The Subspecific Status of Two Central American Sloths

In this concise study, the authors reevaluate the classification of two Central American sloth populations that have long been treated as separate species. By revisiting historic descriptions and examining a broad series of museum specimens from Panama, Costa Rica, Nicaragua, and beyond, they assess the morphological traits once used to distinguish these animals.

The paper reveals that the differences—such as skull shape, nasal structure, and palate grooves—show considerable overlap and variation within the sampled material. Consequently, the researchers propose new subspecific names, positioning the once‑named Bradypus ignavus as a subspecies of Bradypus griseus and confirming Cyclopes mexicanus as a subspecies of Cyclopes dorsalis. Their findings illustrate how careful comparative anatomy can refine our understanding of biodiversity, offering a clear example of taxonomic revision grounded in museum research.