Alvania

Alvania is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae.

Alvania

Jan Delsing · 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
Sits inside
RissoidaePBDB
Diet
grazerPBDB, for Rissoidae
Life habit
epifaunalPBDB, for Rissoidae
Motility
actively mobilePBDB, for Rissoidae
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 72 million years on record.

The record covers at least 72.2 Mya to 11.7 ka. No occurrence read is dated outside 83.6 Mya to 0 Mya.

Late Cretaceous — about 15 of 350 occurrencesLate CretaceousPaleocene — about 10 of 350 occurrencesPaleoceneEocene — about 13 of 350 occurrencesEoceneOligocene — about 28 of 350 occurrencesOligoceneMiocene — about 127 of 350 occurrencesMiocenePliocene — about 45 of 350 occurrencesPleistocene — about 102 of 350 occurrences85–82 Mya — about 0.1 occurrences82–80 Mya — about 0.2 occurrences80–77 Mya — about 0.2 occurrences77–74 Mya — about 0.2 occurrences74–71 Mya — about 3 occurrences71–68 Mya — about 6 occurrences68–65 Mya — about 6 occurrences65–63 Mya — about 3 occurrences63–60 Mya — about 5 occurrences60–57 Mya — about 2 occurrences57–54 Mya — about 0.5 occurrences54–51 Mya — about 0.4 occurrences51–48 Mya — about 0.4 occurrences48–45 Mya — about 3 occurrences45–43 Mya — about 4 occurrences43–40 Mya — about 2 occurrences40–37 Mya — about 1 occurrence37–34 Mya — about 1 occurrence34–31 Mya — about 2 occurrences31–28 Mya — about 2 occurrences28–26 Mya — about 10 occurrences26–23 Mya — about 16 occurrences23–20 Mya — about 14 occurrences20–17 Mya — about 16 occurrences17–14 Mya — about 24 occurrences14–11 Mya — about 54 occurrences11–8.5 Mya — about 7 occurrences8.5–5.7 Mya — about 10 occurrences5.7–2.8 Mya — about 40 occurrences2.8–0 Mya — about 119 occurrences72.2 Mya11.7 ka85 Mya0 Mya

350 occurrences of Alvania 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

350 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

55 formations

Ortovero Clay — 44.10°N, 8.23°EMare — 10.00°N, 64.00°WMare — 10.61°N, 63.52°WMare — 10.64°N, 64.11°WTermofourà — 45.05°N, 7.80°ERipley — 34.49°N, 89.01°WRipley — 34.73°N, 88.95°WRipley — 35.29°N, 88.60°WFaluns de la Touraine — 47.40°N, 1.23°EUnnamed — 33.24°N, 119.51°WUnnamed — 33.24°N, 119.55°WLellinge Greensand — 55.71°N, 12.60°EFalun de Saucats — 44.66°N, 0.57°WWerder — 52.98°N, 9.06°EMarnes de Saint-Etienne-d’Orthe — 43.57°N, 1.10°WPanchina — 43.57°N, 10.35°EProvidence — 31.71°N, 85.09°WCorsicana Marl — 31.40°N, 96.73°WCorsicana Marl — 30.37°N, 97.45°WCorsicana Marl — 30.23°N, 97.52°WEscudo de Veraguas — 9.09°N, 81.55°WEscudo de Veraguas — 9.10°N, 81.57°WRifle Butts — 45.03°S, 170.02°ERifle Butts — 45.12°S, 170.93°EMoin — 10.01°N, 83.06°WMoin — 10.00°N, 83.04°WMonte Giogo — 44.85°N, 9.86°EAksucay — 37.27°N, 30.78°ECalcaire de Mons — 50.45°N, 3.93°EPlaya Grande — 10.00°N, 71.00°WGatun — 9.35°N, 79.81°WGatun — 9.30°N, 79.92°WShark Hole Point — 9.04°N, 81.75°WLillo — 51.25°N, 4.28°EFels — 48.50°N, 15.76°E

Loading coastlines…

The named rock units Alvania has been recovered from, largest first. Drawn where the rock is now, not where it formed. 31 further formations hold fewer occurrences each and are not listed. 207 occurrences have no formation on record, which is common for older literature.

Alvania and its relatives

Miocene

Where Alvania and its relatives were recorded in the Miocene.

Found in the same rock

2,114 taxa

The Paleobiology Database records 116 sites for Alvania, 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

84 references

Each of the 350 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. 72 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 Alvania

Credit
Jan Delsing
Licence
Public Domain
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 itRissoidae through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Risso 1826)