Trigonarca

Trigonarca

via iDigBio · CC0 · via iDigBio. 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
ArcullaeinaePBDB
Diet
suspension feederPBDB, for Glycymerididae
Life habit
semi-infaunalPBDB, for Glycymerididae
Motility
facultatively mobilePBDB, for Glycymerididae
Vision
blindPBDB, for Bivalvia
Environment
coastal,inner shelf,outer shelf,oceanicPBDB, for Glycymerididae

Time the record covers

At least 99 million years on record.

The record covers at least 165.3 Mya to 66 Mya. No occurrence read is dated outside 168.2 Mya to 61.66 Mya.

Middle Jurassic — about 2 of 170 occurrencesLate Jurassic — about 0 of 170 occurrencesEarly Cretaceous — about 11 of 170 occurrencesEarly CretaceousLate Cretaceous — about 156 of 170 occurrencesLate CretaceousPaleocene — about 1 of 170 occurrences170–167 Mya — about 1 occurrence167–163 Mya — about 0.9 occurrences144–141 Mya — about 0.1 occurrences141–137 Mya — about 0.2 occurrences137–133 Mya — about 1 occurrence133–130 Mya — about 0.4 occurrences130–126 Mya — about 0.2 occurrences126–122 Mya — about 0.0 occurrences122–119 Mya — about 0.7 occurrences119–115 Mya — about 0.9 occurrences115–111 Mya — about 0.9 occurrences111–108 Mya — about 2 occurrences108–104 Mya — about 2 occurrences104–100 Mya — about 3 occurrences100–96 Mya — about 9 occurrences96–93 Mya — about 20 occurrences93–89 Mya — about 39 occurrences89–85 Mya — about 14 occurrences85–82 Mya — about 11 occurrences82–78 Mya — about 10 occurrences78–74 Mya — about 10 occurrences74–71 Mya — about 15 occurrences71–67 Mya — about 22 occurrences67–63 Mya — about 6 occurrences63–60 Mya — about 0.4 occurrences165.3 Mya66 Mya170 Mya60 Mya

170 occurrences of Trigonarca 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

170 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

36 formations

Ladd — 33.70°N, 117.60°WLadd — 33.75°N, 117.65°WBlack Creek — 35.77°N, 78.64°WBlack Creek — 34.68°N, 78.23°WBlack Creek — 34.58°N, 78.27°WBlack Creek — 35.23°N, 77.79°WBlack Creek — 35.46°N, 77.68°WBlack Creek — 35.67°N, 77.47°WMungo River — 4.49°N, 9.49°EMungo River — 4.44°N, 9.49°EKarai — 11.21°N, 78.98°ERedding — 40.65°N, 122.25°WRedding — 40.67°N, 122.26°WMancos Shale — 35.73°N, 106.90°WMancos Shale — 35.78°N, 106.94°WEutaw — 32.46°N, 84.99°WEutaw — 32.35°N, 85.36°WMikasa Sandstone — 43.25°N, 141.95°ETuxedni — 61.92°N, 148.17°WTuxedni — 59.77°N, 153.26°WLogbadjeck — 3.92°N, 10.04°EMerchantville — 39.95°N, 74.99°WMerchantville — 40.14°N, 74.72°WSnow Hill — 34.65°N, 78.25°WSalinas — 14.25°S, 12.36°ESalinas — 14.19°S, 12.33°EAnacacho Limestone — 29.35°N, 99.14°WBlackdown Greensand — 52.63°N, 1.13°WHagino — 33.50°N, 133.67°EIshido — 36.25°N, 138.67°ELa Mesa — 5.25°S, 81.13°WEl Cenizo — 5.25°S, 81.13°WBranderfleck — 47.67°N, 12.17°EBaba Darves — 36.78°N, 69.95°EBeer Head Limestone — 50.75°N, 2.33°WPindiga — 9.98°N, 10.93°EIndidura — 29.35°N, 101.05°W

Loading coastlines…

The named rock units Trigonarca has been recovered from, largest first. Drawn where the rock is now, not where it formed. 12 further formations hold fewer occurrences each and are not listed. 58 occurrences have no formation on record, which is common for older literature.

Trigonarca and its relatives

Late Cretaceous

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

Found in the same rock

1,234 taxa

The Paleobiology Database records 136 sites for Trigonarca, and this reads all 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

48 references

Each of the 170 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. 36 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 Trigonarca

Source
iDigBio
Credit
via iDigBio
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Trigonarca was found in MorphoSource and Sketchfab.

Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itArcullaeinae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Conrad 1862)