Guaibasaurus

Guaibasaurus is an extinct genus of basal saurischian dinosaur known from the Late Triassic Caturrita Formation of Rio Grande do Sul, southern Brazil. Most analyses recover it as a sauropodomorph, although there are some suggestions that it was a theropod instead. In 2016 Gregory S. Paul estimated it at around 2 meters long and 10 kg, whereas in 2020 Molina-Pérez and Larramendi listed it at 3 meters and 35 kg.

Guaibasaurus

Maurissauro · CC BY-SA 4.0 · via Wikipedia/Commons. 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
GuaibasauridaePBDB
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Diapsida
Length
1.8 mWikidata

Time the record covers

At most 22 million years on record.

Every occurrence read is dated to somewhere between 227.3 Mya and 205.7 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Triassic — about 3 of 3 occurrencesLate Triassic228–227 Mya — about 0.0 occurrences227–226 Mya — about 0.1 occurrences226–226 Mya — about 0.1 occurrences226–225 Mya — about 0.1 occurrences225–224 Mya — about 0.1 occurrences224–223 Mya — about 0.1 occurrences223–223 Mya — about 0.1 occurrences223–222 Mya — about 0.1 occurrences222–221 Mya — about 0.1 occurrences221–220 Mya — about 0.1 occurrences220–220 Mya — about 0.1 occurrences220–219 Mya — about 0.1 occurrences219–218 Mya — about 0.1 occurrences218–217 Mya — about 0.1 occurrences217–217 Mya — about 0.1 occurrences217–216 Mya — about 0.1 occurrences216–215 Mya — about 0.1 occurrences215–214 Mya — about 0.1 occurrences214–213 Mya — about 0.1 occurrences213–213 Mya — about 0.1 occurrences213–212 Mya — about 0.1 occurrences212–211 Mya — about 0.1 occurrences211–210 Mya — about 0.1 occurrences210–210 Mya — about 0.1 occurrences210–209 Mya — about 0.1 occurrences209–208 Mya — about 0.1 occurrences208–207 Mya — about 0.1 occurrences207–207 Mya — about 0.1 occurrences207–206 Mya — about 0.1 occurrences206–205 Mya — about 0.0 occurrences227.8 Mya205.2 Mya

3 occurrences of Guaibasaurus on record, most of them in the Late Triassic. 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

3 occurrences

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

1 formation

Caturrita — 29.56°S, 53.45°WCaturrita — 29.68°S, 52.84°W

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The named rock units Guaibasaurus has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Guaibasaurus and its relatives

Late Triassic

Where Guaibasaurus and its relatives were recorded in the Late Triassic.

Found in the same rock

23 taxa

The Paleobiology Database records 2 sites for Guaibasaurus, and this reads all of them. The number is how many of those sites it was catalogued from too.

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

3 references

Each of the 3 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. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Picture of Guaibasaurus

Credit
Maurissauro
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

No 3D scan of Guaibasaurus was found in MorphoSource and Sketchfab.

Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.

The description on this site

Licence
CC BY-SA 4.0

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itGuaibasauridae through timeFormations of the Late TriassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Bonaparte et al. 1999