''Xiphiacetus'' is an extinct genus of cetacean known from the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

(early

Burdigalian The Burdigalian is, in the geologic timescale, an age (geology), age or stage (stratigraphy), stage in the early Miocene. It spans the time between 20.43 ± 0.05 annum, Ma and 15.97 ± 0.05 Ma (million years ago). Preceded by the Aquitanian (sta ...

to late

Tortonian The Tortonian is in the geologic time scale an age or stage of the late Miocene that spans the time between 11.608 ± 0.005 Ma and 7.246 ± 0.005 Ma (million years ago). It follows the Serravallian and is followed by the Messinian. The Torton ...

, of Europe and the U.S. East Coast. described ''Priscodelphinus cristatus'' based on partial and poorly preserved skulls with extremely long and narrow

rostra The rostra ( it, Rostri, links=no) was a large platform built in the city of Rome that stood during the republican and imperial periods. Speakers would stand on the rostra and face the north side of the comitium towards the senate house and deli ...

with a huge number of densely packed teeth. He estimated the rostrum of a large specimen to be long and the cranium to be long and slightly wider. He also found a series of well-preserved cervicals and a few of the anterior-most thoracics. described ''Eurhindelphis bossi'' based on an almost complete skull missing ear bones, both mandibles, sixteen vertebrae, ten ribs, an incomplete scapula, a humerus, and a partial sternum. Kellogg named his species after its discoverer, Norman H. Boss, who had discovered the type specimen in 1918. Kellogg also described several other fossils. recombined these two taxa and placed them under the generic name ''Xiphiacetus''.. Retrieved September 2013.

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* * * Miocene cetaceans Prehistoric toothed whales Prehistoric cetacean genera Extinct mammals of Europe Burdigalian first appearances Tortonian extinctions {{paleo-whale-stub