Evolution What the Fossils Say and Why it Matters

FIGURE 13.16. The family tree of the dogs, showing the variation from weasel-like Hesperocyon to the huge
hyena-like bone-crushing borophagine dogs. (Based on information supplied by Xiaoming Wang; drawing
by Carl Buell)

Eocene Oligocene Miocene Plio Pl

Million

Years

Hesperocyon - Paraehydrocyon

Mesocyon - Enhydrocyon

Ectopocynus

Osbornodon

Otarocyon

Cynarctoides

Phlaocyon

Cormocyon

Desmocyon

Cynarctus

Tomarctus

Aelurodon + Strobodon

Paratomarctus

Carpocyon

Epicyon

Osteoborus

Borophagus

Leptocyon

Foxes

Eucyon

S. Amer.

Canines

Canines

Borophagus

Hesperocyon Canis

Tomarctus

Enhydrocyon

Borophagus

Aelurodon

40 36 32 28 24 20 16 12 8 4 0

Hesperocyon

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