Eh, here we go again I guess, another Primal suggestion.

Amphimachairodus is an extinct Machairodontinae, that lived during the late Miocene in America, Africa & Eurasia. It was closely related to Xenosmilus, Homotherium, and Nimravides.

It was about as large as a lion or tiger and is currently divided into five species:

• A. giganteus - Kretzoi, 1929
• A. kurteni - Sotnikova, 1992
• A. coloradensis - Anton et al., 2013
• A. alvarezi - Ruiz-Ramoni et al., 2019
• A. hezhengensis - Jiangzuo et al., 2023

A. coloradensis was about 1.2 m (3.9 ft) at the shoulder, A. giganteus had a shoulder height of 1.1 m (3.6 ft), potentially making it one of the largest known felids. However, females were smaller than males, at least for the species A. giganteus. I don't know how much tho, the only thing I can find online is 'There was marked sexual dimorphism in A. giganteus, with males much larger than females.'
If I find any reconstructions or skeletals of females I'll add them as soon as I find them.

Update: I got my hands on a .pdf of The Big Cats and Their Fossil Relatives by Alan Turner & Mauricio Antón. Sadly it's not a skeletal or a side-view reconstruction. It shows 2 Amphimachairodus in the mating process, but it's not worse than the images we have in the February event, so I guess it's ok to post it here. View at your own risk tho.

 


It didn't had as long fangs as other known sabertooth cats, but Amphimachairodus' teeth were not as delicate as their genetic cousins teeth. The females canines were also slimmer and generally longer than the males.


Female Skull



Male Skull


Amphimachairodus also had a longer tail than other known machairodont genera.

I really suggest a video from the Youtuber Sergei Merjeevski, he's talking about the skull and showing a really nice replica.

Below is a reconstructions of A. giganteus

 



This primal variation could be called Amphi, but I'm not good with names.



Update:
If you're googling Amphimachairodus you might also come across the terms Machairodus/Amphimachairodus kabir & Machairodus coloradensis/giganteus etc.

Machairodus/Amphimachairodus kabir was classified as Machairodus, then as Amphimachairodus, but this genus is now invalid and got reclassified ínto it's own species named Adeilosmilus in 2022.

The genus Machairodus is a wastebasket taxon, and over the years many genera of sabertooth cats have been and are still occasionally lumped into it. And thus, Amphimachairodus has also been lumped into it, before it got reclassified to what it is now.