Maniraptora
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Definition
Proper noun (in scientific classification): A major clade (evolutionary group) of coelurosaurian theropod dinosaurs. This group is characterized by advanced features, such as a half-moon-shaped bone in the wrist (semi-lunate carpal) that allowed for greater wrist mobility, and is considered to include dinosaurs closely related to birds. The clade Maniraptora encompasses a diverse range of forms, from the extinct oviraptorosaurs and dromaeosaurs to modern birds (Aves).
Usage Examples
- Scientific context: "The discovery of feathered fossils provided crucial evidence that many members of the Maniraptora were covered in plumage."
- Defining characteristics: "A key anatomical feature uniting the Maniraptora is the presence of a semi-lunate carpal bone."
- Evolutionary relationship: "Birds are now classified as living representatives of the Maniraptora."
Advanced Usage
- Phylogenetic definition: In modern cladistics (the method of classifying organisms based on common ancestry), Maniraptora is often defined as the most inclusive group containing birds () but excluding ornithomimids (e.g., ). This makes it a branch-based clade.
- Debated inclusions: While consensus strongly supports the inclusion of groups like dromaeosaurs (e.g., ) and oviraptorosaurs, the exact placement of some early or basal members within Maniraptora is sometimes a subject of ongoing paleontological research.
Variants and Related Words
- Maniraptoran (noun/adjective): A member of the Maniraptora; pertaining to the Maniraptora.
- Example: "The maniraptoran dinosaur exhibited clear quill knobs on its forearm bones."
- Maniraptoriformes: A slightly broader clade that includes Maniraptora and its close relatives like the ornithomimosaurs.
Synonyms
- There are no direct common-language synonyms for this precise scientific term. In general descriptive language, one might use phrases like:
- Advanced theropods
- Bird-like dinosaurs
- Paravian ancestors (Note: Paraves is a sub-group within Maniraptora)
Related Phrases/Concepts
- Theropoda: The larger dinosaur group to which Maniraptora belongs, primarily bipedal carnivores.
- Coelurosauria: The subgroup of theropods that includes tyrannosaurs, ornithomimosaurs, and maniraptorans.
- Dromaeosauridae: The "raptor" family (e.g., , ) within Maniraptora.
- Oviraptorosauria: A group of often toothless, beaked maniraptorans.
- Aves: The biological class for birds, nested within the Maniraptora clade.
Noun
- advanced theropods including oviraptorids and dromaeosaurs and possibly even modern birds