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| Six Reasons Why Eutriconodonts Are Awesome | |
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| Topic Started: Apr 22 2017, 11:00 AM (625 Views) | |
| heliosphoros | Apr 22 2017, 11:00 AM Post #1 |
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https://ichthyoconodon.wordpress.com/2017/04/22/six-reasons-why-eutriconodonts-are-awesome/ https://circlesfan.tumblr.com/post/163846174082/six-reasons-why-eutriconodonts-are-awesome Edited by heliosphoros, Aug 7 2017, 06:51 AM.
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| magpiealamode | Apr 22 2017, 12:52 PM Post #2 |
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No good hero is a one-trick phony.
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Thanks for the fascinating read. A good reminder that animals are much more than just a stop on the evolutionary journey. Question: You speak highly of the scrapping ability of Repenomamus; what are you suggesting are the biggest things it could take on/scare away and is that size exceeded in the formation from which it was excavated? |
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| heliosphoros | Apr 22 2017, 12:59 PM Post #3 |
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Depends on a few factors, but I feel most local theropods aside from Yutyrannus wouldn't be safe.
Edited by heliosphoros, Apr 22 2017, 01:00 PM.
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| AnimalGenius | Apr 22 2017, 04:36 PM Post #4 |
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Just a ZT Youtuber
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Thanks for teaching me something about animals I have never heard of! I would love to see this added to ZT you know? They look like adorable prehistoric shrews and flying squirrels! =D |
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| Incinerox | Apr 23 2017, 02:46 AM Post #5 |
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Āeksiot Zaldrīzoti
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Thats because the local theropod fauna, save for Yutyrannus (and an as yet unnamed carnosaur probably), were all 2m long (give or take) and in Repenomamus's weight class. Which in itself is a weird concept in the Mesozoic. I feel like theres a missing "medium tier" to the Yixian food web. Anywho, I'm not normally a mammal guy, but I do genuiunely enjoy the former existence of eutriconodonts. They're a badass lot. Edited by Incinerox, Apr 23 2017, 02:47 AM.
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| magpiealamode | Apr 23 2017, 09:14 AM Post #6 |
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No good hero is a one-trick phony.
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So then, you think we're lacking fossil evidence? Have you considered the possibility that the presence of Repenomamus might be limiting factor in theropod size? I've not studied the Yixian formation, but that does seem unusual to me, mammals or no. |
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| heliosphoros | Apr 23 2017, 10:17 AM Post #7 |
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Maybe the Yixian was unusual in having an eutriconodont in a large meso-predator role.
Edited by heliosphoros, Apr 23 2017, 10:18 AM.
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| Incinerox | Apr 24 2017, 07:32 AM Post #8 |
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Āeksiot Zaldrīzoti
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But that's the thing, it's not large at all. I'm not even comparing it with other carnivores at this point either. There's a huge number of both predator and prey species from numerous clades which are all within Repenomamus's size range (basically anywhere under 20kg or a couple of metres in length). Then the next step up is immediately in the multi-ton catagory - a 9m theropod, a 7m hadrosaur, and a 14m sauropod. Bolong is the only "mid-sized" animal in the whole ecosystem, estimated at "about 200kg" according to wikipedia and the shocking absence of pics doesn't help here. Shouldn't there be... Ya know... More? I'm kinda digressing at this point. I don't want to step on the badassitude of Repenomamus, because, let's face it, I want to keep my legs. But at the same time, if you compare it with, say, wolverines, they didn't exactly remove wolves, lynx or mountain lions from their ecological equation. I guess you can see where my skepticism of that point is coming from. |
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| stargatedalek | Apr 24 2017, 09:57 AM Post #9 |
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I'm not slow! That's just my moe!
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I'm extremely skeptical that a relatively small terrestrial animal, mammal or otherwise, could have presented a limiting factor in theropod growth in a swamp where most of the small dinosaurs were flighted if not true birds. Also, I think Zhenyuanlong and Changyuraptor are being vastly underestimated here. If Velociraptor could hunt Protoceratops, Zhenyuanlong could at least present a fair fight for Repenomamus. |
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| magpiealamode | Apr 24 2017, 01:33 PM Post #10 |
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No good hero is a one-trick phony.
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Perhaps we should consider this: we have an unusually large mammal in what looks to be a meso-predator role. What evolutionary cause would have driven Repenomamus to attain its size and anatomy, and more importantly, what allowed it? And if we compare them to wolverines, let's not glaze over the fact that wolverines are known to drive much larger predators away from their kills, and are capable of taking down prey much larger than they are. |
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| stargatedalek | Apr 24 2017, 02:54 PM Post #11 |
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I'm not slow! That's just my moe!
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It just doesn't make sense unless it's eating smaller mammals, it shows no adaptations for climbing or for swimming, which is where nearly all of the non-mammalian animals would be. Yixian has a lot of birds and turtles, but not much for small fully terrestrial prey. |
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| Incinerox | Apr 24 2017, 03:42 PM Post #12 |
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Āeksiot Zaldrīzoti
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I don't dispute this. With its size and build, I can easily see Repenomamus squaring up against a rival or prey item several times larger than itself. But like I said before, if we go by the wolverine analogue, it does not, by any means, mean a total ecological removal of larger predators. But what I do think we're looking at is a major predator of frogs, lizards, smaller mammals (of which there is a LOT), and small or baby dinosaurs. Invertebrates likely weren't ruled out either. |
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| Furka | Apr 24 2017, 04:03 PM Post #13 |
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With such a build I wouldn't rule out Kleptoparasitism either, while not as the sole or main method of feeding. Also I had no idea Gobiconodon and such had platypus-like spurs. Tho I keep asking myself what would their actual purpose be, their location just feels too odd for any practical use to me ... |
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| heliosphoros | Apr 24 2017, 04:12 PM Post #14 |
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Platypi use them quite well for interspecific combat, but unfortunately it's unclear if sexual dimorphism influenced the presence of spurs in other non-therian mammals. I imagine they probably evolved to stab in case they got caught. |
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