Arcida

The Arcida is an extant order of bivalve molluscs. This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size. The duplivincular ligament, taxodont dentition, and a shell microstructure consisting of the outer crossed lamellar and inner complex crossed lamellar layers are defining characters of this order.

Arcida

Wilson44691 · Public Domain · 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
PteriomorphiaPBDB
Diet
suspension feederPBDB
Life habit
semi-infaunalPBDB
Motility
facultatively mobilePBDB
Vision
blindPBDB, for Bivalvia

Time the record covers

At least 473 million years on record.

The record covers at least 473.8 Mya to 11.7 ka. No occurrence read is dated outside 477.1 Mya to 0 Mya.

Ordovician — about 29 of 12000 occurrencesOrdovicianSilurian — about 6 of 12000 occurrencesDevonian — about 66 of 12000 occurrencesDevonianCarboniferous — about 103 of 12000 occurrencesCarboniferousPermian — about 234 of 12000 occurrencesPermianEarly Triassic — about 5 of 12000 occurrencesMiddle Triassic — about 45 of 12000 occurrencesLate Triassic — about 99 of 12000 occurrencesEarly Jurassic — about 406 of 12000 occurrencesMiddle Jurassic — about 488 of 12000 occurrencesLate Jurassic — about 479 of 12000 occurrencesEarly Cretaceous — about 425 of 12000 occurrencesEarly CretaceousLate Cretaceous — about 2197 of 12000 occurrencesPaleocene — about 536 of 12000 occurrencesEocene — about 1106 of 12000 occurrencesOligocene — about 533 of 12000 occurrencesMiocene — about 2761 of 12000 occurrencesPliocene — about 1239 of 12000 occurrencesPleistocene — about 1173 of 12000 occurrences487–470 Mya — about 6 occurrences470–454 Mya — about 21 occurrences454–438 Mya — about 3 occurrences438–422 Mya — about 5 occurrences422–406 Mya — about 4 occurrences406–389 Mya — about 10 occurrences389–373 Mya — about 21 occurrences373–357 Mya — about 32 occurrences357–341 Mya — about 20 occurrences341–324 Mya — about 32 occurrences324–308 Mya — about 24 occurrences308–292 Mya — about 39 occurrences292–276 Mya — about 40 occurrences276–260 Mya — about 56 occurrences260–243 Mya — about 146 occurrences243–227 Mya — about 74 occurrences227–211 Mya — about 18 occurrences211–195 Mya — about 95 occurrences195–178 Mya — about 336 occurrences178–162 Mya — about 455 occurrences162–146 Mya — about 450 occurrences146–130 Mya — about 177 occurrences130–114 Mya — about 189 occurrences114–97 Mya — about 236 occurrences97–81 Mya — about 378 occurrences81–65 Mya — about 1803 occurrences65–49 Mya — about 596 occurrences49–32 Mya — about 1042 occurrences32–16 Mya — about 1376 occurrences16–0 Mya — about 4317 occurrences473.8 Mya11.7 ka487 Mya0 Mya

12,000+ occurrences of Arcida on record. 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

12,000 occurrences read

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. The read hit its cap, so every figure above is a floor and the shares are of the occurrences read. More on what this infers.

Found in

at least 1125 formations

Gatun — 9.35°N, 79.81°WGatun — 9.35°N, 79.82°WGatun — 9.04°N, 80.65°WGatun — 9.35°N, 79.85°WGatun — 9.28°N, 79.97°WGatun — 9.29°N, 79.92°WGatun — 9.17°N, 80.00°WGatun — 9.12°N, 80.33°WProvidence — 31.91°N, 86.17°WProvidence — 31.87°N, 86.08°WProvidence — 31.97°N, 86.00°WProvidence — 31.86°N, 85.95°WProvidence — 31.92°N, 85.82°WProvidence — 31.89°N, 85.70°WProvidence — 31.95°N, 85.68°WProvidence — 31.92°N, 85.35°WProvidence — 31.84°N, 85.22°WProvidence — 31.78°N, 85.14°WProvidence — 31.75°N, 85.12°WProvidence — 31.80°N, 85.00°WProvidence — 31.96°N, 85.45°WProvidence — 31.89°N, 85.21°WPrairie Bluff — 34.63°N, 88.84°WPrairie Bluff — 34.51°N, 88.92°WPrairie Bluff — 34.25°N, 88.97°WPrairie Bluff — 34.24°N, 89.00°WPrairie Bluff — 33.90°N, 88.98°WPrairie Bluff — 33.79°N, 88.97°WPrairie Bluff — 33.79°N, 88.91°WPrairie Bluff — 33.73°N, 88.91°WPrairie Bluff — 33.52°N, 88.84°WPrairie Bluff — 33.15°N, 88.67°WPrairie Bluff — 33.07°N, 88.61°WPrairie Bluff — 33.05°N, 88.56°WPrairie Bluff — 32.91°N, 88.51°WPrairie Bluff — 34.48°N, 88.98°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 — 32.49°N, 88.10°WPrairie Bluff — 32.43°N, 88.04°WPrairie Bluff — 32.39°N, 87.92°WPrairie Bluff — 32.31°N, 87.80°WPrairie Bluff — 32.23°N, 87.50°WPrairie Bluff — 32.14°N, 87.42°WPrairie Bluff — 32.07°N, 87.33°WPrairie Bluff — 32.04°N, 87.26°WPrairie Bluff — 32.05°N, 86.99°WPrairie Bluff — 32.05°N, 86.81°WPrairie Bluff — 32.05°N, 86.81°WPrairie Bluff — 31.97°N, 86.72°WPrairie Bluff — 32.00°N, 86.48°WPrairie Bluff — 31.98°N, 86.00°WPrairie Bluff — 31.98°N, 85.92°WChari — 23.30°N, 69.97°EChari — 23.50°N, 70.50°ECastilletes — 11.85°N, 71.33°WCastilletes — 11.93°N, 71.34°WCastilletes — 11.98°N, 71.29°WCastilletes — 11.92°N, 71.36°WCorsicana Marl — 33.53°N, 94.51°WCorsicana Marl — 33.51°N, 94.67°WCorsicana Marl — 33.10°N, 95.99°WCorsicana Marl — 32.86°N, 96.21°WCorsicana Marl — 32.85°N, 96.21°WCorsicana Marl — 32.53°N, 96.27°WCorsicana Marl — 32.19°N, 96.30°WCorsicana Marl — 32.06°N, 96.47°WCorsicana Marl — 31.82°N, 96.54°WCorsicana Marl — 31.74°N, 96.61°WCorsicana Marl — 31.52°N, 96.58°WCorsicana Marl — 31.40°N, 96.73°WCorsicana Marl — 31.12°N, 96.82°WCorsicana Marl — 30.94°N, 96.95°WCorsicana Marl — 30.44°N, 97.46°WCorsicana Marl — 30.37°N, 97.45°WCorsicana Marl — 30.30°N, 97.46°WCorsicana Marl — 30.23°N, 97.52°WCorsicana Marl — 30.16°N, 97.56°WCorsicana Marl — 29.95°N, 97.71°WCorsicana Marl — 29.83°N, 97.84°WCorsicana Marl — 29.72°N, 97.90°WCorsicana Marl — 29.60°N, 98.03°WCorsicana Marl — 29.63°N, 98.54°WCorsicana Marl — 29.59°N, 98.08°WCorsicana Marl — 29.55°N, 98.13°WCorsicana Marl — 29.35°N, 98.88°WCorsicana Marl — 29.18°N, 99.02°WCorsicana Marl — 31.30°N, 96.90°WKap Leslie — 70.48°N, 21.97°WCaloosahatchee — 25.95°N, 81.36°WCaloosahatchee — 25.91°N, 81.36°WCaloosahatchee — 25.75°N, 81.94°WCaloosahatchee — 26.89°N, 82.01°WCaloosahatchee — 26.77°N, 81.15°WCaloosahatchee — 26.70°N, 80.99°WCaloosahatchee — 26.34°N, 80.86°WCaloosahatchee — 26.76°N, 81.44°WCaloosahatchee — 27.77°N, 82.68°WCaloosahatchee — 26.96°N, 81.99°WCaloosahatchee — 26.75°N, 81.51°WCaloosahatchee — 26.76°N, 81.46°WCaloosahatchee — 26.96°N, 81.17°WCaloosahatchee — 26.75°N, 80.93°WCaloosahatchee — 26.79°N, 81.30°WCaloosahatchee — 26.13°N, 80.62°WShoal River — 30.72°N, 86.12°WShoal River — 30.72°N, 86.04°WShoal River — 30.65°N, 86.04°WShoal River — 30.63°N, 86.17°WShoal River — 30.69°N, 86.65°WWoodbine — 31.95°N, 97.32°WWoodbine — 32.73°N, 97.22°WWoodbine — 32.84°N, 97.08°WWoodbine — 32.77°N, 97.01°WWoodbine — 32.86°N, 97.06°WWoodbine — 32.99°N, 96.95°WWoodbine — 33.66°N, 96.91°WWoodbine — 33.71°N, 96.46°WWoodbine — 33.81°N, 96.83°WWoodbine — 33.76°N, 96.54°WWoodbine — 33.62°N, 96.61°WWoodbine — 33.66°N, 96.45°WWoodbine — 32.35°N, 97.39°WWoodbine — 32.74°N, 97.11°WWoodbine — 32.56°N, 97.14°WWoodbine — 32.65°N, 97.23°WWoodbine — 32.70°N, 97.45°WWoodbine — 33.05°N, 96.99°WWoodbine — 33.80°N, 96.85°WWoodbine — 33.73°N, 96.59°WWoodbine — 33.76°N, 96.67°WWoodbine — 33.71°N, 96.30°WWoodbine — 33.60°N, 96.37°WWoodbine — 33.87°N, 95.57°WWoodbine — 33.86°N, 95.25°WCook Mountain — 31.29°N, 86.56°WCook Mountain — 31.31°N, 86.48°WCook Mountain — 31.75°N, 92.97°WCook Mountain — 32.35°N, 92.72°WCook Mountain — 32.32°N, 89.03°WCook Mountain — 32.04°N, 88.73°WCook Mountain — 32.10°N, 88.86°WCook Mountain — 32.32°N, 89.15°WCook Mountain — 32.36°N, 92.98°WCook Mountain — 32.52°N, 93.73°WCook Mountain — 31.26°N, 93.82°WCook Mountain — 30.00°N, 97.14°WCook Mountain — 30.67°N, 96.37°WCook Mountain — 30.90°N, 96.39°WCook Mountain — 30.36°N, 96.82°WCook Mountain — 31.96°N, 95.27°WCook Mountain — 30.11°N, 97.32°WCook Mountain — 30.63°N, 96.33°WCook Mountain — 30.50°N, 96.63°WCook Mountain — 32.52°N, 92.64°WCook Mountain — 30.30°N, 96.96°WCook Mountain — 31.61°N, 93.40°WCook Mountain — 31.47°N, 93.57°WCook Mountain — 31.93°N, 92.64°WCook Mountain — 31.43°N, 93.85°WCook Mountain — 32.17°N, 88.83°WCook Mountain — 32.14°N, 89.00°WCook Mountain — 32.10°N, 92.66°WCook Mountain — 31.35°N, 93.65°WCook Mountain — 31.32°N, 95.46°WCook Mountain — 32.87°N, 93.99°WByram — 32.01°N, 89.38°WByram — 32.18°N, 90.25°WByram — 32.48°N, 90.80°WByram — 32.32°N, 90.86°WByram — 32.41°N, 90.84°WByram — 32.35°N, 90.88°WLisbon — 31.53°N, 87.60°WLisbon — 31.84°N, 88.25°WLisbon — 31.50°N, 87.80°WLisbon — 31.76°N, 88.10°WLisbon — 31.87°N, 88.32°WLisbon — 31.70°N, 88.28°WLisbon — 31.32°N, 86.73°WLisbon — 31.30°N, 86.48°WLisbon — 31.54°N, 87.52°WKincaid — 31.28°N, 96.98°WKincaid — 30.80°N, 96.95°WKincaid — 31.17°N, 96.83°WKincaid — 30.08°N, 97.50°WKincaid — 31.67°N, 96.47°WKincaid — 30.33°N, 97.37°WKincaid — 30.85°N, 96.97°WKincaid — 29.27°N, 98.90°WKincaid — 32.43°N, 96.22°WKincaid — 31.12°N, 96.80°WKincaid — 32.98°N, 95.93°WKincaid — 33.13°N, 96.10°WKincaid — 32.58°N, 96.30°WKincaid — 29.21°N, 99.79°WKincaid — 28.71°N, 100.50°WKincaid — 30.23°N, 97.52°WKincaid — 30.11°N, 97.32°WKincaid — 30.00°N, 97.69°WKincaid — 29.89°N, 97.67°WKincaid — 28.74°N, 100.35°WKincaid — 29.39°N, 99.06°WKincaid — 29.39°N, 99.03°WKincaid — 29.33°N, 99.28°WKincaid — 29.16°N, 99.57°WKincaid — 29.33°N, 99.81°WKincaid — 28.44°N, 100.25°WKincaid — 31.31°N, 96.63°WKincaid — 31.22°N, 96.91°WEscondido — 29.59°N, 98.07°WEscondido — 29.30°N, 98.84°WEscondido — 29.34°N, 98.89°WEscondido — 29.29°N, 98.97°WEscondido — 29.39°N, 99.02°WEscondido — 29.36°N, 99.06°WEscondido — 29.27°N, 99.05°WEscondido — 29.34°N, 99.16°WEscondido — 29.24°N, 99.23°WEscondido — 29.32°N, 99.27°WEscondido — 29.25°N, 99.28°WEscondido — 29.18°N, 99.66°WEscondido — 29.10°N, 99.88°WEscondido — 29.09°N, 98.87°WEscondido — 29.08°N, 99.96°WEscondido — 29.06°N, 100.08°WEscondido — 29.05°N, 100.14°WEscondido — 29.03°N, 100.25°WEscondido — 28.87°N, 100.16°WEscondido — 28.96°N, 100.22°WEscondido — 28.92°N, 100.26°WEscondido — 28.76°N, 100.26°WEscondido — 28.72°N, 100.47°WEscondido — 28.66°N, 100.44°WEscondido — 28.53°N, 100.32°WEscondido — 28.26°N, 100.27°WGosport Sand — 31.52°N, 87.90°WGosport Sand — 31.54°N, 87.52°WGosport Sand — 31.50°N, 87.80°WGosport Sand — 31.57°N, 87.58°WGosport Sand — 31.53°N, 87.57°WGosport Sand — 31.13°N, 87.93°WBowden — 17.88°N, 76.28°WMoodys Branch — 32.85°N, 90.41°WMoodys Branch — 32.95°N, 90.17°WMoodys Branch — 32.23°N, 92.15°WMoodys Branch — 32.01°N, 92.00°WMoodys Branch — 32.33°N, 90.15°WMoodys Branch — 31.88°N, 88.69°WMoodys Branch — 31.88°N, 88.32°WMoodys Branch — 32.90°N, 90.19°WMoodys Branch — 31.54°N, 87.52°WMoodys Branch — 31.67°N, 92.89°WMoodys Branch — 35.01°N, 90.79°WMoodys Branch — 31.97°N, 88.53°WMoodys Branch — 32.17°N, 88.83°WMoodys Branch — 32.73°N, 90.46°WMoodys Branch — 31.26°N, 93.82°WGurabo — 19.48°N, 71.09°WGurabo — 19.53°N, 71.20°WGurabo — 19.58°N, 71.25°WGurabo — 19.48°N, 70.92°WGurabo — 19.92°N, 71.57°WGurabo — 19.48°N, 70.98°WGurabo — 19.45°N, 70.70°WGurabo — 18.73°N, 71.00°WGurabo — 19.30°N, 70.50°WGurabo — 19.53°N, 71.33°WGurabo — 19.40°N, 70.72°WGurabo — 19.30°N, 71.67°WGurabo — 19.58°N, 71.05°WChipola — 30.44°N, 85.19°WChipola — 30.57°N, 85.84°WChipola — 30.43°N, 84.98°WChipola — 30.59°N, 84.58°WChipola — 30.06°N, 84.49°WChipola — 30.47°N, 84.99°WTubará — 10.62°N, 75.45°WTubará — 10.96°N, 74.80°WTubará — 10.99°N, 74.95°WTubará — 10.80°N, 74.92°WTubará — 10.33°N, 75.41°WTubará — 10.45°N, 75.33°WTubará — 10.75°N, 74.98°WTubará — 10.40°N, 75.51°WPirabas — 0.80°S, 47.13°WPirabas — 1.00°S, 48.00°WPirabas — 1.23°S, 47.40°WPirabas — 0.48°S, 48.17°WPirabas — 1.05°S, 47.16°WPirabas — 0.68°S, 47.39°WPirabas — 0.60°S, 47.31°WPirabas — 2.58°S, 43.38°WPirabas — 2.88°S, 41.67°WPirabas — 3.09°S, 41.78°WJimol — 11.85°N, 71.33°WJimol — 11.94°N, 71.36°WJimol — 11.98°N, 71.31°WJimol — 11.96°N, 71.43°WPamlico — 38.69°N, 75.77°WPamlico — 38.55°N, 75.08°WPamlico — 32.08°N, 81.10°WPamlico — 32.78°N, 79.93°WPamlico — 32.69°N, 80.23°WPamlico — 34.04°N, 77.89°WPamlico — 34.78°N, 76.69°WPamlico — 35.00°N, 76.79°WPamlico — 35.25°N, 76.57°WPamlico — 35.14°N, 76.77°WPamlico — 35.64°N, 76.19°WPamlico — 35.70°N, 75.74°WPamlico — 35.50°N, 76.27°WPamlico — 32.64°N, 80.01°WPamlico — 36.33°N, 76.17°WPamlico — 32.87°N, 79.65°WPamlico — 33.56°N, 79.08°W

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The named rock units Arcida has been recovered from, largest first. Drawn where the rock is now, not where it formed. The read hit its cap, so each count is a floor. 1,101 further formations hold fewer occurrences each and are not listed. 2,697 occurrences have no formation on record, which is common for older literature.

Found in the same rock

1,354 taxa

The Paleobiology Database records at least 975 sites for Arcida, 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

at least 1,155 references

Each of the 12,000 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. That read hit its cap, so each count is a floor. 1,143 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 Arcida

Credit
Wilson44691
Licence
Public Domain
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC0 Public Domain
Commercial use
the licence allows it

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 itPteriomorphia through timeThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Stoliczka 1871