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cover of episode A New Middle Jurassic Allosauroid

A New Middle Jurassic Allosauroid

2025/4/23
logo of podcast I Know Dino: The Big Dinosaur Podcast

I Know Dino: The Big Dinosaur Podcast
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Garrett
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Sabrina
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Sabrina: 元谋猛龙的发现为我们研究侏罗纪中期的兽脚类恐龙提供了新的视角。它并非传统意义上的猛禽或巨型猛禽，而是一种中型兽脚类恐龙，属于中棘龙科。中棘龙科恐龙主要生活在劳亚古陆，体型中等偏大，化石主要发现于中国、泰国和英国。元谋猛龙的化石包括一个相对完整的头骨、下颌骨以及部分颈椎和背椎，头骨长约60厘米。骨骼融合表明其为亚成年或接近成熟个体，头骨和颈椎骨骼具有独特的特征。元谋猛龙的属名源于发现化石的元谋县，种名则指穿过元谋县的金沙江（长江中段）。元谋猛龙化石现陈列于云南省陆丰市陆丰世界恐龙谷博物馆。 基列斯库斯是另一种生活在侏罗纪中期的兽脚类恐龙，属于暴龙超科。它可能具有头冠，但尚不确定，其头骨与原角龙相似。基列斯库斯体型较大，估计体长约5.2米，体重约700公斤。基列斯库斯的化石包括颌骨、部分手骨、足骨以及颈椎、尾椎和腓骨。基列斯库斯的生长速度比大型暴龙类慢，这与其体型较小以及生活在侏罗纪中期有关。基列斯库斯的属名来源于高加索语，意为“蜥蜴”，种名则意为“高贵的起源”，指其为已知最古老的坚尾龙类和暴龙科成员之一。基列斯库斯同时代的动物包括异齿龙、蛇颈龙、剑龙以及鱼类、蝾螈、龟类、蜥蜴、鳄形类、翼龙和哺乳动物。 Garrett: 关于古新世恐龙的讨论，目前没有确凿证据证明存在古新世非鸟类恐龙化石。虽然一些科学家提出过在蒙大拿州地狱溪组发现的约6480万年前的化石可能是古新世恐龙的证据，但这可能存在重新沉积的情况。早期关于古新世恐龙的报道也存在问题，许多化石被误认为是恐龙，实际上是鳄鱼，或者化石的年代和发现地点有误。很难确定地判断化石是否被重新沉积，因为化石的磨损程度不足以确定。因此，目前没有确凿证据证明存在古新世恐龙化石，但理论上古新世存在恐龙化石是可能的。牙齿化石由于其耐磨性和体积小，很难判断其是否被重新沉积。如果发现保存完好的、关节连接的骨骼化石，则可以更有效地排除重新沉积的可能性。虽然目前缺乏证据，但部分恐龙谱系在小行星撞击后存活一段时间是合理的。

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The podcast introduces Yuanmouraptor jinshajiangensis, a new carnivorous dinosaur species discovered in Yunnan Province, China. Despite its name, it's not a raptor but a metriacanthosaurid, a group of theropods that lived in the Middle Jurassic to Early Cretaceous periods. The discovery includes a relatively complete skull and parts of the neck and back.
  • Yuanmouraptor jinshajiangensis is a metriacanthosaurid, not a raptor.
  • Its fossils were found in Yunnan Province, China.
  • The skull is approximately 60 centimeters long.
  • The fossils are on display at the Museum of Lufang World Dinosaur Valley.

Shownotes Transcript

Yuanmouraptor wasn't a raptor or a megaraptorid, but it did have two foot long jaws full of sharp, serrated, teeth. Plus a "noble" tyrannosauroid, Kileskus, that had a long crest down its head and lived about 100 million years before T. rex.

For links to every news story, all of the details we shared about Kileskus, and our fun fact check out https://iknowdino.com/Kileskus-Episode-536/)

Join us at www.patreon.com/iknowdino) for dinosaur requests, bonus content, ad-free episodes, and more.

Dinosaur of the day *Kileskus, *one of the oldest known tyrannosauroids. It lived in the Middle Jurassic of what is now Siberia.

In dinosaur news this week:

  • There’s a new carnivorous metriacanthosaurid dinosaur, Yuanmouraptor jinshajiangensis

 

This episode is brought to you by the Colorado Northwestern Community College. Join them) for two weeks digging up dinosaur bones from the Jurassic Period in Northwest Colorado this summer. For details go to CNCC.edu/dinodig)

See Privacy Policy at https://art19.com/privacy) and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info).