Trigonia

Searched as Trigonia densestriata. The Paleobiology Database treats Trigonia as the accepted name.

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

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
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 most 2.3 million years on record.

The one occurrence read is dated to somewhere between 170.9 Mya and 168.6 Mya, which is a dating window rather than a span.

Middle Jurassic — about 1 of 1 occurrenceMiddle Jurassic171–171 Mya — about 0.0 occurrences171–171 Mya — about 0.0 occurrences171–171 Mya — about 0.0 occurrences171–171 Mya — about 0.0 occurrences171–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–170 Mya — about 0.0 occurrences170–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences169–169 Mya — about 0.0 occurrences171.4 Mya168.1 Mya

1 occurrence 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

1 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

1 formation

Lajas — 39.17°S, 70.07°W

Loading coastlines…

The named rock units Trigonia has been recovered from, largest first. Drawn where the rock is now, not where it formed.

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

1 reference

Each of the 1 occurrence 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content2

Picture of Trigonia

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 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 itTrigoniinae through timeFormations of the Middle JurassicThe world it lived on

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