Maniraptora: The Dinosaur Clade That Never Truly Went Extinct
In short: The name Maniraptora means hand snatchers, but these dinosaurs were far more than just predators. While they are famous for their grasping claws and long arms, this diverse group includes everything from flightless herbivores to the ancestors of modern birds. They are the only dinosaur lineage that still thrives today.
Named by Jacques Gauthier in 1986, the Maniraptora clade encompasses a vast array of coelurosaurian dinosaurs. Defined as all dinosaurs more closely related to modern birds than to ornithomimids, the group includes major subgroups like Avialae, Dromaeosauridae, Troodontidae, Oviraptorosauria, and Therizinosauria. Their evolutionary history is marked by distinct skeletal features, most notably long arms, three-fingered hands, and a semi-lunate bone in the wrist that allowed for enhanced grasping capabilities.
The group is defined by complex evolutionary shifts. While many saurischian dinosaurs possess forward-pointing pubic bones, many maniraptorans exhibit a backward-pointing hip, a trait once thought to be primitive. However, evidence suggests that in groups like advanced troodontids and oviraptorosaurs, the forward-pointing hip is actually an evolutionary reversal. Furthermore, while scientists once assumed these dinosaurs were hypercarnivorous, recent research by figures like Lindsay Zanno indicates that the ancestral maniraptoran was likely omnivorous, with herbivory and insectivory appearing across various branches.
Perhaps the most striking aspect of Maniraptora is its relationship to flight and feathers. While modern birds are the only flying members today, evidence of feathers—ranging from simple downy filaments to complex remiges—appears throughout the clade. Some flightless dromaeosaurids, such as Zhenyuanlong suni, possessed wings, leading some researchers to propose that many non-avian groups may have descended from flying ancestors. Even their reproductive biology highlights the transition to modern birds; a 2023 study using clumped isotope thermometry on Troodon eggshells revealed that non-avian maniraptorans retained reptilian-like slow egg calcification and two functional ovaries, a stark contrast to the rapid calcification and single ovary found in modern birds.
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- Summary by Intellect · source: Maniraptora
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