They analysed the genomes of the South American opossum
and the Australian tammar wallaby, as well as the DNA of 20 other marsupials for a "jumping gene" called retroposons.
Many look similar to the North American opossum, with prehensile tails that are adapted to grasp branches.
Voss's work is helping to identify the diversity among South American opossum species.
Characterization of an unidentified Sarcocystis falcatula-like parasite from the South American opossum, Didelphis albiventris from Brazil.
Isolates of Sarcocystis falcatula-like organisms from South American opossums Didelphis marsupialis and Didelphis albiventris from Sao Paulo, Brazil.
There are the references to the American opossum Didelphis in older literature (Hyrtl, 1845), but the specific taxonomic allocation of the materials studied in this pioneering study is questionable.
Even the comparisons with just the few data available for Didelphis permits an appreciation of the morphological diversity of living South American opossums.
Additionally several species of Oochoristica have been described from South American opossums
, including Didelphis marsnpialis.
Genetic evidence shows that a South American ancestor gave rise to all Australian marsupials, and that the South American opossums
were the earliest group to branch off from the other six marsupial clans.
The author of Walker's Mammals of the World, 5th and 6th editions, from which some of this material has been adapted, describes marsupial orders and distribution from American opossums
to Australian wallabies (pictured in b&w photos).