Spondylus
Spondylus is a genus of bivalve molluscs, the only genus in the family Spondylidae and subfamily Spondylinae. They are known in English as spiny oysters or thorny oysters.

Didier Descouens · CC BY-SA 4.0 · 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
- SpondylidaePBDB
- Diet
- suspension feederPBDB
- Life habit
- epifaunalPBDB
- Motility
- stationary, attachedPBDB
- Vision
- limitedPBDB, for Spondylidae
- Environment
- marinePBDB, for Pectinida
Time the record covers
At least 246 million years on record.
The record covers at least 247 Mya to 11.7 ka. No occurrence read is dated outside 250.8 Mya to 0 Mya.
931 occurrences of Spondylus 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
931 occurrences- Early Triassicunder 1%
- Late Triassicunder 1%
- Early Jurassicunder 1%
- Middle Jurassicunder 1%
- Late Jurassic1%
- Early Cretaceous3%
- Late Cretaceous25%
- Paleocene1%
- Eocene19%
- Oligocene5%
- Miocene23%
- Pliocene8%
- Pleistocene12%
- 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
246 formations
- Gurabo Formation32
- Prairie Bluff Formation · Selma Group27
- Vaqueros Formation16
- opoka Formation13
- Culebra Formation12
- Red Bluff Formation · Vicksburg Group11
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The named rock units Spondylus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 222 further formations hold fewer occurrences each and are not listed. 355 occurrences have no formation on record, which is common for older literature.
Spondylus and its relatives
Late CretaceousWhere Spondylus and its relatives were recorded in the Late Cretaceous.
Found in the same rock
3,322 taxa- Pycnodonte vesicularis53 sites
- Turritella52 sites
- Chlamys38 sites
- Nuculana38 sites
- Exogyra (Exogyra) costata37 sites
- Lyriochlamys35 sites
- Panopea33 sites
- Modiolus32 sites
- Ostrea32 sites
- Crassatella31 sites
- Granocardium31 sites
- Pycnodonte31 sites
- Crassatella vadosa29 sites
- Idonearca capax29 sites
- Bryozoa28 sites
- Crenella serica28 sites
- Nucula28 sites
- Pseudolimea28 sites
- Anomia argentaria27 sites
- Cardium27 sites
- Cucullaea27 sites
- Barbatia26 sites
- Dhondtichlamys26 sites
- Gryphaeostrea vomer26 sites
The Paleobiology Database records 601 sites for Spondylus, 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
317 references- Unpublished data on Cretaceous-Paleocene molluscan assemblages85
- Neogene Paleontology in the northern Dominican Republic: The Genus Spondylus (Bivalvia: Spondylidae)39
- Karagyuleva, 196430
- Upper Cretaceous (Maestrichtian) Mollusca from the Haustator bilira Assemblage Zone in the East Gulf Coastal Plain26
- Maastrichtian non-cephalopod mollusks: Scaphopoda, Gastropoda and Bivalvia of the Middle Vistula Valley, central Poland17
- Biozonation of the Neogene invertebrate megafauna of the Hellenic area15
- Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (Pelecypods: Propeamussiidae to Cuspidariidae).14
- Cretaceous-Cenozoic geology and biostratigraphy of the Chatham Islands, New Zealand12
- Lower Oligocene Bivalvia of the Vicksburg Group in Mississippi12
- Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Pteropoda, Scaphopoda and Cephalopoda12
- Five shallow benthic mollusc faunas from the Upper Eocene (Baron, Priabona, Garoowe, Nanggulan, Takashima)11
- The Vaqueros Formation, Lower Miocene of California. I. Paleontology11
Each of the 931 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. 305 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 content4
Picture of Spondylus
- Source
- Wikipedia/Commons
- Credit
- Didier Descouens
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
3D scan
- Source
- Smithsonian
- Licence
- CC0 — this site’s default, not the record’s
- Commercial use
- the licence allows it
- Specimen
- Spondylus regius
CT scan
- Source
- MorphoSource
- Licence
- In Copyright
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Spondylus tenuis · FMNH:Invertebrate Zoology:177525
3D model
- Source
- Sketchfab
- Licence
- CC Attribution-NonCommercial
- Commercial use
- the licence does not allow it
The description on this site
- Source
- Wikipedia, “Spondylus”
- 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 itSpondylidae through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Linnaeus 1758