Circulus

Circulus is a genus of very small and minute sea snails with an operculum, marine gastropod mollusks in the family Vitrinellidae.

Circulus

Marie Hennion · CC BY 4.0 · 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
VitrinellidaePBDB
Life habit
epifaunalPBDB, for Gastropoda
Motility
actively mobilePBDB, for Gastropoda
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 65 million years on record.

The record covers at least 66 Mya to 129 ka. No occurrence read is dated outside 72.2 Mya to 11.7 ka.

Late Cretaceous — about 1 of 148 occurrencesLate CretaceousPaleocene — about 9 of 148 occurrencesPaleoceneEocene — about 17 of 148 occurrencesEoceneOligocene — about 6 of 148 occurrencesOligoceneMiocene — about 92 of 148 occurrencesMiocenePliocene — about 11 of 148 occurrencesPleistocene — about 12 of 148 occurrences74–71 Mya — about 0.2 occurrences71–69 Mya — about 0.4 occurrences69–66 Mya — about 0.4 occurrences66–64 Mya — about 4 occurrences64–61 Mya — about 4 occurrences61–59 Mya — about 1 occurrence59–56 Mya — about 0.5 occurrences56–54 Mya — about 0.8 occurrences54–52 Mya — about 0.8 occurrences52–49 Mya — about 0.8 occurrences49–47 Mya — about 0.7 occurrences47–44 Mya — about 0.6 occurrences44–42 Mya — about 0.6 occurrences42–39 Mya — about 6 occurrences39–37 Mya — about 6 occurrences37–34 Mya — about 0.6 occurrences34–32 Mya — about 0.1 occurrences29–27 Mya — about 0.4 occurrences27–25 Mya — about 3 occurrences25–22 Mya — about 4 occurrences22–20 Mya — about 6 occurrences20–17 Mya — about 7 occurrences17–15 Mya — about 20 occurrences15–12 Mya — about 35 occurrences12–9.8 Mya — about 14 occurrences9.8–7.4 Mya — about 5 occurrences7.4–4.9 Mya — about 2 occurrences4.9–2.5 Mya — about 11 occurrences2.5–0 Mya — about 12 occurrences66 Mya129 ka74 Mya0 Mya

148 occurrences of Circulus on record, most of them in the Miocene. 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

148 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

45 formations

Nyalindung — 7.00°S, 106.63°EBreda — 51.95°N, 6.75°EOak Grove — 30.92°N, 86.57°WShoal River — 30.72°N, 86.12°WJama — 0.18°S, 80.32°WBowden — 17.88°N, 76.28°WMoodys Branch — 32.30°N, 90.18°WMoodys Branch — 32.17°N, 88.83°WWerder — 52.98°N, 9.06°EGosport Sand — 31.55°N, 87.91°WCalcaire de Mons — 50.45°N, 3.93°EBerada — 51.10°N, 5.80°ELondon Clay — 51.08°N, 1.17°WLondon Clay — 51.23°N, 0.85°WArmuelles — 8.03°N, 82.92°WArmuelles — 10.17°N, 85.13°WDanian Limestone — 55.25°N, 12.13°EHückelhoven — 51.08°N, 6.32°EAgatdal — 70.60°N, 53.10°WEntrerriense — 42.25°S, 64.08°WChipola — 30.44°N, 85.19°WPallinup Siltstone — 35.02°S, 117.89°EMare — 10.00°N, 64.00°WAcredale — 36.79°N, 76.17°WCercado — 19.46°N, 71.10°WWaccamaw — 34.23°N, 77.94°WDuplin — 34.90°N, 78.05°W

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The named rock units Circulus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 21 further formations hold fewer occurrences each and are not listed. 63 occurrences have no formation on record, which is common for older literature.

Circulus and its relatives

Miocene

Where Circulus and its relatives were recorded in the Miocene.

Found in the same rock

2,027 taxa

The Paleobiology Database records 72 sites for Circulus, and this reads all 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

40 references

Each of the 148 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. 28 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 Circulus

Credit
Marie Hennion
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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 itVitrinellidae through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Jeffreys 1842)