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Whole genome sequencing indicates that Urocyon is the most basal genus of the living canids. [8] Fossils of what is believed to be the ancestor of the gray fox, Urocyon progressus, have been found in Kansas and date to the Upper Pliocene, [9] with some undescribed specimens dating even older. [10]
The gray fox (Urocyon cinereoargenteus), or grey fox, is an omnivorous mammal of the family Canidae, widespread throughout North America and Central America.This species and its only congener, the diminutive island fox (Urocyon littoralis) of the California Channel Islands, are the only living members of the genus Urocyon, which is considered to be genetically sister to all other living canids.
Urocyon: Gray fox; Island fox; Cozumel fox (undescribed) Gray fox (Urocyon cinereoargenteus), in Midtown, Palo Alto, California: Vulpes: Arctic fox; Bengal fox; Blanford's fox; Cape fox; Corsac fox; Fennec fox; Kit fox; Pale fox; Rüppell's fox; Red fox; Swift fox; Tibetan sand fox; The fennec fox is the smallest species of fox
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Urocyon †Urocyon cinereoargenteus †Urocyon progressus †Ustatochoerus; Vallonia †Vallonia gracilicosta †Vallonia pulchella; Valvata †Valvata tricarinata; Vertigo †Vertigo ovata; Vulpes. A living Vulpes velox, or swift fox †Vulpes velox; Zapus †Zapus hudsonius; Zonitoides †Zonitoides arboreus †Zonitoides nitidus
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Cerdocyonina is a natural lineage whose common ancestor was sister to the Eucyon–Canis–Lycaon lineage. It is represented in the fossil record by Cerdocyon 6–5 million years ago, and by Theriodictis and Chrysocyon 5–4 million years ago.
Hesperocyoninae are basal canids that gave rise to the other two canid subfamilies, the Borophaginae and Caninae. [2] This subfamily was endemic to North America, living from the Duchesnean stage of the Late Eocene through to the early Barstovian stage of the Miocene, lasting around 20 million years.