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Amphimachairodus
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Amphimachairodus
 *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author Amphimachairodus Skull (Bone Clone) - length of skull 37 cm - wide of skull 20,5 cm - length of upper fang 10,2 cm  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author Taken from the Book SABERTOOTH Mauricio Anton 
Isn't Machairodus horriblis the same as giganteus?
M. giganteus and M. kabir is apparently smaller than the newly discovered M. giganteus.
Machairodus Horriblis:
A skull of Machairodus horribilis and new evidence for gigantism as a mode of mosaic evolution in machairodonts (Felidae, Carnivora) "Sabertooth cats were extinct carnivorans that have attracted great attention and controversy because of their unique dental morphology representing an entirely extinct mode of feeding specialization. Some of them are lion-sized or tiger-sized carnivorans who are widely interpreted as hunters of larger and more powerful preys than those of their modern nonsaber-toothed relatives. We report the discovery of a large sabertooth cat skull of Machairodus horribilis from the Late Miocene of northwestern China. It shares some characteristics with derived sabertooth cats, but also is similar to extant pantherines in some cranial characters. A functional morphological analysis suggests that it differed from most other machairodont felids and had a limited gape to hunt smaller preys. Its anatomical features provide new evidence for the diversity of killing bites even within in the largest saber-toothed carnivorans and offer an additional mechanism for the mosaic evolution leading to functional and morphological diversity in sabertooth cats." The Biggest Saber Cat So even accounting for its size, M. horriblis had one of the smallest gapes for ancient sized prey (which are, on average, considerably larger than modern prey). The same happened with ancient pantherines, Ngandong Tiger and American Lion, even though both are much larger than their modern relatives, both had narrower jaw gapes and less robust skulls. Maybe there is a noticeable pattern between ancient and modern felines in general.  *This image is copyright of its original author Skull, musculature, and reconstructed head of the saber toothed felid Machairodus giganteus. Although this species is widespread in many European sites of Turolian age, the best cranial remains actually come from China. The Chinese skulls show a greater machairodont specialization than seen in Machairodus aphanistus; the muzzle is more elongated, the mastoid region is projected inferiorly, and the coronoid process in the mandible is reduced, among other adaptations. All these features enabled the cat to open its jaws to around 90ª and efficiently bite the neck of large ungulates. Total length of skull: 37 cm. 
Machairodus horribillis by Roman Uchytel,
https://www.newdinosaurs.com/roman-uchytel/  *This image is copyright of its original author
Late Miocene, painting by Velizar Simeonovski:
 *This image is copyright of its original author
Amphimachairodus by Mauricio Anton
 *This image is copyright of its original author
Machairodus alphanistus
Credit to @_quagga  *This image is copyright of its original author  *This image is copyright of its original author
1) Amphimachairodus giganteus by Roman Uchytel
2) An A. giganteus skull Credit to @evilution_soup  *This image is copyright of its original author  *This image is copyright of its original author
 
I saw a 457 mm skull belonging to A. Giganteus. What is the estimated weight in kg for this skull? @tigerluver @GuateGojira
 (02-20-2022, 06:58 PM)tostwear Wrote: I saw a 457 mm skull belonging to A. Giganteus. What is the estimated weight in kg for this skull? @tigerluver @GuateGojira The biggest skull from this species, measured by scientists and published, it was an specimen labeled as Machairodus horribilis and measured 415 mm in greatest length (Tao et al., 2016). Appart from it, other specimens measure about 36 cm. In the same paper, they use the formula of Van Valkenburg (1990) and got an estimated weight of 405 kg. However remember that this formula overestimage the weight of cats. A felid with such a skull may weight about 300 - 350 kg in the best case and taking in count that Machairodus and Amphimachairodus was robust (based in other bones). Can you show us the skull, document or webpage about that skull of 457 mm for this species? (02-21-2022, 08:54 PM)GuateGojira Wrote:Thanks for your response. Here is the 457mm A. Giganteus Skull (a little below): https://www.angelfire.com/mi/dinosaurs/cats.html(02-20-2022, 06:58 PM)tostwear Wrote: I saw a 457 mm skull belonging to A. Giganteus. What is the estimated weight in kg for this skull? @tigerluver @GuateGojira |
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