Helcionopsis

Helcionopsis is an extinct genus of paleozoic monoplacophoran in the family Tryblidiidae.

Helcionopsis

Uncredited · 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
TryblidiinaePBDB
Diet
grazerPBDB, for Tryblidiida
Life habit
epifaunalPBDB, for Tryblidiida
Motility
actively mobilePBDB, for Tryblidiida
Vision
blindPBDB, for Tergomya

Time the record covers

At least 21 million years on record.

The record covers at least 471.3 Mya to 449.6 Mya. No occurrence read is dated outside 483.4 Mya to 443.1 Mya.

Ordovician — about 20 of 20 occurrencesOrdovicianSilurian — about 0 of 20 occurrences484–483 Mya — about 0.0 occurrences483–481 Mya — about 0.1 occurrences481–480 Mya — about 0.1 occurrences480–479 Mya — about 0.1 occurrences479–477 Mya — about 0.1 occurrences477–476 Mya — about 0.1 occurrences476–474 Mya — about 0.1 occurrences474–473 Mya — about 0.1 occurrences473–472 Mya — about 0.1 occurrences472–470 Mya — about 0.0 occurrences458–456 Mya — about 2 occurrences456–455 Mya — about 3 occurrences455–453 Mya — about 3 occurrences453–452 Mya — about 3 occurrences452–451 Mya — about 3 occurrences451–449 Mya — about 3 occurrences449–448 Mya — about 0.2 occurrences448–446 Mya — about 0.2 occurrences446–445 Mya — about 0.2 occurrences445–444 Mya — about 0.2 occurrences444–442 Mya — about 0.1 occurrences471.3 Mya449.6 Mya484.2 Mya442.3 Mya

20 occurrences of Helcionopsis 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

20 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

16 formations

Dunleith — 42.00°N, 90.50°WGlenwood — 46.00°N, 94.00°WGlenwood — 42.00°N, 90.50°WIon — 42.00°N, 90.50°WWhitewater — 39.00°N, 84.00°WArnheim — 35.38°N, 88.00°WSt. Peter Sandstone — 46.00°N, 94.00°WPlatteville — 46.00°N, 94.00°WDecorah Shale — 46.00°N, 94.00°WCummingsville — 46.00°N, 94.00°WPecatonica — 42.00°N, 90.50°WMifflin — 42.00°N, 90.50°WSpechts Ferry — 42.00°N, 90.50°WGuttenberg — 42.00°N, 90.50°WShakopee — 45.05°N, 92.80°WMcGregor — 42.51°N, 89.03°WDecorah — 39.12°N, 90.97°W

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

Helcionopsis and its relatives

Ordovician

Where Helcionopsis and its relatives were recorded in the Ordovician.

Found in the same rock

319 taxa

The Paleobiology Database records 20 sites for Helcionopsis, 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

6 references

Each of the 20 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 Helcionopsis

Credit
nobody named on the record
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan of Helcionopsis 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

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 itTryblidiinae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Ulrich and Scofield 1897