Trigonulina

Trigonulina is a genus of small carnivorous bivalves in the family Verticordiidae. It was first named by Alcide d'Orbigny with the type taxon T. ornata in 1853, though T. novemcostata was named first originally as Hippagus novemcostatus in 1850 which is now unaccepted. Trigonulina shells are known to be extremely small, ranging from about 1-3.6 millimeters long. They live at depths of 18-850 meters below the ocean's surface and burrow under sand to feed on microscopic crustaceans using adapted inhalant siphons. T. canaliculata and T. ornata live in the western Atlantic Ocean while T. novemcostata is native to the South China Sea.

No picture of Trigonulina was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Trigonulina, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
VerticordiidaePBDB
Diet
carnivorePBDB
Life habit
infaunalPBDB
Motility
facultatively mobilePBDB
Vision
blindPBDB, for Bivalvia

Time the record covers

At least 47 million years on record.

The record covers at least 48.07 Mya to 129 ka. No occurrence read is dated outside 56 Mya to 11.7 ka.

Paleocene — about 0 of 60 occurrencesEocene — about 7 of 60 occurrencesEoceneOligocene — about 0 of 60 occurrencesMiocene — about 19 of 60 occurrencesMiocenePliocene — about 24 of 60 occurrencesPleistocene — about 10 of 60 occurrences57–55 Mya — about 0.2 occurrences55–53 Mya — about 0.5 occurrences53–51 Mya — about 0.5 occurrences51–50 Mya — about 0.5 occurrences50–48 Mya — about 0.4 occurrences48–46 Mya — about 0.3 occurrences46–44 Mya — about 0.3 occurrences44–42 Mya — about 0.3 occurrences42–40 Mya — about 1 occurrence40–38 Mya — about 2 occurrences38–36 Mya — about 0.4 occurrences21–19 Mya — about 0.6 occurrences19–17 Mya — about 0.9 occurrences17–15 Mya — about 0.5 occurrences13–11 Mya — about 0.1 occurrences11–9.5 Mya — about 0.9 occurrences9.5–7.6 Mya — about 0.9 occurrences7.6–5.7 Mya — about 12 occurrences5.7–3.8 Mya — about 10 occurrences3.8–1.9 Mya — about 18 occurrences1.9–0 Mya — about 9 occurrences48.07 Mya129 ka57 Mya0 Mya

60 occurrences of Trigonulina on record, most of them in the Pliocene. 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

60 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

27 formations

Gurabo — 19.30°N, 71.67°WGurabo — 19.30°N, 70.50°WGurabo — 19.53°N, 71.33°WGurabo — 18.93°N, 71.62°WGurabo — 19.48°N, 71.17°WCayo Agua — 9.18°N, 82.05°WCayo Agua — 9.15°N, 82.03°WEscudo de Veraguas — 9.09°N, 81.55°WEscudo de Veraguas — 9.10°N, 81.57°WBowden — 17.88°N, 76.28°WCook Mountain — 32.17°N, 88.83°WCook Mountain — 31.97°N, 88.71°WCook Mountain — 31.76°N, 92.96°WChipola — 30.44°N, 85.19°WCaloosahatchee — 27.77°N, 82.68°WCaloosahatchee — 26.80°N, 81.37°WMoin — 9.99°N, 83.05°WMoin — 10.01°N, 83.06°WCrockett — 30.63°N, 96.54°WCrockett — 32.35°N, 92.72°WNancy Point — 9.15°N, 81.95°WCercado — 19.52°N, 71.28°WCercado — 19.58°N, 71.04°WMao — 19.55°N, 71.19°WReklaw — 30.80°N, 96.72°WReklaw — 30.01°N, 97.25°WWaccamaw — 34.23°N, 77.94°WDuplin — 34.90°N, 78.05°WBermont — 26.68°N, 80.67°WRio Banano — 9.91°N, 83.07°WChagres Sandstone — 9.33°N, 80.00°WMare — 10.61°N, 63.52°WEsmeraldas — 0.85°N, 78.98°WShark Hole Point — 9.04°N, 81.74°WRio Gurabo — 19.50°N, 71.18°WTimms Point Silt — 33.73°N, 118.28°WLomita Marl — 33.75°N, 118.30°W

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The named rock units Trigonulina has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 further formations hold fewer occurrences each and are not listed.

Trigonulina and its relatives

Pliocene

Where Trigonulina and its relatives were recorded in the Pliocene.

Found in the same rock

2,244 taxa

The Paleobiology Database records 23 sites for Trigonulina, 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

17 references

Each of the 60 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. 5 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

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Trigonulina ornata · fmnh:invertebrate zoology:26387

No picture of Trigonulina was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Trigonulina, or no answer at all. This entry cannot say which.

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 itVerticordiidae through timeFormations of the PlioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (d'Orbigny 1946)