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Wang and R. Tedford derived. Such a dental pattern proved to be very versatile and can readily be adapted toward either a hyper- or hypocarnivorous type of dentition, both of which were repeatedly employed by both borophagines and canines Fig. The history of the borophagines also begins with a small fox-like form, Archaeocyon, in the late Oligocene.

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Contemporaneous with larger and more predatory hesperocyonines, these early borophagines in the late Oligocene and early Miocene tended to be more omnivorous hypocarnivorous in their dental adaptations, such as Oxetocyon, Otarocyon and Phlaocyon. One extreme case, Cynarctoides evolved selenodont-like molars as in modern artiodactyles, a rare occurrence of herbivory among carnivorans.

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These early borophagines are generally no larger than a raccoon, which is probably a good ecological model for some borophagines at a time when procyonids had yet to diversify. After some transitional forms in the early Miocene, such buix suisse anti aging Cormocyon and Desmocyon, borophagines achieved their maximum ecological and numerical i.

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By then, borophagines had acquired their unique characteristics buix suisse anti aging a broad muzzle, a bony contact between premaxillary and frontal, multicuspid incisors, and an enlarged parastyle on the upper carnassials modied from an enlargement of the anterior cingulum. By the end of the Miocene, borophagines had evolved another lineage of omnivores, although only modestly in that direction, in the form of Carpocyon. Species of Carpocyon are mostly the size of jackals to small wolves.

At the same time, the emergence of the genus Epicyon from a Carpocyon-like ancestor marked another major clade of hypercarnivorous borophagines.

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The terminal species of Epicyon, E. Closely related to Epicyon is Borophagus, the terminal genus of the Borophaginae. Both Epicyon and Borophagus are best known for their massive P4 and p4 in contrast to the diminutive premolars in front.

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This pair of enlarged premolars is designed for cracking bones, mirroring similar adaptations by hyaenids in the Old World. Advanced species of Borophagus survived most of the Pliocene but became extinct near the beginning of the Pleistocene.

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Caninae As in the hesperocyonines and borophagines, a small fox-sized species of Leptocyon is the earliest recognized member of the subfamily Caninae. Besides sharing a bicuspid talonid of m1 and a quadrate M1 with the borophagines, Leptocyon is also characterized by a slender rostrum and elongated lower jaw, and correspondingly narrow and slim premolars, features that are inherited in all subsequent canines.

It rst appeared in the early Oligocene and persisted into the late Miocene. Throughout its long existence no other canid genus had as long a durationfacing intense competition from the larger and diverse hesperocyonines and Evolutionary History of Canids 11 borophagines, Leptocyon generally remains small and inconspicuous, never having more than two or three species at a time. By the latest Miocene, fox-sized niches are widely available in North America, left open by extinctions of all small borophagines.

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The true fox clade, tribe Vulpini, emerges at this time and undergoes a modest diversication to initiate primitive species of both Vulpes and Urocyon and their extinct relatives.

The North American Pliocene record of Vulpes is quite poor. Fragmentary materials from early Blancan indicate the presence of a swift fox-like form in the Great Plains. Vulpes species were widespread and diverse in Buix suisse anti aging during the Pliocene see Qiu and Tedford,resulting from an immigration event independent from that of the Canis clade.

Red fox Vulpes vulpes and Arctic fox Vulpes lagopus appeared in North America only in the late Pleistocene, evidently as a result of immigration back to the New World.

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Preferring more wooded areas, the grey fox Urocyon has remained in southern North America and Middle America. Records of the grey fox clade indicate a more or less continuous presence in North America throughout its existence, with intermediate forms leading to the living species U. Morphologically, the living African bat-eared fox Otocyon is closest to the Urocyon clade, although molecular evidence suggests that the bat-eared fox may lie at the base of the fox clade or even lower Geffen et al.

If the morphological evidence has been correctly interpreted, then the bat-eared fox must represent a Pliocene immigration event to the Old World independent of other foxes. A transitional form, Protocyon, occurs in southern Asia and Africa in the early Pleistocene.

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Advanced members of the Caninae, tribe Canini, rst occur in the middle Miocene Ma in the form of a transitional taxon Eucyon. As a jackal-sized canid, Eucyon is mostly distinguished from the Vulpini in an expanded paroccipital process and enlarged mastoid process, and in the consistent presence of a frontal sinus. The latter character initiates a series of transformations in the Tribe Canini culminating in the elaborate development of the sinuses and a domed skull in Canis lupus.

The North American records all pre-date the European ones, suggesting a westward dispersal of this form. Arising from about the same phylogenetic level as Eucyon is the South American sirt1 anti aging subtribe Cerdocyonina.