Isognomon

Isognomon is a genus of marine bivalve mollusks which is related to the pearl oysters.

Isognomon

Brocken Inaglory / Brocken Inaglory · CC BY-SA 3.0 · 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
IsognomoninaePBDB
Diet
suspension feederPBDB
Life habit
epifaunalPBDB
Motility
stationary, attachedPBDB
Vision
blindPBDB, for Bivalvia
Environment
marine,brackishPBDB, for Ostreida

Time the record covers

At least 251 million years on record.

The record covers at least 251.902 Mya to 129 ka. No occurrence read is dated outside 254.14 Mya to 11.7 ka.

Permian — about 3 of 576 occurrencesEarly Triassic — about 0 of 576 occurrencesMiddle Triassic — about 0 of 576 occurrencesLate Triassic — about 18 of 576 occurrencesLate TriassicEarly Jurassic — about 63 of 576 occurrencesEarly JurassicMiddle Jurassic — about 42 of 576 occurrencesLate Jurassic — about 216 of 576 occurrencesEarly Cretaceous — about 48 of 576 occurrencesEarly CretaceousLate Cretaceous — about 35 of 576 occurrencesLate CretaceousPaleocene — about 6 of 576 occurrencesEocene — about 20 of 576 occurrencesEoceneOligocene — about 9 of 576 occurrencesMiocene — about 89 of 576 occurrencesPliocene — about 12 of 576 occurrencesPleistocene — about 15 of 576 occurrences259–251 Mya — about 3 occurrences242–233 Mya — about 2 occurrences233–225 Mya — about 1 occurrence225–216 Mya — about 4 occurrences216–207 Mya — about 6 occurrences207–199 Mya — about 10 occurrences199–190 Mya — about 19 occurrences190–181 Mya — about 35 occurrences181–173 Mya — about 4 occurrences173–164 Mya — about 39 occurrences164–156 Mya — about 77 occurrences156–147 Mya — about 91 occurrences147–138 Mya — about 59 occurrences138–130 Mya — about 12 occurrences130–121 Mya — about 7 occurrences121–112 Mya — about 14 occurrences112–104 Mya — about 5 occurrences104–95 Mya — about 7 occurrences95–86 Mya — about 4 occurrences86–78 Mya — about 7 occurrences78–69 Mya — about 12 occurrences69–60 Mya — about 10 occurrences60–52 Mya — about 5 occurrences52–43 Mya — about 5 occurrences43–35 Mya — about 12 occurrences35–26 Mya — about 8 occurrences26–17 Mya — about 23 occurrences17–8.6 Mya — about 49 occurrences8.6–0 Mya — about 46 occurrences251.902 Mya129 ka259 Mya0 Mya

576 occurrences of Isognomon on record, most of them in the Late Jurassic. 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

576 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

150 formations

Kap Leslie — 70.48°N, 21.97°WChoptank — 38.53°N, 76.52°WChoptank — 38.38°N, 76.50°WChoptank — 38.39°N, 76.57°WChoptank — 38.73°N, 76.02°WChoptank — 38.62°N, 76.12°WChoptank — 38.38°N, 76.38°WCarmel — 37.70°N, 113.05°WCarmel — 37.59°N, 113.06°WCarmel — 37.51°N, 113.13°WCarmel — 37.25°N, 113.52°WCarmel — 39.17°N, 110.73°WCarmel — 39.04°N, 110.40°WCarmel — 38.90°N, 110.45°WCarmel — 38.71°N, 110.55°WCarmel — 38.74°N, 110.52°WCarmel — 38.59°N, 110.78°WCarmel — 38.22°N, 111.15°WCarmel — 37.93°N, 111.66°WCarmel — 37.27°N, 112.52°WCarmel — 37.31°N, 112.59°WCarmel — 37.22°N, 112.68°WCarmel — 37.25°N, 112.90°WTrigonia clavellata — 50.80°N, 2.28°WTrigonia clavellata — 50.60°N, 2.45°WPiedra Pintada — 40.12°S, 70.27°WPiedra Pintada — 39.97°S, 70.47°WPiedra Pintada — 40.05°S, 70.35°WPiedra Pintada — 40.15°S, 70.30°WEastover — 37.22°N, 76.93°WEastover — 36.44°N, 77.10°WEastover — 37.29°N, 77.25°WEastover — 37.10°N, 76.39°WEastover — 37.17°N, 76.77°WEastover — 38.07°N, 76.92°WEastover — 37.51°N, 77.21°WEastover — 37.27°N, 76.57°WEastover — 37.55°N, 77.06°WSobral — 39.10°N, 9.27°WSobral — 38.97°N, 9.10°WArgiles a Lopha gregarea — 49.30°N, 0.07°WAtherfield Clay — 50.60°N, 1.32°WAtherfield Clay — 51.28°N, 0.53°EAtherfield Clay — 51.23°N, 0.22°WAtherfield Clay — 51.23°N, 0.58°WAtherfield Clay — 50.61°N, 1.36°WAlcobaca — 39.32°N, 9.35°WAlcobaca — 38.42°N, 9.22°WAlcobaca — 39.52°N, 9.13°WKirkwood — 39.43°N, 75.23°WKirkwood — 39.47°N, 75.35°WKirkwood — 39.46°N, 75.30°WKirkwood — 39.36°N, 74.42°WKirkwood — 39.15°N, 74.69°WKirkwood — 39.08°N, 74.82°WKirkwood — 39.00°N, 75.12°WCalvert — 38.54°N, 76.73°WCalvert — 39.20°N, 75.60°WCalvert — 38.63°N, 76.51°WCalvert — 38.53°N, 76.52°WCalvert — 38.17°N, 76.80°WCalvert — 38.67°N, 76.53°WMaéjima — 34.60°N, 134.17°ECalcaire a oolithes ferrugineuses — 49.30°N, 0.07°WVaqueros — 33.64°N, 117.59°WVaqueros — 35.31°N, 120.04°WVaqueros — 35.25°N, 120.05°WVaqueros — 35.25°N, 120.06°WPigeon Point — 37.19°N, 122.40°WKahuitara Tuff — 44.33°S, 176.00°WKahuitara Tuff — 44.33°S, 176.25°EOsmington Oolite — 50.80°N, 2.28°WOsmington Oolite — 51.75°N, 1.25°WLourinhã — 39.10°N, 9.27°WLourinhã — 39.22°N, 9.34°WCape Stewart Beds — 70.44°N, 22.64°WCape Stewart Beds — 70.46°N, 22.71°WCape Stewart Beds — 70.47°N, 22.64°WCoralline Oolite — 54.23°N, 0.43°WCoralline Oolite — 53.97°N, 1.08°WCoralline Oolite — 53.98°N, 1.53°WCoralline Oolite — 54.21°N, 0.29°WCoral Rag de Trouville — 48.60°N, 0.63°ECoral Rag de Trouville — 49.32°N, 0.03°ECoral Rag de Trouville — 49.37°N, 0.08°ECoral Rag de Trouville — 49.30°N, 0.07°WNothe Grits — 50.63°N, 2.37°WNothe Grits — 50.80°N, 2.28°WMontejunto — 39.50°N, 9.15°W

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The named rock units Isognomon has been recovered from, largest first. Drawn where the rock is now, not where it formed. 126 further formations hold fewer occurrences each and are not listed. 115 occurrences have no formation on record, which is common for older literature.

Isognomon and its relatives

Late Jurassic

Where Isognomon and its relatives were recorded in the Late Jurassic.

Found in the same rock

1,345 taxa

The Paleobiology Database records 498 sites for Isognomon, and this reads 240 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

176 references

Each of the 576 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. 164 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 content3

Picture of Isognomon

Credit
Brocken Inaglory / Brocken Inaglory
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Isognomon radiatus · FMNH:Invertebrate Zoology:183228

3D model

Source
Sketchfab
Licence
CC0 Public Domain
Commercial use
the licence allows it

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 itIsognomoninae through timeFormations of the Late JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Lightfoot 1786