Trachycardium
Searched as Granocardium. The Paleobiology Database treats Trachycardium as the accepted name.

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
- TrachycardiinaePBDB
- Diet
- suspension feederPBDB
- Life habit
- infaunalPBDB
- Motility
- facultatively mobilePBDB
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At least 113 million years on record.
The record covers at least 113.2 Mya to 11.7 ka. No occurrence read is dated outside 121.4 Mya to 0 Mya.
1,130 occurrences of Trachycardium on record, most of them in the Late Cretaceous. 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
1,130 occurrences- Early Cretaceous4%
- Late Cretaceous57%
- Paleoceneunder 1%
- Eocene2%
- Oligocene2%
- Miocene18%
- Pliocene5%
- Pleistocene11%
- Holoceneunder 1%
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
176 formations
- Providence Formation126
- Escondido Formation60
- Corsicana Marl Formation39
- Gatun Formation38
- Kiowa Formation35
- Prairie Bluff Formation · Selma Group32
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The named rock units Trachycardium has been recovered from, largest first. Drawn where the rock is now, not where it formed. 152 further formations hold fewer occurrences each and are not listed. 178 occurrences have no formation on record, which is common for older literature.
Trachycardium and its relatives
Late CretaceousWhere Trachycardium and its relatives were recorded in the Late Cretaceous.
Found in the same rock
752 taxa- Cymbophora115 sites
- Anomia argentaria107 sites
- Striarca104 sites
- Syncyclonema93 sites
- Nuculana92 sites
- Cyprimeria90 sites
- Corbula85 sites
- Turritella84 sites
- Cubitostrea tecticosta81 sites
- Turritella trilira79 sites
- Crassatella vadosa78 sites
- Crenella serica76 sites
- Serpula74 sites
- Camptonectes bubonis73 sites
- Ostrea71 sites
- Granocardium70 sites
- Vertebrata70 sites
- Anomia ornata69 sites
- Bryozoa67 sites
- Turritella bilira67 sites
- Euspira rectilabrum64 sites
- Gabbigonia eufaulensis64 sites
- Veniella conradi64 sites
- Hamulus onyx62 sites
The Paleobiology Database records 489 sites for Trachycardium, 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
205 references- Upper Cretaceous (Maestrichtian) larger invertebrates from the Haustator bilira Assemblage Zone in the Atlantic Coastal Plain with further data for the East Gulf139
- Upper Cretaceous (Maestrichtian) larger invertebrate Fossils from the Haustator bilira Assemblage Zone in the west gulf Coastal Plain110
- Upper Cretaceous (Maestrichtian) Mollusca from the Haustator bilira Assemblage Zone in the East Gulf Coastal Plain104
- Unpublished data on Cretaceous-Paleocene molluscan assemblages88
- Paleoecology and Paleontology of the Lower Cretaceous Kiowa Formation, Kansas35
- Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (Pelecypods: Propeamussiidae to Cuspidariidae).28
- The Molluscan Fauna of the Alum Bluff Group of Florida28
- Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions26
- Neogene Paleontology in the Northern Dominican Republic 9. The Family Cardiidae (Mollusca: Bivalvia)25
- The larger invertebrate fossils of the Navarro group of Texas25
- Stratigraphy of the outcropping post-Magothy Upper Cretaceous formations in Southern New Jersey an Northern Delmarva peninsula, Delaware and Maryland24
- Taxonomy and palaeoecology of the Cenomanian-Turonian macroinvertebrates from eastern Sinai, Egypt (part A)13
Each of the 1,130 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. 193 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 Trachycardium
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itTrachycardiinae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Gabb 1869