Saurischia
Saurischia is one of the two basic divisions of dinosaurs, classified by their hip structure. Saurischia and Ornithischia were originally called orders by Harry Seeley in 1888, though today most paleontologists classify Saurischia as an unranked clade rather than an order.

Auckland War Memorial Museum Tāmaki Paenga Hira · CC BY 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- Also called
- saurischianPBDB
- Sits inside
- DinosauriaPBDB
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Diapsida
Time the record covers
At least 174 million years on record.
The record covers at least 247 Mya to 72.2 Mya. No occurrence read is dated outside 251.902 Mya to 66 Mya.
4,401 occurrences of Saurischia on record, most of them in the Late Cretaceous. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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
4,401 occurrences- Early Triassicunder 1%
- Middle Triassicunder 1%
- Late Triassic9%
- Early Jurassic10%
- Middle Jurassic5%
- Late Jurassic24%
- Early Cretaceous20%
- Late Cretaceous31%
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
653 formations
- Morrison Formation510
- Elliot Formation · Stormberg Group137
- Tendaguru Formation133
- Lameta Formation96
- Vitakri Formation · Fort Munro Group84
- Allen Formation · Malargüe Group81
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The named rock units Saurischia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 629 further formations hold fewer occurrences each and are not listed. 411 occurrences have no formation on record, which is common for older literature.
Saurischia and its relatives
Late CretaceousWhere Saurischia and its relatives were recorded in the Late Cretaceous.
Found in the same rock
860 taxa- Sauropoda61 sites
- Theropoda48 sites
- Rebbachisaurinae20 sites
- Prosauropoda19 sites
- Testudines19 sites
- Crocodylia16 sites
- Dinosauria14 sites
- Lepidotes14 sites
- Titanosauridae13 sites
- Ornithopoda12 sites
- Plantae12 sites
- Titanosauria12 sites
- Dromaeosauridae11 sites
- Lacertilia11 sites
- Actinopterygii10 sites
- Anura10 sites
- Phuwiangosaurus sirindhornae10 sites
- Osteichthyes9 sites
- Allosaurus8 sites
- Camarasaurus8 sites
- Coelurosauria8 sites
- Gastropoda8 sites
- Stegosaurus8 sites
- Tetanurae8 sites
The Paleobiology Database records at least 1,590 sites for Saurischia, and this reads 240 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
1,941 references- Fossils from the Elliot and Clarens Formations (Karoo Sequence) of the northeastern Cape, Orange Free State and Lesotho, and a suggested biozonation based on tetrapods86
- Paleoecological analysis of the vertebrate fauna of the Morrison Formation (Upper Jurassic), Rocky Mountain region, U.S.A.63
- Taxonomy of Late Jurassic diplodocid sauropods from Tendaguru (Tanzania)45
- Biostratigraphy of dinosaurs in the Upper Jurassic Morrison Formation of the Western Interior, U.S.A.44
- Die Gliedmaszen und Gliedmaszengürtel der Sauropoden der Tendaguru-Schichten [The limbs and limb girdles of the sauropods of the Tendaguru Beds]32
- Les Dinosauriens du "Continental intercalaire" du Saharal central [The dinosaurs of the "Continental Intercalaire" of the central Sahara]32
- New Balochisaurus (Balochisauridae, Titanosauria, Sauropoda) and Vitakridrinda (Theropoda) remains From Pakistan28
- Distribution and paleobiological significance of dinosaur tracks from the Jindong Formation (Albian) in Kosong County, Korea27
- Review of French dinosaur eggshells: morphology, structure, mineral, and organic composition26
- Upper Jurassic sauropod record in the Lusitanian Basin (Portugal): geographical and lithostratigraphical distribution24
- Les niveaux paléontologiques de première apparition des mammifères primoridaux en Afrique du Sud et leur ichnologie. Establissement de zones stratigraphiques detaillees dans le Stormberg du Lesotho (Afrique du Sud) (Trias Supérieur à Jurassique) [The paleontological levels of the first appearance of primordial mammals in southern Africa and their ichnology. Establishment of detailed stratigraphic zones in the Stormberg of Lesotho (southern Africa) (Upper Triassic to Jurassic).24
- Plateosaurus engelhardti Meyer, 1837 (Dinosauria: Sauropodomorpha) aus dem Feuerletten (Mittelkeuper; Obertrias) von Bayern23
Each of the 4,401 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. 1,929 further references are not listed. 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 content3
Picture of Saurischia
- Source
- Wikipedia/Commons
- Credit
- Auckland War Memorial Museum Tāmaki Paenga Hira
- Licence
- CC BY 4.0
- Commercial use
- the licence allows it
CT scan
- Source
- MorphoSource
- Licence
- In Copyright
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Saurischia indet. · amnh:farb:677
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
- Source
- Wikipedia, “Saurischia”
- 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 itDinosauria through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Seeley 1888)