Amphicyon
Extinct bear-dog carnivorans from the Miocene epoch.
Wikipedia / Wikimedia Commons
Amphicyon is an extinct genus of large carnivorans from the family Amphicyonidae, often called "bear-dogs" because they had features of both bears and dogs. They lived during the Miocene epoch and were found across North America, Eurasia, and Africa.
The genus was first proposed in 1836 by French palaeontologist Édouard Lartet, based on fossils he discovered in the French department of Gers, especially the commune of Sansan. Among the fossils he found were remains of "Mastodonte," "Dinotherium," "Rhinoceros," and "Palaeotherium" (a valid genus of early perissodactyl), as well as deer fossils ranging in size from modern French deer to small antelope. Lartet noted that these "peaceful ruminants" lived alongside a "formidable" large carnivore, which he tentatively named *Amphicyon* based on two half-jaws and some bones sent to a museum. He described its incisors as unilobed and its canines as compressed like a raccoon's, while its carnivorous molar and first two tubercles resembled those of dogs. The most distinctive trait, he said, was a third tubercle on the lower carnassial, unknown in any other carnivore. The name may come from Greek *amphí* ("both") and *kúon* ("dog"), but Lartet never explained the etymology.
Though the name was initially provisional, French anatomist Henri Marie Ducrotay de Blainville—who often discussed Lartet’s finds with him—sketched mammal skeletons and fossils in 1841, recognizing two species: "Amphicyon major" and "Amphicyon? minor." In 1851, Lartet reviewed the carnivoran genera from Sansan. He confirmed *Amphicyon* as a carnivorous mammal the size of modern bears, discovered in 1835. He repeated that its single-lobed incisors and serrated canines were raccoon-like, while its molars were dog-like. He assigned the fossils—including the third lower-jaw tubercle, which he noted also appears in the bat-eared fox (then called "Canis megalotis")—to the species *Amphicyon major*. He described its plantigrade locomotion as similar to bears, with minor differences. Blainville speculated it had a long, strong tail. The species "Amphicyon minor" was reclassified as a separate genus, *Hemicyon*, described as a carnivore larger than a European wolf, more dog-like than *Amphicyon*, with mustelid-like teeth. Lartet also described a new genus, *Pseudocyon*, which he mistakenly thought was di
- field
- Paleontology
- known_for
- Large Miocene carnivorans with bear-like and dog-like features
- type_species
- Amphicyon major
- first_described
- 1836 (provisionally named by Édouard Lartet)
- temporal_range
- Miocene epoch
Lore & Background
In a note dated May 16, 1836, French geologist Alexandre Leymerie communicated a letter from French palaeontologist Édouard Lartet, which provided details of his exploits in palaeontological sites in the French department of Gers, in particular the commune Sansan. Lartet described his finds of fossil taxons, including a 'formidable' large carnivore he provisionally named Amphicyon based on two half-jaws and bones. He described it as having unilobed incisors and compressed canines similar to raccoons but also a carnivorous molar and its first two tubercles conforming those to dogs. Lartet stated that the genus's most distinct trait was the existence of a third tubercle on the lower carnassial, not known in any other carnivore. The genus name may come from Ancient Greek ἀμφ
Reader's Guide
Amphicyon represents a significant group of Miocene carnivorans that combined features of bears and dogs, reflecting a diverse adaptive radiation. The genus was first recognized from fossils in Sansan, France, and later identified across Europe, Asia, and North America. Its taxonomy has been complex, with multiple species described and sometimes reassigned to other genera such as Hemicyon, Pseudocyon, or Hubacyon. The type species, Amphicyon major, is the best known, with cranial and postcranial remains found across Western and Central Europe and Turkey. Later species like A. eppelsheimensis, A. gutmanni, and A. pannonicus are considered closely related, with some possibly representing the youngest members of the family. The genus's distinctive third tubercle in the upper jaw and its plantigrade locomotion similar to extant bears highlight its unique evolutionary position. Disputes remain over species validity and relationships, reflecting ongoing paleontological research.
Did You Know?
- The genus name Amphicyon may come from Ancient Greek ἀμφί (amphí), meaning 'both', and κύων (kúon), meaning 'dog', but Lartet did not define the genus's etymology.
- Lartet described Amphicyon as having unilobed incisors and compressed canines similar to raccoons, but a carnivorous molar similar to dogs.
- The species Amphicyon major was originally named by French anatomist Henri Marie Ducrotay de Blainville in 1841.
- Some later species of Amphicyon, such as A. gutmanni and A. pannonicus, may be among the youngest known amphicyonids, dating to MN11-12.
Frequently Asked Questions
What is Amphicyon?
Amphicyon is an extinct genus of large carnivorous mammals belonging to the family Amphicyonidae. They are popularly nicknamed "bear-dogs" because their anatomy blends traits of both bears and canids.
Why do people call Amphicyon a "bear-dog"?
The nickname reflects the animal's mixed morphology, combining a robust, bear-like body plan with more dog-like skull and dental features. This unusual blend of two very different modern carnivore groups is what made the term stick.
When and where did Amphicyon live?
These carnivorans were active during the Miocene epoch and had an exceptionally wide distribution. Fossil remains have been recovered from sites across North America, Eurasia, and Africa.
Who first described Amphicyon and when?
French palaeontologist Édouard Lartet provisionally named the animal in 1836 after uncovering fossils while exploring sites in the Gers department, particularly the commune of Sansan. Geologist Alexandre Leymerie then formally proposed the genus name based on Lartet's letter describing the finds.
What is the type species of Amphicyon?
The type species is Amphicyon major. It serves as the taxonomic reference point to which all other species assigned to the genus are compared.
More in Extinct Cenozoic Mammals 1-24
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