Trochidae

The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top.

Trochidae

GrahamBould · Public Domain · 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
Also called
top snailPBDB
Sits inside
TrochoideaPBDB
Diet
grazerPBDB
Life habit
epifaunalPBDB
Motility
actively mobilePBDB
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 358 million years on record.

The record covers at least 358.86 Mya to 11.7 ka. No occurrence read is dated outside 372.15 Mya to 0 Mya.

Devonian — about 1 of 2735 occurrencesCarboniferous — about 0 of 2735 occurrencesPermian — about 13 of 2735 occurrencesPermianEarly Triassic — about 3 of 2735 occurrencesMiddle Triassic — about 20 of 2735 occurrencesLate Triassic — about 53 of 2735 occurrencesLate TriassicEarly Jurassic — about 109 of 2735 occurrencesMiddle Jurassic — about 30 of 2735 occurrencesLate Jurassic — about 14 of 2735 occurrencesEarly Cretaceous — about 75 of 2735 occurrencesEarly CretaceousLate Cretaceous — about 76 of 2735 occurrencesLate CretaceousPaleocene — about 43 of 2735 occurrencesEocene — about 112 of 2735 occurrencesOligocene — about 118 of 2735 occurrencesMiocene — about 612 of 2735 occurrencesPliocene — about 417 of 2735 occurrencesPleistocene — about 996 of 2735 occurrences380–367 Mya — about 0.4 occurrences367–354 Mya — about 0.6 occurrences278–266 Mya — about 5 occurrences266–253 Mya — about 8 occurrences253–240 Mya — about 14 occurrences240–228 Mya — about 45 occurrences228–215 Mya — about 5 occurrences215–202 Mya — about 10 occurrences202–190 Mya — about 75 occurrences190–177 Mya — about 35 occurrences177–164 Mya — about 24 occurrences164–152 Mya — about 14 occurrences152–139 Mya — about 8 occurrences139–127 Mya — about 10 occurrences127–114 Mya — about 37 occurrences114–101 Mya — about 26 occurrences101–89 Mya — about 39 occurrences89–76 Mya — about 16 occurrences76–63 Mya — about 36 occurrences63–51 Mya — about 40 occurrences51–38 Mya — about 71 occurrences38–25 Mya — about 131 occurrences25–13 Mya — about 394 occurrences13–0 Mya — about 1692 occurrences358.86 Mya11.7 ka380 Mya0 Mya

2,735 occurrences of Trochidae 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

2,735 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

400 formations

Palos Verdes Sand — 33.80°N, 118.16°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.71°N, 118.27°WPalos Verdes Sand — 33.76°N, 118.28°WPalos Verdes Sand — 33.66°N, 117.94°WUnnamed — 33.24°N, 119.51°WUnnamed — 33.24°N, 119.55°WLomita Marl — 33.75°N, 118.30°WLomita Marl — 33.74°N, 118.28°WSan Pedro Sand — 33.74°N, 118.28°WSan Pedro Sand — 33.77°N, 118.31°WCassian — 46.68°N, 12.15°ECassian — 46.54°N, 11.62°ECassian — 46.51°N, 11.96°ECassian — 46.64°N, 12.20°ECassian — 46.53°N, 11.92°ECassian — 46.54°N, 12.25°ECassian — 46.57°N, 11.94°ETimms Point Silt — 33.73°N, 118.28°WPico — 34.36°N, 118.56°WPico — 34.33°N, 118.72°WPico — 34.43°N, 118.70°WPico — 34.35°N, 118.52°WPirabas — 0.80°S, 47.13°WPirabas — 1.00°S, 48.00°WPirabas — 1.23°S, 47.40°WPirabas — 0.48°S, 48.17°WPirabas — 1.05°S, 47.16°WPirabas — 0.60°S, 47.31°WPirabas — 2.58°S, 43.38°WPirabas — 1.66°S, 45.37°WFalun de Jeurs — 48.48°N, 2.23°ETalparo — 10.67°N, 61.07°WChoptank — 38.39°N, 76.57°WChoptank — 38.41°N, 76.48°WChoptank — 38.52°N, 76.51°WChoptank — 38.38°N, 76.38°WTermofourà — 45.05°N, 7.80°ETermofourà — 45.04°N, 7.77°EQuaternary terrace — 33.75°N, 118.33°WQuaternary terrace — 33.76°N, 118.35°WQuaternary terrace — 33.76°N, 118.34°WQuaternary terrace — 33.74°N, 118.41°WBowden — 17.88°N, 76.28°WCareaga Sandstone — 34.88°N, 120.51°WCareaga Sandstone — 34.84°N, 120.41°WCareaga Sandstone — 34.90°N, 120.32°WCareaga Sandstone — 34.74°N, 120.41°WEntrerriense — 42.25°S, 64.08°WEntrerriense — 42.17°S, 64.08°WShoal River — 30.72°N, 86.12°WShoal River — 30.72°N, 86.04°WShoal River — 30.65°N, 86.04°WShoal River — 30.63°N, 86.17°WShoal River — 30.69°N, 86.65°WChipola — 30.57°N, 85.84°WChipola — 30.44°N, 85.19°WChipola — 30.43°N, 84.98°WNavidad — 33.95°S, 71.87°WNavidad — 33.89°S, 71.83°WNavidad — 33.95°S, 71.87°WNavidad — 44.65°S, 74.58°WUpper Kalibeng — 7.49°S, 110.00°EUpper Kalibeng — 7.37°S, 111.32°ERhodes — 36.42°N, 28.20°EPalos Verdes — 33.63°N, 117.90°WKoronia — 35.08°N, 33.17°EKoronia — 35.03°N, 33.15°EKoronia — 35.05°N, 33.10°EKoronia — 35.05°N, 33.05°ECaloosahatchee — 26.89°N, 82.01°WCaloosahatchee — 26.96°N, 81.99°WCaloosahatchee — 27.77°N, 82.68°WCaloosahatchee — 26.96°N, 81.17°W

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The named rock units Trochidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 376 further formations hold fewer occurrences each and are not listed. 1,090 occurrences have no formation on record, which is common for older literature.

Trochidae and its relatives

Pleistocene

Where Trochidae and its relatives were recorded in the Pleistocene.

Found in the same rock

3,792 taxa

The Paleobiology Database records 1,058 sites for Trochidae, and this reads 240 of them. Of that, one read hit the database's own return limit, so every count below is a floor rather than a total. 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

568 references

Each of the 2,735 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. 556 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 content2

Picture of Trochidae

Credit
GrahamBould
Licence
Public Domain
Commercial use
the licence allows it

3D model

Source
Sketchfab
Credit
QQman
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

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 itTrochoidea through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Rafinesque 1815