What dietary and cranial characteristic distinguishes the hypothetical Oligocene analog, *Protosmustela*, from modern *Mustela nivalis*?

Answer

It had broader molars suggesting a more generalized diet

When comparing the hypothetical early Oligocene musteloid fossil, *Protosmustela*, with the modern least weasel, *Mustela nivalis*, paleontological observations reveal trends toward specialization. *Protosmustela* is inferred to have had broader molars, suggesting its diet was more generalized, possibly incorporating insects or fruit alongside meat. In contrast, *Mustela nivalis* exhibits hyper-carnassial teeth specifically adapted for slicing flesh and a very well-developed sagittal crest, indicative of the powerful biting force required to quickly dispatch small, struggling prey. This comparison illustrates the evolutionary trend within the direct weasel line toward maximizing bite efficiency for hypercarnivory.

What dietary and cranial characteristic distinguishes the hypothetical Oligocene analog, *Protosmustela*, from modern *Mustela nivalis*?

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