Helicotomidae

Helicotomidae is an extinct family of Paleozoic molluscs (gastropods?) with anisostrophically coiled shells of uncertain position (Gastropoda?).

Helicotomidae

via iDigBio · via iDigBio. 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
EuomphaloideaPBDB
Diet
suspension feederPBDB, for Euomphaloidea
Life habit
epifaunalPBDB, for Euomphaloidea
Motility
stationaryPBDB, for Euomphaloidea
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 310 million years on record.

The record covers at least 481.7 Mya to 170.9 Mya. No occurrence read is dated outside 486.85 Mya to 168.2 Mya.

Cambrian — about 0 of 290 occurrencesOrdovician — about 282 of 290 occurrencesOrdovicianSilurian — about 5 of 290 occurrencesDevonian — about 2 of 290 occurrencesDevonianCarboniferous — about 0 of 290 occurrencesPermian — about 0 of 290 occurrencesEarly Triassic — about 0 of 290 occurrencesMiddle Triassic — about 0 of 290 occurrencesLate Triassic — about 0 of 290 occurrencesEarly Jurassic — about 0 of 290 occurrencesMiddle Jurassic — about 1 of 290 occurrences493–482 Mya — about 11 occurrences482–471 Mya — about 91 occurrences471–460 Mya — about 32 occurrences460–449 Mya — about 128 occurrences449–438 Mya — about 20 occurrences438–427 Mya — about 5 occurrences394–383 Mya — about 2 occurrences383–372 Mya — about 0.2 occurrences173–162 Mya — about 1 occurrence481.7 Mya170.9 Mya493 Mya162 Mya

290 occurrences of Helicotomidae 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

290 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

83 formations

Smithville — 37.33°N, 89.90°WSmithville — 37.30°N, 89.96°WSmithville — 37.41°N, 89.87°WSmithville — 37.35°N, 89.81°WSmithville — 37.21°N, 89.85°WSmithville — 37.16°N, 89.81°WCliffield — 37.09°N, 81.34°WCliffield — 37.15°N, 81.49°WCliffield — 37.08°N, 81.71°WCliffield — 37.13°N, 81.41°WCliffield — 37.17°N, 81.48°WKangaroo Creek — 41.36°N, 122.68°WKangaroo Creek — 41.39°N, 122.64°WWitten Limestone — 37.20°N, 81.36°WWitten Limestone — 37.11°N, 81.52°WWitten Limestone — 37.02°N, 81.63°WWitten Limestone — 37.00°N, 81.00°WWitten Limestone — 37.03°N, 81.79°WWitten Limestone — 37.10°N, 81.62°WChaumont — 45.45°N, 76.69°WChaumont — 45.88°N, 76.93°WChaumont — 45.41°N, 75.73°WChaumont — 45.43°N, 75.53°WChaumont — 45.47°N, 74.81°WAntelope Valley — 38.96°N, 116.49°WAntelope Valley — 36.88°N, 116.66°WAntelope Valley — 39.19°N, 116.38°WAntelope Valley — 39.00°N, 116.62°WDunleith — 42.00°N, 90.50°WCotter — 36.93°N, 93.06°WCotter — 36.60°N, 92.70°WCotter — 37.33°N, 89.93°WCape Weber — 73.78°N, 24.63°WCape Weber — 73.69°N, 24.63°WCape Weber — 73.53°N, 24.71°WMurfreesboro Limestone — 35.50°N, 86.50°WSt. Peter Sandstone — 44.92°N, 93.02°WSt. Peter Sandstone — 46.00°N, 94.00°WSt. Peter Sandstone — 42.00°N, 90.50°WQuimbys Mill — 42.00°N, 90.50°WQuimbys Mill — 41.85°N, 89.48°WBobcaygeon — 44.67°N, 78.80°WBobcaygeon — 44.53°N, 78.55°WBobcaygeon — 45.88°N, 76.93°WPort Clarence Limestone — 65.50°N, 165.92°WMcGregor — 42.73°N, 90.48°WMcGregor — 40.78°N, 87.39°WMcGregor — 42.51°N, 89.03°WMcGregor — 42.00°N, 89.39°WPlatteville — 46.00°N, 94.00°WPlatteville — 43.30°N, 91.78°WDecorah Shale — 46.00°N, 94.00°WDecorah Shale — 44.50°N, 92.90°WGrand Detour — 42.00°N, 90.50°WGrand Detour — 42.55°N, 89.23°WWise Lake — 42.00°N, 90.50°WVerulam — 44.45°N, 78.70°WVerulam — 44.43°N, 78.78°WRomaine — 50.30°N, 64.05°WBalclatchie — 54.48°N, 5.67°WBalclatchie — 55.23°N, 4.87°WNora — 23.05°S, 139.23°ENarwhale Sound — 74.08°N, 23.02°W

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The named rock units Helicotomidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 59 further formations hold fewer occurrences each and are not listed. 8 occurrences have no formation on record, which is common for older literature.

Helicotomidae and its relatives

Ordovician

Where Helicotomidae and its relatives were recorded in the Ordovician.

Found in the same rock

1,661 taxa

The Paleobiology Database records 186 sites for Helicotomidae, 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

67 references

Each of the 290 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. 55 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 Helicotomidae

Source
iDigBio
Credit
via iDigBio
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan of Helicotomidae 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 itEuomphaloidea through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Wenz 1938)