Saghacetus

Saghacetus is an extinct genus of basilosaurid early whale, fossils of which have been found in the Upper Eocene (middle Priabonian, ) Qasr el Sagha Formation, Egypt (29.7°N, 30.8°W, paleocoordinates 25°N, 26.7°W).

Discovery
In 1879, German botanist Georg August Schweinfurth spent many years exploring Africa and eventually discovered the first archaeocete whale in Egypt. He visited Qasr el Sagha in 1884 and 1886 and missed the now famous "Zeuglodon Valley" with a few kilometres. German palaeontologist Wilhelm Barnim Dames described the material, including a well-preserved dentary which is the type specimen of Zeuglodon osiris.

The generic name Saghacetus was established by to group the ancient species Dorudon osiris, D. zitteli, D. sensitivius and D. elliotsmithii on a single species, Saghacetus osiris. This species is distinguished from other members of the subfamily Dorudontinae by its smaller size and the slightly elongated proximal lumbar and caudal vertebrae.

Description
Saghacetus was a small whale, reaching 4 m in length and 350 - 379 kg in body mass. It was smaller than its contemporary Stromerius, both of which are smaller than the older Dorudon.