Equisetales
Equisetales is an order of subclass Equisetidae with only one living family, Equisetaceae, containing the genus Equisetum (horsetails), as well as a variety of extinct groups, including the tree-like Calamitaceae.

Olivier Pichard · CC BY-SA 3.0 · 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
- EquisetidaePBDB
- Diet
- "photoautotroph"PBDB, for Streptophyta
Time the record covers
At least 358 million years on record.
The record covers at least 358.86 Mya to 129 ka. No occurrence read is dated outside 382.31 Mya to 0 Mya.
3,527 occurrences of Equisetales on record, most of them in the Permian. The Paleobiology Database records this as a living group. 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
3,527 occurrences- Devonianunder 1%
- Carboniferous17%
- Permian26%
- Early Triassic2%
- Middle Triassic3%
- Late Triassic16%
- Early Jurassic12%
- Middle Jurassic13%
- Late Jurassic4%
- Early Cretaceous2%
- Late Cretaceousunder 1%
- Paleocene1%
- Eocene2%
- Oligoceneunder 1%
- Mioceneunder 1%
- Plioceneunder 1%
- Pleistoceneunder 1%
- Holoceneunder 1%
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
733 formations
- Pottsville Formation102
- Cape Stewart Formation41
- Saltwick Formation · Ravenscar Group38
- Estcourt Formation · Beaufort Group34
- Molteno Formation · Stormberg Group31
- Fort Union Formation29
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The named rock units Equisetales has been recovered from, largest first. Drawn where the rock is now, not where it formed. 709 further formations hold fewer occurrences each and are not listed. 1,138 occurrences have no formation on record, which is common for older literature.
Equisetales and its relatives
PermianWhere Equisetales and its relatives were recorded in the Permian.
Found in the same rock
870 taxa- Equisetum57 sites
- Neuropteris51 sites
- Calamites48 sites
- Pecopteris47 sites
- Sphenophyllum45 sites
- Annularia37 sites
- Sphenopteris37 sites
- Cordaites36 sites
- Pecopteris (Alethopteris)35 sites
- Phyllotheca australis33 sites
- Lepidodendron31 sites
- Asterophyllites28 sites
- Pteridophyta28 sites
- Taeniopteris28 sites
- Sigillaria26 sites
- Glyptostrobus europaeus25 sites
- Lepidopteris24 sites
- Gymnospermopsida22 sites
- Neomariopteris lobifolia22 sites
- Odontopteris22 sites
- Sphenobaiera22 sites
- Dicroidium21 sites
- Mariopteris20 sites
- Averrhoites affinis19 sites
The Paleobiology Database records at least 1,063 sites for Equisetales, 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
597 references- Triassic Floras of Eurasia92
- Anderson and Anderson, 198581
- The Stratigraphic Tables of Xinjiang79
- A Catalogue of Indian Fossil Plants75
- Kompleksy rasteniy; sporovo-pyl'tsevyye kompleksy63
- Stratigraphische Grundlagen des Stefan C und Rotliegenden im Thuringer Wald59
- Triassic Floras of Eurasia51
- A paleoecological study of an in situ peat-forming Carboniferous forest in the Black Warrior Basin, Alabama50
- The Stratigraphic Tables of Sichuan48
- A paleontological study of an Early Pennsylvanian forest preserved above the Blue Creek Coal seam, Pottsville, Formation, Northwestern Alabama47
- Regional Geology of Henan province43
- Provincialism in Gondwana floras42
Each of the 3,527 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. 585 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 content1
Picture of Equisetales
- Source
- Wikipedia/Commons
- Credit
- Olivier Pichard
- Licence
- CC BY-SA 3.0
- Commercial use
- the licence allows it
No 3D scan of Equisetales 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.
The description on this site
- Source
- Wikipedia, “Equisetales”
- 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 itEquisetidae through timeFormations of the PermianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Dumortier 1829