Palaeozygopleuridae
Palaeozygopleuridae is an extinct taxonomic family of fossil sea snails, marine gastropod molluscs.

Not Palaeozygopleuridae. This is Loxonema hamiltoniae (Hall, 1859), a relative — both are Palaeozygopleuridae.
Yale Peabody Museum · CC0 · via GBIF. 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
- LoxonematoideaPBDB
- Diet
- suspension feederPBDB, for Loxonematoidea
- Life habit
- epifaunalPBDB, for Loxonematoidea
- Motility
- facultatively mobilePBDB, for Loxonematoidea
- Vision
- limitedPBDB, for Murchisoniina
- Environment
- coastal,marinePBDB, for Murchisoniina
Time the record covers
At least 158 million years on record.
The record covers at least 422.7 Mya to 264.28 Mya. No occurrence read is dated outside 443.1 Mya to 259.857 Mya.
269 occurrences of Palaeozygopleuridae on record, most of them in the Devonian. 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
269 occurrences- Silurian1%
- Devonian81%
- Carboniferous15%
- Permian2%
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
88 formations
- Skaneateles Formation · Hamilton Group24
- Moscow Formation · Hamilton Group17
- Praha Formation15
- Ludlowville Formation · Hamilton Group14
- Daleje-Trebotov Formation11
- Columbus Limestone Formation · Onondaga Group10
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The named rock units Palaeozygopleuridae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 64 further formations hold fewer occurrences each and are not listed. 10 occurrences have no formation on record, which is common for older literature.
Palaeozygopleuridae and its relatives
DevonianWhere Palaeozygopleuridae and its relatives were recorded in the Devonian.
Found in the same rock
2,499 taxa- Palaeozygopleura hamiltoniae49 sites
- Mucrospirifer mucronatus30 sites
- Nuculites oblongatus29 sites
- Tropidoleptus carinatus27 sites
- Devonochonetes scitulus25 sites
- Calvibembexia sulcomarginata24 sites
- Crinoidea24 sites
- Eldredgeops rana24 sites
- Nuculoidea23 sites
- Ambocoelia umbonata22 sites
- Lingula20 sites
- Nuculites20 sites
- Mediospirifer audaculus19 sites
- Palaeoneilo19 sites
- Palaeozygopleura delphicola18 sites
- Pleurodictyum18 sites
- Protoleptostrophia perplana18 sites
- Greenops boothi17 sites
- Longispina17 sites
- Pterochaenia17 sites
- Palaeozygopleura16 sites
- Retispira leda16 sites
- Sphenotus16 sites
- Athyris spiriferoides15 sites
The Paleobiology Database records 197 sites for Palaeozygopleuridae, 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
99 references- Quantitative Analysis of Paleocommunities in the Lower Part of the Hamilton Group near Cazenovia, New York18
- Review of palaeozygopleurid gastropods (Palaeozygopleuridae, Gastropoda) from Devonian strata of the Perunica microplate (Bohemia), with a re-evaluation of their stratigraphic distribution, notes on their ontogeny, and descriptions of new taxa15
- Relative taxonomic and ecological stability in Devonian marine faunas of New York State: a test of coordinated stasis11
- Palaeozygopleuridae nov. fam. (Gastropoda) ze stredoceskeho devonu10
- Stauffer, 190910
- Carboniferous Mollusca from the Tamworth Belt, New South Wales, Australia8
- A monograph of the Devonian fauna of the south of England. Volume I - Part III. The fauna of the limestones of Lummaton, Wolborough, Chircombe Bridge, and Chudleigh8
- Mitteldevonische (Givetische) Gastropoden (Mollusca) aus der Lahnmulde (suedliches Rheinisches Schiefergebirge)7
- Preliminary catalogue and report on the biostratigraphy and palaeogeographic distribution of the Bokkeveld fauna7
- Regional variation and paleontology of two coral beds in the Middle Devonian Hamilton Group of Western New York7
- Gastropoda from the Givetian “Massenkalk” of Schwelm and Hohenlimburg (Saureland, Rheinsiches Schiefergebirge, Germany)6
- The Dynamics of Rapid, Asynchronous Biotic Turnover in the Middle Devonian Appalachian Basin of New York6
Each of the 269 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. 87 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 Loxonema hamiltoniae (Hall, 1859)
- Source
- GBIF
- Credit
- Yale Peabody Museum
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Palaeozygopleuridae was found in MorphoSource and Sketchfab.
Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.
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 itLoxonematoidea through timeFormations of the DevonianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Horný 1955