Nyctereutes
Nyctereutes is a genus of Asian canid with two extant species, the raccoon dogs: the common raccoon dog and the Japanese raccoon dog. Nyctereutes entered the fossil record 5.5 million years ago (Mya) in northern China. It was one of the earliest canines in the Old World. All but two species became extinct before the end of the Pleistocene. A study suggests that the evolution of Nyctereutes was influenced by environmental and climatic changes, such as the expansion and contraction of forests and the fluctuations of temperature and precipitation.
Nyctereutes (Ancient Greek: νύξ, νυκτ- [nýx, nykt-] 'night' + ἐρέυτης [eréutēs] 'wanderer') is a genus of Asian canid with two extant species, the raccoon dogs: the common raccoon dog (Nyctereutes procyonoides) and the Japanese raccoon dog (Nyctereutes viverrinus).[1] Nyctereutes entered the fossil record 5.5 million years ago (Mya) in northern China. It was one of the earliest canines in the Old World. All but two species became extinct before the end of the Pleistocene. A study suggests that the evolution of Nyctereutes was influenced by environmental and climatic changes, such as the expansion and contraction of forests and the fluctuations of temperature and precipitation.[3]
Characteristics
They are typically recognized by their short snouts, round crania and the shaping of their molars, specifically the ratio between M1 and M2. Nyctereutes is considered mainly an opportunistic carnivore, feeding on small mammals, fish, birds, and insects, alongside occasional plants, specifically roots. Their diet is mostly influenced by environmental factors.[3] Japanese raccoon dogs are considered distinct from the mainland species because of the larger skull size found in Russian and Hokkaido raccoon dogs.[4]
Species
Extant species
| Common name | Scientific name and subspecies | Range | Size and ecology | IUCN status and estimated population |
|---|---|---|---|---|
| Common raccoon dog
|
Nyctereutes procyonoides (Gray, 1834) Four subspecies
|
Mongolia, Russian Far East, China, Korea, Vietnam; introduced to Europe |
Size: Habitat: Diet: |
LC
|
| Japanese raccoon dog
|
Nyctereutes viverrinus (Temminck, 1838) |
Japan | Size: Habitat: Diet: |
LC
|
Fossil species
- †Nyctereutes abdeslami 3.6—1.8 Mya (Morocco)[5]
- †Nyctereutes donnezani 9.0—3.4 Mya (Eastern Europe, Spain)
- †Nyctereutes lockwoodi 3.42—3.2 Mya (Ethiopia)[6]
- †Nyctereutes megamastoides (Europe)[3]
- †Nyctereutes sinensis 3.6 Mya—781,000 years ago (Eastern Asia)[7]
- †Nyctereutes tingi[3]
- †Nyctereutes vinetorum[citation needed]
References
Further reading
- Wayne, Robert K. (June 1993). "Molecular evolution of the dog family". Trends in Genetics. 9 (6): 218–224. doi:10.1016/0168-9525(93)90122-x. PMID 8337763.