''Masracetus'' (from Arabic ''Masr'', "Egypt", and Greek ''ketos'', "whale") is an extinct genus of

basilosaurid Basilosauridae is a family of extinct cetaceans. They lived during the middle to the early late Eocene and are known from all continents, including Antarctica. They were probably the first fully aquatic cetaceans.Buono M, Fordyce R.E., Marx F.G. ...

ancient whale known from the

Late Eocene The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "daw ...

(

Priabonian The Priabonian is, in the ICS's geologic timescale, the latest age or the upper stage of the Eocene Epoch or Series. It spans the time between . The Priabonian is preceded by the Bartonian and is followed by the Rupelian, the lowest stage of t ...

, ) of Egypt. ''Masracetus'' was briefly described in an addendum by and is known from just an assemblage of vertebrae and a poorly reconstructed skull from 1908. The

lumbar vertebrae The lumbar vertebrae are, in human anatomy, the five vertebrae between the rib cage and the pelvis. They are the largest segments of the vertebral column and are characterized by the absence of the foramen transversarium within the transverse p ...

are large but relatively short (anteroposteriorly) compared to those of other archaeocetes; the diameter is almost the same as for ''

Basilosaurus ''Basilosaurus'' (meaning "king lizard") is a genus of large, predatory, prehistoric archaeocete whale from the late Eocene, approximately 41.3 to 33.9 million years ago (mya). First described in 1834, it was the first archaeocete and prehistori ...

isis'' but the length is less than half of the latter. ''Masracetus'' is larger than ''

Cynthiacetus ''Cynthiacetus'' is an extinct genus of basilosaurid early whale that lived during the Late Eocene (Bartonian-Priabonian, .) Specimens have been found in the southeastern United States and Peru ( Otuma Formation). Description ''Cynthiacetus ...

'', but it is suggested that the former might be synonymized as a junior synonym with the latter. The species name honours Richard Markgraf, palaeontologist

Ernst Stromer Ernst Freiherr Stromer von Reichenbach (12 June 1871 in Nürnberg – 18 December 1952 in Erlangen) was a German paleontologist. He is best remembered for his expedition to Egypt, during which the first known remains of ''Spinosaurus'' we ...

's fossil collector, who collected the type specimen in 1905. ''Masracetus''' type locality is the

Birket Qarun Formation Birket is a small town in Lolland Municipality, Denmark. It had a population of 214 residents in 2014. It is located 8 km east of Horslunde, 17 km northeast of Nakskov, 10 km northwest of Stokkemarke and 21 km northwest of Maribo. Birket Church ...

in Dimê (, paleocoordinates ) north of lake

Birket Qarun Lake Moeris ( grc, Μοῖρις, genitive Μοίριδος) is an ancient lake in the northwest of the Faiyum Oasis, southwest of Cairo, Egypt. In prehistory, it was a freshwater lake, with an area estimated to vary between and . It persists ...

, but specimens have also been found in the

Qattara Depression The Qattara Depression ( ar, منخفض القطارة, Munḫafaḍ al-Qaṭṭārah) is a depression in northwestern Egypt, specifically in the Matruh Governorate. The depression is part of the Western Desert of Egypt. The Qattara Depressi ...

and

Fayum Faiyum ( ar, الفيوم ' , borrowed from cop, ̀Ⲫⲓⲟⲙ or Ⲫⲓⲱⲙ ' from egy, pꜣ ym "the Sea, Lake") is a city in Middle Egypt. Located southwest of Cairo, in the Faiyum Oasis, it is the capital of the modern Faiyum ...

.. Retrieved July 2013.

Notes

References

* Basilosauridae Prehistoric cetacean genera Fossil taxa described in 2007 Eocene mammals of Africa {{paleo-whale-stub