腕龙

📖 1. 概览

前肢比后肢更长，头部高度达13m（相当于4～5层公寓楼高），是侏罗纪极具代表性的巨型蜥脚类恐龙。

🌐 Wikipedia 摘要摘录

Brachiosaurus is a genus of sauropod dinosaur that lived in North America during the Late Jurassic, about 155.6 to 145.5 million years ago. It was first described by American paleontologist Elmer S. Riggs in 1903 from fossils found in the Colorado River valley in western Colorado, United States. Riggs named the dinosaur Brachiosaurus altithorax; the generic name is Greek for "arm lizard", in reference to its proportionately long arms, and the specific name means "deep chest". Brachiosaurus is estimated to have been between 18 and 22 meters long; body mass estimates of the subadult holotype specimen range from 28.3 to 46.9 metric tons. It had a disproportionately long neck, small skull, and large overall size, all of which are typical for sauropods. Atypically, Brachiosaurus had longer forelimbs than hindlimbs, which resulted in a steeply inclined trunk and a proportionally shorter tail.

🦴 2. 身体结构与特征

颈椎与背椎内部发育有与气囊（Air sac）相连的气腔，既减轻了骨骼重量，又将呼吸效率发挥到极致。

🔍 3. 化石记录与古生态

它每天摄食数百kg针叶树叶，漫步于侏罗纪平原之上。

🇰🇷 4. 与韩国的关联

它与朝鲜半岛固城、海南、义城发现的巨型蜥脚类足迹化石的造迹恐龙同属一个谱系。