Protobranchia
Protobranchia is a subclass of bivalve molluscs. It contains the extant orders Nuculanida, Nuculida, and Solemyida.

Tom Meijer · CC BY-SA 3.0 · 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
- BivalviaPBDB
- Diet
- suspension feederPBDB, for Bivalvia
- Life habit
- infaunalPBDB, for Bivalvia
- Motility
- facultatively mobilePBDB, for Bivalvia
- Vision
- blindPBDB, for Bivalvia
Time the record covers
At least 484 million years on record.
The record covers at least 484.3 Mya to 11.7 ka. No occurrence read is dated outside 486.85 Mya to 0 Mya.
12,000+ occurrences of Protobranchia 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- Ordovician6%
- Silurian2%
- Devonian13%
- Carboniferous5%
- Permian6%
- Early Triassicunder 1%
- Middle Triassic1%
- Late Triassic2%
- Early Jurassic2%
- Middle Jurassic5%
- Late Jurassic2%
- Early Cretaceous2%
- Late Cretaceous13%
- Paleocene6%
- Eocene10%
- Oligocene5%
- Miocene10%
- Pliocene4%
- Pleistocene3%
- 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. 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 1366 formations
- Moscow Formation · Hamilton Group385
- Chari Formation351
- Geneseo Formation · Genesee Group172
- Providence Formation165
- Corsicana Marl Formation165
- Moodys Branch Formation · Jackson Group141
Loading coastlines…
The named rock units Protobranchia 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. 1,342 further formations hold fewer occurrences each and are not listed. 1,684 occurrences have no formation on record, which is common for older literature.
Found in the same rock
1,982 taxa- Nuculana61 sites
- Nucula57 sites
- Crinoidea52 sites
- Nuculites43 sites
- Ctenodonta38 sites
- Gastropoda38 sites
- Lingula36 sites
- Pycnodonte vesicularis35 sites
- Modiolopsis34 sites
- Pterinea31 sites
- Orbiculoidea29 sites
- Modiolus27 sites
- Panopea27 sites
- Cyprimeria26 sites
- Granocardium26 sites
- Palaeoneilo26 sites
- Ambigostrea25 sites
- Dhondtichlamys25 sites
- Flexicalymene25 sites
- Hallopora25 sites
- Limopsis25 sites
- Aphrodina24 sites
- Isotelus24 sites
- Phestia24 sites
The Paleobiology Database records at least 933 sites for Protobranchia, 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
at least 1,119 references- Unpublished data from Kachchh385
- Unpublished data on Cretaceous-Paleocene molluscan assemblages315
- Neogene and Paleogene Molluscan (Bivalvia) Cenozones of the Russian Northeast.286
- Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Pteropoda, Scaphopoda and Cephalopoda245
- Neogene and Paleogene Molluscan (Bivalvia) Cenozones of Sakhalin and Kurile Islands218
- The Dynamics of Rapid, Asynchronous Biotic Turnover in the Middle Devonian Appalachian Basin of New York194
- Upper Cretaceous (Maestrichtian) larger invertebrate Fossils from the Haustator bilira Assemblage Zone in the west gulf Coastal Plain185
- Upper Cretaceous (Maestrichtian) Mollusca from the Haustator bilira Assemblage Zone in the East Gulf Coastal Plain185
- Molluscs at the K/Pg boundary in Argentina: Extinction and recovery patterns. unpublished Ph.D. thesis183
- Die Fauna des marinen Miozäns von Kevelaer (Niederrhein). Band 2 Bivalvia, Scaphopoda, Cephalopoda, Bryozoa, Annelida, Brachiopoda176
- Upper Cretaceous (Maestrichtian) larger invertebrates from the Haustator bilira Assemblage Zone in the Atlantic Coastal Plain with further data for the East Gulf171
- Work with Thayer collections, Yale Peabody Accession 7112, published, in part, "New perspectives on transitions between ecological-evolutionary subunits in the "type interval" for coordinated stasis", James J Zambito IV, Carlton E Brett, Gordon C Baird, Sarah E Kolbe, Arnold I Miller; Paleobiology144
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. 1,107 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 Protobranchia
- Source
- Wikipedia/Commons
- Credit
- Tom Meijer
- Licence
- CC BY-SA 3.0
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
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 itBivalvia through timeThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Pelseneer 1889)