Pteromeris perplana
Pteromeris perplana, or the flat cardita, is a species of bivalve mollusc in the family Carditidae. It can be found along the Atlantic coast of North America, ranging from North Carolina to Florida.

via iDigBio · 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
- PteromerisPBDB
- Diet
- suspension feederPBDB, for Carditidae
- Life habit
- infaunalPBDB, for Carditidae
- Motility
- facultatively mobilePBDB, for Carditidae
- Vision
- blindPBDB, for Crassatelloidea
- Environment
- marinePBDB, for Crassatelloidea
Time the record covers
At least 15 million years on record.
The record covers at least 15.98 Mya to 129 ka. No occurrence read is dated outside 23.04 Mya to 11.7 ka.
29 occurrences of Pteromeris perplana on record, most of them in the Pleistocene. 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
29 occurrences- Miocene3%
- Pliocene41%
- Pleistocene55%
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
11 formations
- Waccamaw Formation8
- Duplin Formation6
- Yorktown Formation3
- Chowan RIver Formation2
- James City Formation2
- Caloosahatchee Formation1
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The named rock units Pteromeris perplana has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.
Pteromeris perplana and its relatives
PleistoceneWhere Pteromeris perplana and its relatives were recorded in the Pleistocene.
Found in the same rock
736 taxa- Crassinella lunulata17 sites
- Nucula (Nucula) proxima15 sites
- Parvilucina multistriata14 sites
- Abra aequalis13 sites
- Glycymeris americana13 sites
- Plicatula gibbosa13 sites
- Astarte concentrica11 sites
- Carolinapecten eboreus11 sites
- Timoclea grus10 sites
- Turritella10 sites
- Chione cribraria9 sites
- Moerella dupliniana9 sites
- Pleuromeris tridentata9 sites
- Semele bellastriata9 sites
- Bornia triangula8 sites
- Crassinella8 sites
- Diodora8 sites
- Olivella mutica8 sites
- Urosalpinx8 sites
- Anomia simplex7 sites
- Astyris lunata7 sites
- Crepidula fornicata7 sites
- Crepidula plana7 sites
- Donax7 sites
The Paleobiology Database records 20 sites for Pteromeris perplana, 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
9 references- Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions9
- Mollusca from the Miocene and Lower Pliocene of Virginia and North Carolina. Part 1. Pelecypoda9
- Late Pliocene and Early Pleistocene Mollusca from the James City and Chowan River Formations at Lee Creek Mine4
- The Pleistocene molluscan fauna from Leisley Shell Pit 1, Hillsborough County, Florida2
- Neogene Stratigraphy of the lower Coast Plain of the Carolinas1
- Neogene Biostratigraphy of the Charlotte Harbor Area in Southwestern Florida1
- Geology of the Western Everglades Area, Southern Florida1
- Geology of the Coastal Plain of South Carolina1
- Review of the evidence on which the human remains found at Vero, Florida, are referred to the Pleistocene1
Each of the 29 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. 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 Pteromeris perplana
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- not stated by the source
- Commercial use
- cannot be read from the licence given — check the record
CT scan
- Source
- MorphoSource
- Licence
- In Copyright
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Pteromeris perplana Conrad · fmnh:invertebrate zoology:208337
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 itPteromeris through timeFormations of the PleistoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Dall 1903)