Alvarezsauria
infraorder · Bonaparte 1991 · accepted · extinct
64 descendant taxa · 53 fossil sites · 20 formations · 7 countries
Lived when
Jurassic – Paleogene
165.3–66 million years ago
Found where
7 countries
20 rock formations
Fossil record
53 sites
37 catalogued specimens
Inside this group
Immediate children
- Terminal taxon — no children recorded.
Did you know
Facts from the record
- Its fossils span about 99 million years, from 165.3 to 66 million years ago.
- The youngest known fossil is around 66 million years old — that is roughly 220 times further back than the whole of human history.
- Alvarezsauria was named in 1991 (Bonaparte 1991) — 35 years ago.
- Fossils have been recorded in 7 countries and 20 named rock formations.
- 37 individual specimens are catalogued in museum collections.
- This group contains 64 named taxa, including 28 species.
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Where next
Data from the Paleobiology Database (CC BY 4.0).