Trigonia

Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae. The fossil range of the genus spans the Paleozoic, Mesozoic and Paleocene of the Cenozoic, from 298 to 56 Ma.

Trigonia

Uncredited · 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
TrigoniinaePBDB
Diet
suspension feederPBDB, for Trigoniidae
Life habit
shallow infaunalPBDB, for Trigoniidae
Motility
fast-movingPBDB, for Trigoniidae
Vision
blindPBDB, for Trigoniidae
Environment
marinePBDB, for Trigoniidae

Time the record covers

At least 227 million years on record.

The record covers at least 293.52 Mya to 66 Mya. No occurrence read is dated outside 298.9 Mya to 56 Mya.

Carboniferous — about 0 of 791 occurrencesPermian — about 1 of 791 occurrencesPermianEarly Triassic — about 0 of 791 occurrencesMiddle Triassic — about 2 of 791 occurrencesLate Triassic — about 29 of 791 occurrencesLate TriassicEarly Jurassic — about 100 of 791 occurrencesEarly JurassicMiddle Jurassic — about 343 of 791 occurrencesLate Jurassic — about 111 of 791 occurrencesEarly Cretaceous — about 139 of 791 occurrencesEarly CretaceousLate Cretaceous — about 66 of 791 occurrencesLate CretaceousPaleocene — about 1 of 791 occurrencesEocene — about 0 of 791 occurrences304–295 Mya — about 0.7 occurrences295–287 Mya — about 0.3 occurrences253–245 Mya — about 0.8 occurrences245–236 Mya — about 2 occurrences236–228 Mya — about 3 occurrences228–220 Mya — about 3 occurrences220–211 Mya — about 4 occurrences211–203 Mya — about 16 occurrences203–194 Mya — about 16 occurrences194–186 Mya — about 27 occurrences186–177 Mya — about 51 occurrences177–169 Mya — about 88 occurrences169–161 Mya — about 269 occurrences161–152 Mya — about 54 occurrences152–144 Mya — about 50 occurrences144–135 Mya — about 25 occurrences135–127 Mya — about 46 occurrences127–119 Mya — about 29 occurrences119–110 Mya — about 22 occurrences110–102 Mya — about 17 occurrences102–93 Mya — about 14 occurrences93–85 Mya — about 7 occurrences85–76 Mya — about 19 occurrences76–68 Mya — about 23 occurrences68–60 Mya — about 6 occurrences60–51 Mya — about 0.4 occurrences293.52 Mya66 Mya304 Mya51 Mya

791 occurrences of Trigonia on record, most of them in the Middle Jurassic. 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

791 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

185 formations

Carmel — 37.70°N, 113.05°WCarmel — 37.59°N, 113.06°WCarmel — 37.51°N, 113.13°WCarmel — 37.21°N, 113.30°WCarmel — 37.32°N, 113.85°WCarmel — 39.17°N, 110.74°WCarmel — 39.12°N, 110.75°WCarmel — 39.12°N, 110.75°WCarmel — 39.12°N, 110.86°WCarmel — 38.98°N, 110.88°WCarmel — 38.86°N, 110.91°WCarmel — 38.85°N, 110.90°WCarmel — 38.82°N, 111.00°WCarmel — 38.27°N, 110.51°WCarmel — 38.93°N, 110.42°WCarmel — 38.76°N, 110.47°WCarmel — 38.33°N, 111.52°WCarmel — 38.10°N, 111.93°WCarmel — 37.28°N, 112.51°WCarmel — 37.22°N, 112.68°WChari — 23.50°N, 70.50°ETwin Creek Limestone — 42.94°N, 110.51°WTwin Creek Limestone — 42.41°N, 111.04°WTwin Creek Limestone — 42.17°N, 110.83°WTwin Creek Limestone — 41.94°N, 110.86°WTwin Creek Limestone — 41.51°N, 111.30°WTwin Creek Limestone — 40.09°N, 111.38°WTwin Creek Limestone — 42.09°N, 110.46°WTwin Creek Limestone — 41.83°N, 110.87°WTwin Creek Limestone — 42.33°N, 110.50°WTwin Creek Limestone — 41.95°N, 110.46°WTwin Creek Limestone — 41.95°N, 110.45°WTwin Creek Limestone — 40.42°N, 110.80°WTwin Creek Limestone — 40.43°N, 110.72°WTwin Creek Limestone — 40.52°N, 110.43°WTwin Creek Limestone — 43.22°N, 110.65°WTwin Creek Limestone — 41.06°N, 111.54°WTwin Creek Limestone — 43.66°N, 111.33°WDhruma — 23.30°N, 46.33°EDhruma — 23.20°N, 46.33°EDhruma — 22.62°N, 46.00°EDhruma — 22.53°N, 46.17°EDhruma — 23.97°N, 46.17°EDhruma — 24.75°N, 46.00°EDhruma — 25.53°N, 45.00°EDhruma — 25.42°N, 45.00°EDhruma — 26.92°N, 44.00°EDhruma — 25.78°N, 45.25°EDhruma — 23.97°N, 46.00°EDhruma — 23.08°N, 46.33°EDhruma — 22.83°N, 46.83°EDhruma — 21.88°N, 45.83°EDhruma — 25.05°N, 45.67°EDhruma — 25.37°N, 45.50°EDhruma — 25.70°N, 45.67°EDhruma — 25.97°N, 45.00°EDhruma — 26.20°N, 44.83°EDhruma — 26.33°N, 44.83°ETataouine — 33.00°N, 10.47°ENayband — 32.50°N, 57.35°ENayband — 33.00°N, 57.00°ENayband — 32.35°N, 57.45°EMadbi — 14.27°N, 48.56°EMadbi — 14.32°N, 48.45°ESawtooth — 48.18°N, 112.88°WSawtooth — 47.63°N, 112.71°WSawtooth — 47.78°N, 112.69°WSawtooth — 46.72°N, 113.30°WLautaro — 29.36°S, 70.40°WLautaro — 29.36°S, 70.19°WLautaro — 29.47°S, 70.16°WLautaro — 29.44°S, 70.13°WLautaro — 28.14°S, 69.96°WLautaro — 28.31°S, 69.96°WLautaro — 28.16°S, 69.86°WAgrio — 38.98°S, 68.00°WAgrio — 37.80°S, 70.17°WAgrio — 38.73°S, 69.92°WAgrio — 38.15°S, 70.10°WCalcaires pseudo-oolithiques superieurs — 49.88°N, 4.09°ECalcaires pseudo-oolithiques superieurs — 49.63°N, 4.92°ECalcaires pseudo-oolithiques superieurs — 49.88°N, 4.04°ECalcaires pseudo-oolithiques superieurs — 49.68°N, 4.61°ECalcaires pseudo-oolithiques superieurs — 49.83°N, 4.21°ECalcaires pseudo-oolithiques superieurs — 49.60°N, 4.96°ECalcaires pseudo-oolithiques superieurs — 49.64°N, 4.73°EBarahona Limestone — 41.93°N, 3.15°WBarahona Limestone — 40.67°N, 1.20°WRio Tascadero — 30.77°S, 70.58°WRio Tascadero — 30.88°S, 70.53°WRio Tascadero — 30.89°S, 70.55°WRio Tascadero — 30.96°S, 70.57°WKoranga Sandstone — 38.50°S, 177.35°EKoranga Sandstone — 38.41°S, 177.31°EHabo beds — 23.20°N, 69.80°ETurmiel Fm — 40.40°N, 1.50°WDogger — 54.42°N, 0.93°WDogger — 54.50°N, 0.69°WCoffee Sand — 34.66°N, 88.57°WCoffee Sand — 34.45°N, 88.58°WWhite Limestone — 51.75°N, 1.17°WBlack Creek — 35.77°N, 78.64°WBlack Creek — 34.68°N, 78.23°WBlack Creek — 35.22°N, 77.68°WBlack Creek — 35.46°N, 77.68°WBlack Creek — 35.67°N, 77.47°WTuxedni — 62.17°N, 147.71°WTuxedni — 62.12°N, 147.70°WTuxedni — 59.80°N, 153.22°WTuxedni — 59.71°N, 153.26°WCalcaires marno-crayeux superieurs — 49.83°N, 4.20°ECalcaires marno-crayeux superieurs — 49.88°N, 4.09°ECalcaires marno-crayeux superieurs — 49.85°N, 4.16°ECalcaires marno-crayeux superieurs — 49.60°N, 4.80°EShuqra — 14.32°N, 48.45°EMount Laurel Sand — 39.55°N, 75.65°W

Loading coastlines…

The named rock units Trigonia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 161 further formations hold fewer occurrences each and are not listed. 241 occurrences have no formation on record, which is common for older literature.

Trigonia and its relatives

Middle Jurassic

Where Trigonia and its relatives were recorded in the Middle Jurassic.

Found in the same rock

1,619 taxa

The Paleobiology Database records 610 sites for Trigonia, 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

199 references

Each of the 791 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. 187 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 Trigonia

Credit
nobody named on the record
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

3D model

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

Smithsonian Open Access was 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 itTrigoniinae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Bruguière 1789