Visual Id Guide: How to Tell an Opossum Apart from a True Possum Instantly
By Alexander Ross
Geography dictates the family tree. The Virginia opossum (Didelphis virginiana) remains the sole surviving North American marsupial, having migrated north during the Great American Biotic Interchange following the formation of the Isthmus of Panama. Its relatives within the order Didelphimorphia inhabit Central and South America, maintaining lineages rooted in ancient Gondwanan split-offs.
Cross the Pacific into Australia, New Guinea, and Sulawesi, and marsupials follow the order Phalangeriformes. These true possums are subarboreal diprotodonts, more closely related to kangaroos, wombats, and koalas than to anything rummaging through an alley in Ohio. While both orders nurse their underdeveloped young inside a maternal marsupial pouch, their internal anatomy and skeletal structures took separate evolutionary tracks.
The separation reveals itself in dental formulas. A Virginia opossum carries 50 sharp teeth, more than any other North American land mammal, adapted for shearing through carrion, insects, and roadkill. Australian possums, such as the common brushtail possum (Trichosurus vulpecula) and the common ringtail possum (Pseudocheirus peregrinus), hold fewer, broader teeth designed primarily for grinding foliage, eucalyptus leaves, flowers, and fruit.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
