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Phalangeriformes

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Phalangeriformes is a large group of small to medium-sized marsupials. These animals are native to Australia, New Guinea, and Sulawesi. You might recognize them by names like possums, gliders, or cuscus.

Ringtail Possum. Brisbane
Ringtail Possum. Brisbane

They belong to a biological suborder. This group is considered paraphyletic. This means they do not include all the descendants of their common ancestor. Specifically, the Macropodiformes, which include kangaroos, are considered a subset of the Phalangeriformes. This classification is based on research by Ruedas and Morales in 2005. They are important members of the larger order Diprotodontia.

Most members of this group share several physical traits. They are quadrupedal, which means they walk on four legs. They are also diprotodont. This refers to a specific type of tooth structure. Most species have long tails to help them move. Many are nocturnal, so they are active during the night. They are also arboreal, meaning they live in trees.

Sugar Gliders eating Mealworms
Sugar Gliders eating Mealworms

This lifestyle helps them find food and avoid danger. They live in many different vegetated habitats. Some species have even adapted to live in urban settings near humans.

Dietary habits vary significantly across the different species. Some are generalist herbivores or omnivores. The common brushtail possum is a good example of this. Other animals are much more specialized in what they eat. The greater glider is a specialist browser of eucalyptus trees. The honey possum is a nectar-feeder.

Feathertail glider, Acrobates pygmaeus (Tony Rees photograph)
Feathertail glider, Acrobates pygmaeus (Tony Rees photograph)

There are even insectivores, such as the mountain pygmy possum. These different diets allow many species to live in the same areas without competing for the same food.

There is a massive range in size within Phalangeriformes. The smallest member is the Tasmanian pygmy possum. It is the smallest diprotodont marsupial in existence.

Eastern Pygmy Possum Pilliga Forest NSW
Eastern Pygmy Possum Pilliga Forest NSW

On the other end of the scale are the bear cuscuses. Two species of bear cuscus can exceed very large sizes.

Ailurops ursinus Naemundung 2 North Sulawesi
Ailurops ursinus Naemundung 2 North Sulawesi

These size differences show how much the group has changed to fit different environments. From tiny gliders to large cuscuses, they fill many different roles in nature.

Scientists organize these animals into several families. One family is Burramyidae, which includes the various pygmy possums. Another is Phalangeridae, which contains the brushtail possums and cuscuses.

Southern Brown Cuscus, photo by CNZdenek & AJBurnett
Southern Brown Cuscus, photo by CNZdenek & AJBurnett

The superfamily Petauroidea includes families like Pseudocheiridae and Petauridae. These families contain many famous animals like sugar gliders and ringtail possums.

Sugar Gliders eating Mealworms
Sugar Gliders eating Mealworms

Each family has its own unique way of living and moving through the trees.

The name "possum" is a bit of a linguistic coincidence. It comes from the Powhatan word "aposoum," which means "white animal."

Phalanger maculatus (male) - Museo Civico di Storia Naturale Giacomo Doria - Genoa, Italy - DSC03051
Phalanger maculatus (male) - Museo Civico di Storia Naturale Giacomo Doria - Genoa, Italy - DSC03051

This word originally described white dogs in the Americas. While American opossums are also marsupials, they are not closely related to these animals. Australasian possums are actually more closely related to kangaroos. This shows why using scientific names is so important for accuracy.

Phalangeriformes are connected to the wider ecosystem of Oceania. They are part of the Diprotodontia, which also includes koalas and wombats.

Striped Possum JCB
Striped Possum JCB

By studying these animals, scientists learn about how life evolved in Australia and nearby islands. Their presence in both wild forests and cities shows how flexible life can be. They remain a vital part of the natural history of the southern hemisphere.

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🖼️ Images & Media (9)
File:Eastern Pygmy Possum Pilliga Forest NSW.jpg
Eastern Pygmy Possum Pilliga Forest NSW.jpg
File:Ailurops ursinus Naemundung 2 North Sulawesi.jpg
Ailurops ursinus Naemundung 2 North Sulawesi.jpg
File:Southern Brown Cuscus, photo by CNZdenek & AJBurnett.jpg
Southern Brown Cuscus, photo by CNZdenek...
File:Phalanger maculatus (male) - Museo Civico di Storia Naturale Giacomo Doria - Genoa, Italy - DSC03051.JPG
Phalanger maculatus (male) - Museo Civico...
File:Ringtail Possum. Brisbane.jpg
Ringtail Possum. Brisbane.jpg
File:PhalangistaHerbertensisSmit.jpg
PhalangistaHerbertensisSmit.jpg
File:Striped Possum JCB.jpg
Striped Possum JCB.jpg
File:Sugar Gliders eating Mealworms.jpg
Sugar Gliders eating Mealworms.jpg
File:Feathertail glider, Acrobates pygmaeus (Tony Rees photograph).jpg
Feathertail glider, Acrobates pygmaeus...
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