Roudairia
Searched as Roudairia pampaensis. The Paleobiology Database treats Roudairia as the accepted name.

via iDigBio · CC0 · via iDigBio. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Sits inside
- ArcticidaePBDB
- Diet
- suspension feederPBDB, for Venerida
- Life habit
- infaunalPBDB, for Venerida
- Motility
- facultatively mobilePBDB, for Venerida
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At most 6.2 million years on record.
Every occurrence read is dated to somewhere between 72.2 Mya and 66 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.
5 occurrences of Roudairia on record, most of them in the Late Cretaceous. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
5 occurrences- Late Cretaceous100%
These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
2 formations
- Roca Formation · Malargüe Group4
- Jagüel Formation · Malargüe Group1
Loading coastlines…
The named rock units Roudairia has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Roudairia and its relatives
Late CretaceousWhere Roudairia and its relatives were recorded in the Late Cretaceous.
Found in the same rock
88 taxa- Camptonectes tutorae2 sites
- Cardium2 sites
- Echinoida2 sites
- Hemiaster2 sites
- Mesocallista2 sites
- Pseudolimea2 sites
- Turritella webbi2 sites
- Amphidonte mendozana1 site
- Aphrodina (Tikia)1 site
- Austrotrigonia pampeana1 site
- Barroisiceras1 site
- Bivalvia1 site
- Brachidontes1 site
- Brachysphingus gibbosus1 site
- Buchiceras bilobatum1 site
- Campanile1 site
- Cardium riogramamense1 site
- Cinulia pauper1 site
- Coelopleurus castroi1 site
- Coilopoceras1 site
- Corbula lyra1 site
- Cryptochorda1 site
- Cryptorhytis1 site
- Cucullaea (Idonearca) maresi1 site
The Paleobiology Database records 10 sites for Roudairia, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
2 references- Estratigrafía y Paleontología del grupo Malargüe (Límite Cretácico-Paleógeno), en la provincia de Mendoza3
- Molluscs at the K/Pg boundary in Argentina: Extinction and recovery patterns. unpublished Ph.D. thesis2
Each of the 5 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Each entry links to the Paleobiology Database's own record for the work.
Media and terms
Media content1

Picture of Roudairia
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Roudairia was found in Sketchfab.
Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itArcticidae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Munier-Chalmas 1881