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A really old and small sperm whale by Bran-Artworks A really old and small sperm whale by Bran-Artworks
Diagrama de Ferecetotherium kellogi, el cachalote más antiguo que se conoce, procedente del Oligoceno tardío de Azerbaiyán (23 mda), probablemente se alimentó de peces en vez de calamares. Silueta especulativa inferida en base a parientes fósiles 
Referencias: 
-G. A. Mchedlidze. 1976. Osnovnye Cherty Paleobiologischeskoi Istorii Kitoobraznykh [M. Uhen/M. Uhen/M. Uhen]
-O. Lambert. 2008. Sperm whales from the Miocene of the North Sea: a re-appraisal. Bulletin del'Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 78:277-316 [M. Uhen/M. Uhen/M. Uhen]

Diagram of Ferecetotherium kellogi, the oldest known sperm whale, its remains were found in Azerbaijan dating back to the late Oligocene (23mya), probably fed on fish rather squid like modern Sperm Whale. Speculative silhouette inferred based on other fossil relatives.
References: 
- G. A. Mchedlidze. 1976. Osnovnye Cherty Paleobiologischeskoi Istorii Kitoobraznykh [M. Uhen/M. Uhen/M. Uhen]
-O. Lambert. 2008. Sperm whales from the Miocene of the North Sea: a re-appraisal. Bulletin del'Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 78:277-316 [M. Uhen/M. Uhen/M. Uhen].
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:iconvasix:
vasix Featured By Owner Jul 11, 2015  Hobbyist Digital Artist
The more I look at your artwork, the more I wonder if the Zygophyseter-grade forehead is an ancestral condition for physeteroids in general...
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:iconbran-artworks:
Bran-Artworks Featured By Owner Jul 12, 2015  Professional General Artist
Well fossil suggest that, as far l know physeteroids with and extended forehead are: Physeter itself, Livyatan, and the poorly known Idiophyseter. most of fossil physeteroids lack a concave rostrum although some are not entirely convinced of the Zygophyseter-like forehead.
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:iconyutyrannus:
Yutyrannus Featured By Owner Sep 24, 2015  Hobbyist Traditional Artist
Would Brygmophyseter have had the Zygophyseter-like forehead as well?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Sep 25, 2015  Professional General Artist
Probably, is a sister taxon to Zygophyseter.
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:iconyutyrannus:
Yutyrannus Featured By Owner Sep 25, 2015  Hobbyist Traditional Artist
Okay, thanks! I'm drawing one now so I was wondering about that :).
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:iconvasix:
vasix Featured By Owner Jul 12, 2015  Hobbyist Digital Artist
"Idiophyseter"...sounds like...an unfortunate name lol, but seriously physeteroids are getting weirder by the minute now...at least kogiids don't show changes like that, or do they?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Jul 12, 2015  Professional General Artist
No, they kept the basic shape although this Scaphokogia had a long snout, like if were trying to mimic Physeter...
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:iconvasix:
vasix Featured By Owner Jul 13, 2015  Hobbyist Digital Artist
What a queer bunch!
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:iconzimices:
Zimices Featured By Owner Jul 8, 2015  Hobbyist
Los dientes posteriores son muy curiosos... ¿que funcionalidad tenían?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Jul 8, 2015  Professional General Artist
En realidad los dientes irían de manera mas vertical en el cráneo, se movieron en la preservación (acá si dibuje el fósil pero creo que puedo colocarle los dientes restantes)
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July 6, 2015
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