Helicelasma

Helicelasma

via GBIF · CC BY-NC 4.0 · via GBIF. 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
StreptelasmatidaePBDB
Diet
suspension feederPBDB, for Rugosa
Life habit
epifaunalPBDB, for Rugosa
Motility
stationary, attachedPBDB, for Rugosa
Vision
blindPBDB, for Anthozoa
Environment
marinePBDB, for Rugosa

Time the record covers

At least 6.5 million years on record.

The record covers at least 449.6 Mya to 443.1 Mya. No occurrence read is dated outside 458.2 Mya to 432.9 Mya.

Ordovician — about 35 of 38 occurrencesOrdovicianSilurian — about 3 of 38 occurrencesSilurian459–458 Mya — about 0.1 occurrences458–457 Mya — about 0.2 occurrences457–456 Mya — about 0.2 occurrences456–455 Mya — about 0.2 occurrences455–454 Mya — about 0.2 occurrences454–453 Mya — about 0.2 occurrences453–453 Mya — about 0.2 occurrences453–452 Mya — about 0.2 occurrences452–451 Mya — about 0.2 occurrences451–450 Mya — about 0.8 occurrences450–449 Mya — about 4 occurrences449–448 Mya — about 5 occurrences448–447 Mya — about 5 occurrences447–446 Mya — about 5 occurrences446–446 Mya — about 5 occurrences446–445 Mya — about 3 occurrences445–444 Mya — about 4 occurrences444–443 Mya — about 3 occurrences443–442 Mya — about 0.5 occurrences442–441 Mya — about 0.5 occurrences441–440 Mya — about 0.4 occurrences440–439 Mya — about 0.2 occurrences439–439 Mya — about 0.2 occurrences439–438 Mya — about 0.2 occurrences438–437 Mya — about 0.2 occurrences437–436 Mya — about 0.2 occurrences436–435 Mya — about 0.2 occurrences435–434 Mya — about 0.2 occurrences434–433 Mya — about 0.2 occurrences433–432 Mya — about 0.1 occurrences449.6 Mya443.1 Mya458.7 Mya432.4 Mya

38 occurrences of Helicelasma on record, most of them in the Ordovician. 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

38 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

22 formations

Stonington — 45.67°N, 86.97°WStonington — 45.67°N, 86.93°WStonington — 45.93°N, 86.98°WLangara — 60.00°N, 11.00°ELangara — 59.88°N, 10.59°EGeorgian Bay — 45.75°N, 81.67°WGeorgian Bay — 43.67°N, 79.42°WScales — 40.00°N, 90.00°WLoka — 58.57°N, 15.07°ELangåra — 59.84°N, 10.51°EDillsboro — 39.16°N, 84.46°WArnheim — 35.50°N, 86.50°WFremont — 38.00°N, 105.00°WSaelabonn — 60.17°N, 10.30°ELiberty — 38.20°N, 85.57°WBig Hill — 45.83°N, 86.95°WRichmond — 45.75°N, 86.83°WBrainard — 40.00°N, 90.00°WWhitewater — 38.00°N, 85.50°WKuanyinchiao — 27.50°N, 108.23°EKhangay — 46.60°N, 93.27°EShihuichang — 36.00°N, 94.87°ELangøyene Sandstone — 59.85°N, 10.53°EVaureal — 49.67°N, 62.92°WMoyerokan — 67.31°N, 103.83°ERed River — 50.08°N, 96.70°W

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The named rock units Helicelasma has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 occurrences have no formation on record, which is common for older literature.

Helicelasma and its relatives

Ordovician

Where Helicelasma and its relatives were recorded in the Ordovician.

Found in the same rock

468 taxa

The Paleobiology Database records 36 sites for Helicelasma, 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

20 references

Each of the 38 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. 8 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 Helicelasma

Source
GBIF
Credit
via GBIF
Licence
CC BY-NC 4.0
Commercial use
the licence does not allow it

No 3D scan of Helicelasma was found in Smithsonian Open Access and Sketchfab.

MorphoSource was 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 itStreptelasmatidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Neuman 1969