Mammal
Alphadon marshi
Alphadon marshiAlphadon marshi was a small, opossum-like metatherian that scurried through the humid undergrowth of Late Cretaceous North America beneath the feet of giant dinosaurs. Tribosphenic molars with pointed shearing cusps allowed it to crush insect exoskeletons, pluck wild fruits, and scavenge vertebrate remains across floodplain forests. Agile limbs and grasping digits suggest it was adept at climbing, likely relying on nocturnal habits and canopy cover to evade contemporary predators.
PrehistoricNocturnal
—observations
—countries
—peak records
ExtinctConservation statusIUCN Red List categoriesLCNTVUENCREWEXExtinctRed List categories, explained →
Diet & preyInsects, Seeds and fruits, Small lizards
Predators
- Dromaeosaurids
- Troodontids
- Crocodyliforms
ThreatsTheropod dinosaurs, crocodyliforms, and the Cretaceous-Paleogene extinction event
HabitatsSubtropical coastal lowlands, floodplains, and mixed canopy forests
Life spanEstimated 2–5 years (based on modern metatherians)
Classification
- FamilyDidelphidae
- SpeciesAlphadon marshi
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Extinct prehistoric species; known only from fossilized teeth and skeletal fragments.
Responsible observation
- Fossil detection: Search screened Late Cretaceous sediments with magnification for distinct, minute tribosphenic teeth.
- Field ethics: Document any vertebrate fossil discoveries in situ and contact authorized geological repositories.
Competitor Thomas E. Williamson, Stephen L. Brusatte, Gregory P. Wilson / CC BY 4.0 · cc-by
Ecosystem Companion no rights reserved, uploaded by wilderbombyx · cc0
Living Relative Cody Pope / CC BY-SA 2.5 · cc-by-sa
Close Relative MCDinosaurhunter / CC BY-SA 3.0 · cc-by-sa
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