Organism · Placental mammals
Amphicyon ingens
Source time context (not species duration) · ≈ 23–5.33 Ma
Inferred life reconstruction
Amphicyon ingens
Overview
Amphicyon ingens is a bear dog known for a long, narrow muzzle and powerful limbs. Research has compared its skull with several limb bones. It raises different questions from the head to the structures supporting the feet.[1]
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Key facts
The study discusses short distal hindlimb segments and plantigrade hind feet. It is an example of interpreting how a body was supported from bone form.[1]
Time and place
It is known from research on Miocene material. The Miocene spanned approximately 23–5.3 million years ago. Skull and limb material explicitly assigned to the species form the basis of comparison.[1][3]
The time range describes source context, not the complete duration of this species.
Size, form and skeleton
A long, narrow muzzle and strong limbs are described. The research material includes a skull and humerus, ulna, femur, and tibia. The lower back and distal hindlimb regions were also used to compare body function.[1]
The 2021 CarniFOSS dataset lists a median body mass of approximately 579 kg, calculated from measurements of several bones.[4]
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Habitat and reproduction
What functional clues are provided by powerful limbs and short distal hindlimbs? The study discussed plantigrade support and lower-back flexibility. Questions can expand from one limb region to its connection with the trunk.[1]
Fossil discovery
A 2006 ecomorphological study of bear dogs examined species-specific bones together with a museum-mounted skeleton. The display was described as a composite skeleton assembled from several specimens. A 2016 museum account also introduced the Amphicyon ingens exhibit.[1][2]
References
- Sorkin (2006) — Ecomorphology of giant bear-dogs
- American Museum of Natural History (2016) — Evolution of fossil beardogs
- International Commission on Stratigraphy (2024) — Geological time chart
- Faurby·Morlo·Werdelin(2021) — CarniFOSS fossil carnivorous mammal body-mass data
- Revision — Classification of Late Miocene Suidae from Eurasia
- Carolinea tooth study — Microstonyx antiquus
Research questions
Do head and limb bones answer the same questions? Tooth wear and the muzzle provide clues to structures handling food, while limbs and the lower back suggest how the body was supported. Research investigates ecology by comparing several regions together.[1]
Observation
Move your gaze from the long, narrow muzzle to the powerful limbs. Picturing the short distal hindlimbs and plantigrade support lets us examine the broad body outline alongside small connections.[1]
Related organisms
Hippopotamodon antiquusPlacental mammalsSource time context (not species duration) · ≈ 9.7–0 MaDifferent bodies among mammals
Explore the bodies and life settings of Amphicyon and Hippopotamodon together. Amphicyon: Amphicyon ingens is a bear dog known for a long, narrow muzzle and powerful limbs. Research has compared its skull with several limb bones. Hippopotamodon: Hippopotamodon antiquus is a large suine studied through dental material. The name Microstonyx antiquus also appears in the literature.