Helisoma

Helisoma is a genus of freshwater air-breathing snails, pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails.

Helisoma

Menke, 1830 · CC0 · 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
CoretiniPBDB
Life habit
epifaunalPBDB, for Gastropoda
Motility
actively mobilePBDB, for Gastropoda
Vision
limitedPBDB, for Gastropoda
Environment
freshwaterPBDB, for Planorbidae

Time the record covers

At least 61 million years on record.

The record covers at least 61.66 Mya to 129 ka. No occurrence read is dated outside 66 Mya to 11.7 ka.

Late Cretaceous — about 0 of 36 occurrencesPaleocene — about 2 of 36 occurrencesPaleoceneEocene — about 0 of 36 occurrencesOligocene — about 2 of 36 occurrencesOligoceneMiocene — about 2 of 36 occurrencesMiocenePliocene — about 3 of 36 occurrencesPleistocene — about 27 of 36 occurrences67–65 Mya — about 0.4 occurrences65–63 Mya — about 1 occurrence63–61 Mya — about 0.5 occurrences36–34 Mya — about 0.0 occurrences34–31 Mya — about 0.4 occurrences31–29 Mya — about 0.4 occurrences29–27 Mya — about 0.4 occurrences27–25 Mya — about 0.4 occurrences25–22 Mya — about 0.4 occurrences22–20 Mya — about 0.2 occurrences20–18 Mya — about 0.2 occurrences18–16 Mya — about 0.2 occurrences16–13 Mya — about 0.5 occurrences13–11 Mya — about 0.4 occurrences11–9.0 Mya — about 0.3 occurrences9.0–6.7 Mya — about 0.2 occurrences6.7–4.5 Mya — about 0.8 occurrences4.5–2.2 Mya — about 3 occurrences2.2–0 Mya — about 26 occurrences61.66 Mya129 ka67 Mya0 Mya

36 occurrences of Helisoma on record, most of them in the Pleistocene. 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

36 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

12 formations

Caloosahatchee — 26.89°N, 82.01°WCaloosahatchee — 26.96°N, 81.17°WFort Thompson — 26.96°N, 81.17°WShuler — 32.71°N, 96.71°WPebas — 3.50°S, 73.05°WPebas — 4.17°S, 72.38°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes — 33.63°N, 117.90°WPozo — 6.58°S, 76.28°WMingshui — 46.21°N, 124.27°EBermont — 26.89°N, 82.01°WSan Pedro Sand — 33.74°N, 118.28°WLas Piedras — 9.97°N, 63.62°WAlturas — 40.16°N, 120.27°W

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The named rock units Helisoma has been recovered from, largest first. Drawn where the rock is now, not where it formed. 11 occurrences have no formation on record, which is common for older literature.

Helisoma and its relatives

Pleistocene

Where Helisoma and its relatives were recorded in the Pleistocene.

Found in the same rock

1,419 taxa

The Paleobiology Database records 30 sites for Helisoma, 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

19 references

Each of the 36 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. 7 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 Helisoma

Credit
Menke, 1830
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Helisoma 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 itCoretini through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Swainson 1940