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- noun Plural form of
Sorry, no etymologies found.
"When the alvarezsauroids were initially discovered only about 15 years ago the prevailing hypothesis was that they were birds - a lineage within birds that had lost flight ability," Choiniere told LiveScience.
So its features were in between those of more advanced alvarezsauroids and primitive ones.
The advanced alvarezsauroids had a single claw on the hand that was at least twice as long and four to five times as wide as its other claws.
Many insisted the later alvarezsauroids, which were smaller than Haplocheirus, were actually flightless birds.
Haplocheirus, which lived 160 million years ago, is the oldest known member of an oddball group of bird-like dinosaurs called alvarezsauroids.