et al. (1986).
- Colombian red howler, Alouatta seniculus seniculus
- Ursine howler, A. s. arctoidea
- Juruá red howler, A. s. juara
Read more about this topic: Venezuelan Red Howler