The Felidae 2: Asad’s Mate
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Previous Entry Next Entry. View All Archives. Log in No account? Create an account. Remember me. Facebook Twitter Google. However, in other respects Smilodon differed from extant pantherines. Their crania underwent much greater and more localised ontogenetic shape changes than did the mandibles, whereas crania and mandibles of extant pantherines underwent smaller, fewer and less localised shape changes. Ontogenetic shape changes in the two species of Smilodon are largely similar, but differences are also present, notably those which may be tied to the presence of larger upper canines in S.
Several of the specialized cranial characters differentiating adult Smilodon from extant felids in a functional context, which are usually regarded as evolutionary adaptations for achieving high gape angles, are ontogenetic, and in several instances ontogeny appears to recapitulate phylogeny to some extent. No such ontogenetic evolutionary adaptive changes were found in the extant pantherines. Evolution in morphologically derived sabercats involved greater cranial ontogenetic changes than among extant felids, resulting in greatly modified adult craniomandibular morphologies.
In order to document variability and parse the differences between males and female Smilodon, however, scientists Julie Meachen-Samuels and Wendy Binder required a considerable sample of bones from the extinct carnivores.
This can be troublesome with predators as they are usually relatively rare compared to their prey in the fossil record, but predator traps such as the La Brea tarpits in modern-day Los Angeles, California provide scientists with the unique opportunity to study a large number of predators that were all drawn to one place.
These extinct cats are the primary subjects of the new study, and the researchers wanted to compare lower jawbones from both cats to the same bones from modern lions to see if there were significant differences between males and females in each species. Before they started taking measurements of jawbones, though, the authors of the new study had to consider a few potentially confounding factors.
The most important issue was finding a way to determine the approximate age of the animals in their study. Without a way to do this animals of different ages might be determined as belonging to different sexes, something the scientists wanted to avoid.
Previous studies used tooth wear to determine approximate ages of fossil carnivores from La Brea. In a very general sense this might hold true, but studies of carnivores from different sites within the larger La Brea locality have shown that some carnivores exhibited more tooth wear at younger ages than older carnivores from different areas. Hence the amount of tooth wear seen in an individual jaw can be deceptive, but the authors of the new study found a different way to estimate the age of the fossil cats.
As Meachen-Samuels and Binder note in the paper, as big cats age the pulp cavity inside the canine tooth becomes increasingly infilled with dentin.
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The older the animal is, the more filled that pulp cavity is. This is a trend more tightly associated with the aging of the individual animal and not as influenced by external or behavioral factors such as those that cause tooth wear. The fact that the amount of dentin in the lower canine teeth of the fossils selected for study could be observed via x-ray images meant that such identifications could easily be made at low cost and with no damage to the original specimens, as well.
With this technique the authors could then compare the amount of dentine in the teeth to the size of the lower jaw, this latter measurement being used to indicate overall body size in each of the three species being examined. In a species where males differed significantly from females, as in modern lions, it would be expected that the data points would cluster into two groups; one representing males and the other females.
In a species with low sexual dimorphism, however, the measurements should all cluster closely around each other and show no division between two distinct types. As a test that would be useful for later comparison the authors plotted the data from modern lions whose sex was known, and they showed the expected distribution. With one possible exception, there were distinct clusters and males and females divided by an intermediate gap that was not occupied. Results from the Journal of Zoology study. The data presented from top to bottom represent the La Brea lion, modern African lions, and Smilodon fatalis.elk.tradelab.in
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The males are outlined or marked in red and the females in blue. According to these results, the La Brea lions were just as sexually dimorphic, if not moreso, than modern lions while Smilodon exhibited little to no dimorphism. The trends seen in the data from the modern lions allowed the researchers to interpret the data from the extinct La Brea lions and Smilodon.
As might be expected the measurements from the fossil lions fell into two separate groups, just like modern lions, with the larger individuals probably being males and the smaller ones being females. The pattern among the fossil lions was consistent with what is seen in their slightly smaller modern relatives. No such pattern was seen among the data from Smilodon.
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In Smilodon the hypothesized males and females all clustered closely together and did not separate out into two distinct groups. The researchers hypothesized that the largest Smilodon individuals were males and the smallest were females, but even if this is incorrect the overall pattern derived from the examined individuals shows that the Smilodon fatalis from the La Brea tarpits exhibited very little, if any, differences between the sexes.
This is consistent from what has been observed of Smilodon skulls and skeletons, though more examinations will be required to further test the hypothesis the authors of this latest paper have proposed. But what does this say about social systems of the La Brea lions and Smilodon? It is difficult to tell. It could be presumed that the American lion had the same sort of harem system that living lions in Africa and India do, but this is mostly because the extinct variety has a close living relative.
Even species of big cats that are solitary can be sexually dimorphic, so a difference in size between males and females by itself is not a stable indicator of whether a species was social or not. The converse of this is that there are social species such as wolves that exhibit low levels of sexual dimorphism, and the difference may hinge upon reproduction.
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Wolves are monogamous whereas lions are not, and it may be the differences in mating systems that has caused the varying levels of sexual dimorphism in social carnivores. Perhaps Smilodon was a social predator, after all, and if this is correct then it would have had a social system unlike that seen in modern lions.
Smilodon was a unique predator which has no modern equivalent, and I look forward to future studies about it and its numerous saber-toothed relatives. He is also author of the book Written in Stone. Follow Laelaps on Twitter. Would you like to share? Close Comments for this page are closed. Sort by popular now Sort by best rating Sort by newest first Sort by oldest first Showing 6 comments garrett 1 comment collapsed Collapse Expand i believe that prehistoric animals werent ferocious monsters like one might think. Too bad so little is known about its natural history.
However, male-on-female aggression is well known in captive populations and a major management hassle. NOT a social species, and with only minor sexual dimorphism. A clue? I could go on, but suffice to say that I spent a long time picking out the right names for my alien catmen. I think my favorite is a name that ended up on the cutting room floor, though.
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When I first pitched Bound to Please to my editor I wanted my two heroes to have names that had distinctly Irish origins. Only, my first choice for the oldest hero was immediately turned down. As you can probably guess, most of my characters have a specific name for a specific reason. Hence, Rich, Rick and Mick were born! Do you ever search for their meaning? Jade loves to hear from readers! Email: jade. Jade is offering up a digital copy from her backlist. Remember to post your list for your chance to enter. My dog was half shepherd, half lab, and looked very regal, so, I gave him the name.
Needless to say, his name was Shea pronounced Shay — yep, you got it — Shea Gay!!!!