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Acrophyseter sp-now robustus by Bran-Artworks Acrophyseter sp-now robustus by Bran-Artworks
 This new specimen consist in a partial skull, still has to be formally described, being somewhat  larger and older than A.deinodon. Acrophyseter robustus is thought to be a powerful biter as exostoses in its jaws indicates great forces when biting like modern False Killer whale
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:iconvasix:
vasix Featured By Owner Nov 29, 2017  Hobbyist Digital Artist
I was going over the animals in the Pisco Formations and was surprised that this part has both the most diverse fossil fauna-fossilworks.org/bridge.pl?a=co… and doesn't have any killer sperm whales. It's like a weird gap. Any idea why?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Nov 30, 2017  Professional General Artist
Has been years since that publication and certainly unpublished material, primarily teeth of stem-physeteroids have been found as lower as the earliest Pliocene, a form of Acrophyseter may had coexist with all these genera at AGL. Acrophyseter seems to be a really succesful genus back then.
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:iconvasix:
vasix Featured By Owner Nov 30, 2017  Hobbyist Digital Artist
Oh I re-read this-www.researchgate.net/publicati… and yeah it's my mistake, Livyatan is not from CLB. I am still confused though about SSW
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:iconvasix:
vasix Featured By Owner Edited Nov 30, 2017  Hobbyist Digital Artist
Ah so, Acrophyseter appears in the Pliocene...so it's Livyatan and its fauna, a small gap at the end of the Miocene and finally Acrophyseter appears? The SSW part is dated at a little over 6-5 mya anyway, that's end Miocene. I saw the new paper about the re-dating of the Pisco physeteroids and the re-dating of Livyatan to about 9 mya in Pisco, Cerro del Brugos I think it was called? I don't remember. Anyway the dating and fauna for Sud-Sacao West, is it still good?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Dec 3, 2017  Professional General Artist
Yes, from Cerro La Bruja, in terms of time, A.robustus may have coexisted with Livyatan, then we have this Acrophyseter sp and later A.deinodon, there is also undescribed material, teeth of what may be a even larger species from the earliest Pliocene. Yes the dating is still good.
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:iconvasix:
vasix Featured By Owner Dec 3, 2017  Hobbyist Digital Artist
Oh, so there really aren't any at Sud-Sacao West? I'm rather confused now, since SSW is latest Miocene...how odd then, actually. Four species of Acrophyseter throughout the Pisco Formation is incredible. 
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:iconpaleo-reptiles:
Paleo-reptiles Featured By Owner May 6, 2015
nice
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:iconbran-artworks:
Bran-Artworks Featured By Owner May 9, 2015  Professional General Artist
Thanks Amin
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Feb 5, 2015  Hobbyist Traditional Artist
One thing I always wonder about prehistoric whales is the shape of their head, especially with animals that look like this: how do we know it had such a head?
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:iconbran-artworks:
Bran-Artworks Featured By Owner Feb 5, 2015  Professional General Artist
Well thats somewhat hard to tell since soft tissue havent preserved, however the shape of the skull gives a hint of how the cetaceans would have look like, in this case the shape of the skull indicates that acrophyseter spermaceti organ didnt extended forward to the tip of the snout as physeter. How we know this? the snout isnt concave as in Physeter so lt probably had a profile similar to a delphinoid or beaked whale.
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Feb 6, 2015  Hobbyist Traditional Artist
Ah okay, so that's how it works. Thanks for the info :)
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