Rissoa

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

Rissoa

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 236 million years on record.

The record covers at least 237 Mya to 11.7 ka. No occurrence read is dated outside 241.464 Mya to 0 Mya.

Middle Triassic — about 2 of 217 occurrencesLate Triassic — about 1 of 217 occurrencesLate TriassicEarly Jurassic — about 0 of 217 occurrencesMiddle Jurassic — about 0 of 217 occurrencesLate Jurassic — about 1 of 217 occurrencesEarly Cretaceous — about 2 of 217 occurrencesEarly CretaceousLate Cretaceous — about 28 of 217 occurrencesLate CretaceousPaleocene — about 4 of 217 occurrencesEocene — about 24 of 217 occurrencesEoceneOligocene — about 48 of 217 occurrencesMiocene — about 19 of 217 occurrencesPliocene — about 17 of 217 occurrencesPleistocene — about 67 of 217 occurrences246–238 Mya — about 2 occurrences238–230 Mya — about 1 occurrence230–222 Mya — about 0.3 occurrences164–156 Mya — about 0.6 occurrences156–148 Mya — about 0.4 occurrences131–123 Mya — about 0.6 occurrences123–115 Mya — about 0.4 occurrences107–99 Mya — about 1 occurrence90–82 Mya — about 1 occurrence82–74 Mya — about 1 occurrence74–66 Mya — about 26 occurrences66–57 Mya — about 3 occurrences57–49 Mya — about 10 occurrences49–41 Mya — about 4 occurrences41–33 Mya — about 17 occurrences33–25 Mya — about 39 occurrences25–16 Mya — about 7 occurrences16–8.2 Mya — about 11 occurrences8.2–0 Mya — about 92 occurrences237 Mya11.7 ka246 Mya0 Mya

217 occurrences of Rissoa 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

217 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

Providence — 31.84°N, 85.22°WProvidence — 31.82°N, 84.97°WProvidence — 31.71°N, 85.09°WFalun de Jeurs — 48.48°N, 2.23°EFalun de Morigny — 48.45°N, 2.20°ECook Mountain — 31.03°N, 95.63°WCook Mountain — 31.20°N, 95.73°WCook Mountain — 30.63°N, 96.54°WCook Mountain — 30.62°N, 96.56°WCorsicana Marl — 32.53°N, 96.27°WCorsicana Marl — 32.20°N, 96.29°WCorsicana Marl — 31.40°N, 96.73°WCorsicana Marl — 30.37°N, 97.46°WFalun de Pierrefitte — 48.50°N, 2.25°EDry Creek Sands — 34.75°S, 138.68°EDry Creek Sands — 34.89°S, 138.56°EVistula — 53.94°N, 19.33°EAgueguexquite — 17.58°N, 95.08°WAgueguexquite — 18.14°N, 94.44°WAgueguexquite — 18.07°N, 94.32°WNorwich Crag — 52.58°N, 1.38°EBorgloon — 50.80°N, 5.33°EBorgloon — 50.82°N, 5.46°EBorgloon — 50.89°N, 5.64°EGhazij — 30.42°N, 70.51°ERhodes — 36.42°N, 28.20°EPrairie Bluff — 32.04°N, 86.79°WRipley — 35.23°N, 88.61°WRipley — 34.49°N, 89.01°WRipley — 35.32°N, 88.42°WFalun d'Auvers-Saint-Georges — 47.40°N, 4.45°EGniew — 53.85°N, 19.17°ELillo — 51.25°N, 4.28°EKaranga — 36.63°N, 52.20°EKef El Haroun — 33.58°N, 7.65°WLondon Clay — 51.08°N, 1.17°WLondon Clay — 51.23°N, 0.85°WConglomerat de Pierrefitte — 48.50°N, 2.25°EFalun d'Ormoy — 48.40°N, 2.15°ESable de Vauroux-Saint-Antoine — 48.43°N, 2.15°ESable de Vauroux-Saint-Antoine — 48.50°N, 2.25°E

Loading coastlines…

The named rock units Rissoa 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. 75 occurrences have no formation on record, which is common for older literature.

Rissoa and its relatives

Pleistocene

Where Rissoa and its relatives were recorded in the Pleistocene.

Found in the same rock

2,469 taxa

The Paleobiology Database records 135 sites for Rissoa, 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

73 references

Each of the 217 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. 61 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 Rissoa

Credit
Jan Delsing
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Rissoa 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 itRissoidae through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Desmarest 1814)