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本帖最後由 tigerb 於 2018-7-16 01:39 編輯
恐劍齒虎和人類比較圖
短劍劍齒虎（Machairodus），又名短劍虎，是生存於1500-200萬年前歐洲、亞洲、非洲及北美洲的大型劍齒虎亞科。短劍劍齒虎的物種在體型及比例上有很大的差異，最大約有獅子的大小。牠們有很大的犬齒，齒上有鋸齒，但卻在幾年內就會磨損。
短劍劍齒虎有可能是似劍齒虎的祖先。短劍劍齒虎與所有貓科都是從原小熊貓演化而來。
恐劍齒虎與其主要獵物平齒三趾馬的體型對比
Machairodus was similar in size to a modern lion, standing about 1 meter at the shoulder. The species once referred to Machairodus coloradensis was apparently significantly larger, about 1.2 m at the shoulder, according to skeletal and life reconstructions.[4] If accurate, this would have made M. coloradensis one of the largest felids. However M. coloradensis, along with M. kurteni and M. giganteus, has been reassigned to the genus Amphimachairodus and by extent, the Homotherini based on both morphology and its time of appearance in North America.[5] Nimravides catacopsis also has been separated from Machairodus, as the two are too different in regards to autapomorphies to be synonymous.However, the species Machairodus horribilis, which stands as the largest known species of the genus, is comparable in size to the equally large and much later Smilodon, weighing in at around 404.6 kg (892 lb.). Its skull, measuring upwards of 16 inches in length, is the largest known skull for any machairodont.
The skull of Machairodus was noticeably narrow compared with the skulls of modern pantherine big cats, and the orbits were relatively small. The canines were long, thin and flattened from side to side but broad from front to back like the blade of a knife, as in Homotherium. The front and back edges of the canines were serrated when they first grew, but these serrations were worn down in the first few years of the animal's life.
Machairodus was about 2 metres long and probably hunted as an ambush predator.
短劍劍齒虎和人類比較圖
Name: Machairodus (Knife tooth).
Phonetic: Mah-care-o-dus.
Named By: Johann Jakob Kaup - 1833.
Classification: Chordata, Mammalia, Carnivora, Felidae, Machairodontinae, Machairodontini.
Species: M. africanus, M. aphanistus, M. giganteus, M. oradensis, M. colorandensis, M. transvaalensis, M. alberdiae, M. copei, M. laskarevi, M. irtyschensism, M. kabir, M, kurteni, M. fires, M. ischimicus, M. schlosseri, M. palanderi, M. palmidens, M. inexpectatus, M. giganteus.
Diet: Carnivore.
Size: Up to 2 meters long, and 1.2 meters high at the shoulder. Full size depends upon species.
Known locations: Across Europe, Asia, Africa and North America.
Time period: Tortonian of the Miocene through to late Ionian of the Pleistocene.
Fossil representation: Many known specimens.
Amphimachairodus giganteus
Amphimachairodus (†Amphimachairodus giganteus Kretzoi, 1929)
Order: Carnivora
Family: Felidae
Subfamily: †Machairodontinae
Tribe: †Machairodontini
Genus: †Machairodus
Type species: Amphimachairodus giganteus
Temporal range: It inhabited Eurasia and Northern Africa during the late Miocene epoch
Size: 2.3 meters long, 1.3 meters tall at the shoulder. Weight estimated at up to 200 kg
Amphimachairodus is an extinct genus of large machairodonts belonging to the clade known as Eumachairodontia (true saberteeth) along with relatives like Smilodon and Homotherium.[2] It is also a member of the tribe Homotherini within Machairodontidae and is most closely related to such species as Xenosmilus, Homotherium itself, and Nimravides. It inhabited Eurasia, Northern Africa and North America during the late Miocene epoch.
There was marked sexual dimorphism in A. giganteus, with males being much larger than females.
A single fossil specimen examined by Legendre and Roth was determined to have an approximate body mass of 201.8 kg. Amphiachairodus kabir was a large species from Central Africa whose size may have weighed 350–490 kg. The species Amphimachairodus coloradensis (formerly Machairodus coloradensis) was a significantly large animal, about 1.2 m (3.9 ft) at the shoulder, according to skeletal and life reconstructions, potentially making it one of the largest known felids.
Amphimachairodus was about 2 metres long
Size chart featuring some of the largest felines of all time.
From the largest to the smallest:
Panthera leo atrox, Smilodon populator, Panthera tigris acutidens, Panthera leo spelaea and Panthera tigris altaica (modern siberian tiger).
Is worth mentioning that the three first animals are very similar in size, and the definition and perception of "largest" between them varies from person to person.
[GoogleDrive]1cC7uhevfLKndQjh0MYQnYXUve2p9L5tJ[/GoogleDrive]
Blue Whales 101 _ Nat Geo Wild
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