[古生物学•2025] Duonychus tsogtbaatari•Didactyl therizinosaur(Coelurosauria:Therizinosauridae),带有蒙古晚白垩纪

Duonychus tsogtbaatarikobayashi,Zelenitsky,Fiorillo&Chinzorig,2025 www.cell.com/iscience/iscience/fulltext/fulltext/s2589-0042(25)00401-8:00401-8 didactyl therizinosaur, possessing only two manual digits• A keratinous sheath on digit I provides rare insight into theropod claw structure• Duonychus reveals convergent digit III loss in at least five theropod cladesSummaryTherizinosaurs were a group of herbivorous/omnivorous theropod dinosaurs that lived in Asia and North America during the Cretaceous Period.这些兽脚类动物以其三指双手运动,具有大爪状的不安。在这里,我们描述了一种新的且不寻常的物种,therizinosaurid duonychus tsogtbaatari是从蒙古戈壁沙漠的下白垩统Bayanshiree组中恢复的。该物种与其他质龙的不同之处在于,手只有两个手指,而不是三个手指,这是avetheropoda的典型条件,从而进一步洞悉了疗法中的前肢/手动还原。从系统发育中,Duonychus揭示了在Avetheropodans中的教义更广泛但仍有有限的外观。 Duonychus tsogtbaatari的手册不安还保留了几乎完整的三维结构,涵盖了左手手动数字I的不吻合,该结构代表了一个角度的手动爪。这个大爪的强曲率和高度grag fle

来源:Novataxa | 物种新发现