Retzia
Searched as Retzia cf. schwageri baconica. The Paleobiology Database treats Retzia 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
- RetziidaePBDB
- Diet
- suspension feederPBDB, for Retziidina
- Life habit
- low-level epifaunalPBDB, for Retziidina
- Motility
- stationary, attachedPBDB, for Retziidina
- Vision
- blindPBDB, for Rhynchonellata
- Environment
- marinePBDB, for Lophophorata
Time the record covers
At most 10 million years on record.
The one occurrence read is dated to somewhere between 247 Mya and 237 Mya, which is a dating window rather than a span.
1 occurrence of Retzia on record, most of them in the Middle Triassic. 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 occurrences- Middle Triassic100%
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.
Retzia and its relatives
Middle TriassicWhere Retzia and its relatives were recorded in the Middle Triassic.
Found in the same rock
801 taxa- Rhynchonella8 sites
- Lima7 sites
- Diplospirella wissmanni6 sites
- Dentalium5 sites
- Anisactinella quadriplecta4 sites
- Aulacothyris4 sites
- Gastropoda4 sites
- Koeveskallina koeveskalyensis4 sites
- Lissatrypa4 sites
- Mentzelia mentzeli4 sites
- Mysidioptera4 sites
- Parallelodon4 sites
- Pecten4 sites
- Rhaetina pyriformis4 sites
- Spiriferina fortis4 sites
- Terquemia4 sites
- Thecospira tirolensis4 sites
- Tryplasma4 sites
- Amphiclina3 sites
- Arcestes3 sites
- Atreta3 sites
- Aviculopecten3 sites
- Bivalvia3 sites
- Cassianopsis armata3 sites
The Paleobiology Database records 38 sites for Retzia, 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
1 referenceEach of the 1 occurrence 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. Each entry links to the Paleobiology Database's own record for the work.
Media and terms
Media content1

Picture of Retzia
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Retzia was found in Sketchfab.
Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itRetziidae through timeFormations of the Middle TriassicThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. King 1850