Haplocheirus was the largest known definite alvarezsauroid, at around 2 meters long. It had an enlarged thumb claw like other alvarezsauroids, but also retained two other functional fingers, unlike more derived alvarezsauroids, where only the thumb was significantly large and clawed. It had long legs and was probably a fast runner.
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| - Haplocheirus was the largest known definite alvarezsauroid, at around 2 meters long. It had an enlarged thumb claw like other alvarezsauroids, but also retained two other functional fingers, unlike more derived alvarezsauroids, where only the thumb was significantly large and clawed. It had long legs and was probably a fast runner.
- Location: Shishugou Formation, Xinjiang, China Age: Late Jurassic; Oxfordian, 160 million years ago Haplocheirus is the oldest known alvarezsaurid, a group of strange bird-like dinosaurs (or dinosaur-like birds) that have been found solely in the Cretaceous of the Americas and Asia. Its presence in the Jurassic confirms the idea that the maniraptorans diverged earlier than Archaeopteryx. It is known from a nearly complete skeleton, though its skull shows characteristics of a late juvenile animal. It had small teeth with serrations, suggesting this animal was carnivorous. Later alvarezsaurids had more pointed teeth without serrations.
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| - Location: Shishugou Formation, Xinjiang, China Age: Late Jurassic; Oxfordian, 160 million years ago Haplocheirus is the oldest known alvarezsaurid, a group of strange bird-like dinosaurs (or dinosaur-like birds) that have been found solely in the Cretaceous of the Americas and Asia. Its presence in the Jurassic confirms the idea that the maniraptorans diverged earlier than Archaeopteryx. It is known from a nearly complete skeleton, though its skull shows characteristics of a late juvenile animal. It had small teeth with serrations, suggesting this animal was carnivorous. Later alvarezsaurids had more pointed teeth without serrations. Resources: "Dinodata - Haplocheirus sollers"
- Haplocheirus was the largest known definite alvarezsauroid, at around 2 meters long. It had an enlarged thumb claw like other alvarezsauroids, but also retained two other functional fingers, unlike more derived alvarezsauroids, where only the thumb was significantly large and clawed. It had long legs and was probably a fast runner.
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