Pterotrigonia

Pterotrigonia is an extinct genus of saltwater clams, marine bivalve molluscs in the family Megatrigoniidae. This genus is known in the fossil record from the Jurassic period Tithonian age to the Cretaceous period Maastrichtian age. Species in this genus were facultatively mobile infaunal suspension feeders. The type species of the genus is Pterotrigonia cristata.

Pterotrigonia

Hectonichus · 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
PterotrigoniinaePBDB
Diet
suspension feederPBDB, for Trigoniida
Life habit
infaunalPBDB, for Trigoniida
Motility
facultatively mobilePBDB, for Trigoniida
Vision
blindPBDB, for Bivalvia

Time the record covers

At least 89 million years on record.

The record covers at least 161.5 Mya to 72.2 Mya. No occurrence read is dated outside 201.4 Mya to 66 Mya.

Late Triassic — about 0 of 643 occurrencesEarly Jurassic — about 0 of 643 occurrencesEarly JurassicMiddle Jurassic — about 1 of 643 occurrencesMiddle JurassicLate Jurassic — about 14 of 643 occurrencesLate JurassicEarly Cretaceous — about 213 of 643 occurrencesEarly CretaceousLate Cretaceous — about 414 of 643 occurrencesLate CretaceousPaleocene — about 0 of 643 occurrences204–199 Mya — about 0.0 occurrences199–195 Mya — about 0.1 occurrences195–190 Mya — about 0.1 occurrences190–185 Mya — about 0.1 occurrences185–181 Mya — about 0.1 occurrences181–176 Mya — about 0.1 occurrences176–171 Mya — about 0.1 occurrences171–167 Mya — about 0.1 occurrences167–162 Mya — about 1.0 occurrences162–157 Mya — about 0.8 occurrences157–152 Mya — about 0.9 occurrences152–148 Mya — about 3 occurrences148–143 Mya — about 9 occurrences143–138 Mya — about 23 occurrences138–134 Mya — about 19 occurrences134–129 Mya — about 14 occurrences129–124 Mya — about 12 occurrences124–120 Mya — about 15 occurrences120–115 Mya — about 48 occurrences115–110 Mya — about 37 occurrences110–106 Mya — about 14 occurrences106–101 Mya — about 29 occurrences101–96 Mya — about 46 occurrences96–91 Mya — about 59 occurrences91–87 Mya — about 34 occurrences87–82 Mya — about 33 occurrences82–77 Mya — about 42 occurrences77–73 Mya — about 42 occurrences73–68 Mya — about 110 occurrences68–63 Mya — about 50 occurrences161.5 Mya72.2 Mya204 Mya63 Mya

643 occurrences of Pterotrigonia on record, most of them in the Late Cretaceous. 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

643 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

133 formations

Ladd — 33.73°N, 117.62°WLadd — 33.75°N, 117.68°WLadd — 33.75°N, 117.65°WProvidence — 31.94°N, 86.11°WProvidence — 31.84°N, 85.22°WProvidence — 31.78°N, 85.14°WProvidence — 31.75°N, 85.12°WProvidence — 31.82°N, 85.00°WEnokuchi — 32.31°N, 130.34°EEnokuchi — 32.34°N, 130.37°EHiraiga — 39.63°N, 141.95°EHiraiga — 40.00°N, 141.83°EHiraiga — 39.94°N, 141.94°EHiraiga — 39.83°N, 141.98°EHiraiga — 39.82°N, 141.88°ERedding — 40.64°N, 122.36°WRedding — 40.65°N, 122.25°WRedding — 40.67°N, 122.14°WRedding — 40.66°N, 122.26°WRedding — 40.64°N, 122.25°WRedding — 40.64°N, 122.23°WPrairie Bluff — 34.51°N, 88.92°WPrairie Bluff — 33.89°N, 88.96°WPrairie Bluff — 33.79°N, 88.91°WPrairie Bluff — 33.73°N, 88.90°WPrairie Bluff — 32.73°N, 88.30°WPrairie Bluff — 32.74°N, 88.36°WPrairie Bluff — 32.70°N, 88.17°WPrairie Bluff — 32.61°N, 88.24°WPrairie Bluff — 32.43°N, 88.04°WPrairie Bluff — 32.39°N, 87.92°WPrairie Bluff — 32.31°N, 87.80°WPrairie Bluff — 32.14°N, 87.42°WPrairie Bluff — 32.07°N, 87.33°WPrairie Bluff — 31.95°N, 86.70°WPrairie Bluff — 31.99°N, 85.92°WJalama — 34.50°N, 120.41°WJalama — 34.50°N, 120.34°WCorsicana Marl — 33.10°N, 95.99°WCorsicana Marl — 31.40°N, 96.73°WCorsicana Marl — 30.94°N, 96.95°WCorsicana Marl — 30.37°N, 97.46°WCorsicana Marl — 30.26°N, 97.54°WCorsicana Marl — 29.83°N, 97.84°WCorsicana Marl — 29.55°N, 98.13°WCorsicana Marl — 29.49°N, 98.19°WCorsicana Marl — 29.44°N, 98.56°WCorsicana Marl — 29.35°N, 98.88°WCorsicana Marl — 29.18°N, 99.02°WOwl Creek — 34.17°N, 88.89°WOwl Creek — 34.82°N, 88.88°WOwl Creek — 34.74°N, 88.90°WOwl Creek — 34.88°N, 88.87°WOwl Creek — 34.63°N, 88.84°WOwl Creek — 37.00°N, 89.85°WOwl Creek — 37.02°N, 89.85°WOwl Creek — 34.49°N, 89.00°WTanohata — 39.63°N, 141.78°ETanohata — 40.00°N, 141.83°ETanohata — 39.93°N, 141.94°EMatulla — 29.13°N, 33.28°EMatulla — 28.65°N, 33.24°EMatulla — 29.80°N, 33.52°EMatulla — 29.23°N, 33.18°EMatulla — 29.00°N, 33.50°EMatulla — 28.75°N, 33.65°ETuna Canyon — 34.12°N, 118.57°WTuna Canyon — 34.09°N, 118.55°WMarshalltown — 39.55°N, 75.70°WMarshalltown — 39.55°N, 75.65°WMikasa Sandstone — 43.25°N, 141.95°EMikasa Sandstone — 43.03°N, 141.95°EPanoche — 35.88°N, 120.10°WPanoche — 37.43°N, 121.27°WPanoche — 37.31°N, 121.30°WPanoche — 37.28°N, 121.21°WPanoche — 37.21°N, 121.22°WInca — 6.57°S, 78.73°WInca — 7.16°S, 78.51°WInca — 7.45°S, 78.18°WInca — 7.44°S, 78.40°WIshido — 36.25°N, 138.67°EIshido — 36.07°N, 138.87°EIshido — 36.07°N, 138.83°EMakatini — 27.36°S, 32.16°EMakatini — 27.53°S, 32.17°EGalala — 29.67°N, 34.50°EGalala — 30.38°N, 33.52°EGalala — 29.63°N, 34.40°EWilliams — 33.83°N, 117.66°WWilliams — 33.70°N, 117.63°WWilliams — 33.71°N, 117.71°WSidney Island — 48.60°N, 123.27°WChiwapa — 34.46°N, 88.90°WChiwapa — 34.38°N, 88.98°WChiwapa — 34.35°N, 88.92°WChiwapa — 34.19°N, 88.98°WPeedee — 33.83°N, 79.25°WPeedee — 33.86°N, 79.39°WPeedee — 35.77°N, 78.64°WPigeon Point — 37.19°N, 122.40°W

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The named rock units Pterotrigonia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 109 further formations hold fewer occurrences each and are not listed. 118 occurrences have no formation on record, which is common for older literature.

Pterotrigonia and its relatives

Late Cretaceous

Where Pterotrigonia and its relatives were recorded in the Late Cretaceous.

Found in the same rock

1,261 taxa

The Paleobiology Database records 491 sites for Pterotrigonia, and this reads 240 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

111 references

Each of the 643 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. 99 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 Pterotrigonia

Credit
Hectonichus
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

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 itPterotrigoniinae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. van Hoepen 1929