Riedelia

Williamriedelia is a genus of diatoms known from the fossil record, comprising approximately three species. Many of the species were originally described under the closely allied genus Hemiaulus. Paleontologists Hans-Joachim Schrader and Juliane Fenner, working with fossil specimens obtained from Leg 38 of the Deep Sea Drilling Program in the Norwegian and Greenland Seas, decided that several previous descriptions of diatoms belonging to Hemiaulus were rightfully placed on Williamriedelia. Schrader and Fenner note that while Hemiaulus diatoms have polygonal areolated valves, Williamriedelia valves are punctate with isolated punctae. Additionally, Williamriedelia typically have two spines, while Hemiaulus have only one. These characteristics were used to justify the placement of these species in Williamriedelia.

No picture of Riedelia was found. Wikipedia and iDigBio were searched and had none. Wikidata has a picture filed under this name, but nothing tied it to Riedelia itself, so it was not used. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Riedelia, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
HemiaulaceaePBDB
Diet
"photoautotroph"PBDB, for Bacillariophyceae
Environment
marine,brackish,freshwaterPBDB, for Bacillariophyceae

Time the record covers

At least 17 million years on record.

The record covers at least 41.03 Mya to 23.04 Mya. No occurrence read is dated outside 48.07 Mya to 5.333 Mya.

Eocene — about 1 of 2 occurrencesEoceneOligocene — about 0 of 2 occurrencesMiocene — about 1 of 2 occurrencesMiocenePliocene — about 0 of 2 occurrences49–47 Mya — about 0.1 occurrences47–46 Mya — about 0.2 occurrences46–44 Mya — about 0.2 occurrences44–43 Mya — about 0.2 occurrences43–42 Mya — about 0.2 occurrences42–40 Mya — about 0.1 occurrences24–22 Mya — about 0.0 occurrences22–21 Mya — about 0.1 occurrences21–19 Mya — about 0.1 occurrences19–18 Mya — about 0.1 occurrences18–16 Mya — about 0.1 occurrences16–15 Mya — about 0.1 occurrences15–13 Mya — about 0.1 occurrences13–12 Mya — about 0.1 occurrences12–10 Mya — about 0.1 occurrences10–8.9 Mya — about 0.1 occurrences8.9–7.4 Mya — about 0.1 occurrences7.4–6.0 Mya — about 0.1 occurrences6.0–4.5 Mya — about 0.0 occurrences41.03 Mya23.04 Mya48.9 Mya4.5 Mya

2 occurrences of Riedelia on record, most of them in the Eocene. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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

2 occurrences

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

2 formations

Kylan — 59.92°N, 164.78°ENeyveli — 11.54°N, 79.48°E

Loading coastlines…

The named rock units Riedelia has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Riedelia and its relatives

Eocene

Where Riedelia and its relatives were recorded in the Eocene.

Found in the same rock

186 taxa

The Paleobiology Database records 2 sites for Riedelia, 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

2 references

Each of the 2 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. 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 content0

No picture of Riedelia was found. Wikipedia and iDigBio were searched and had none.

Wikidata has a picture filed under this name, but nothing tied it to Riedelia itself, so it was not used.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Riedelia, or no answer at all. This entry cannot say which.

No 3D scan of Riedelia 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.

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 itHemiaulaceae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Jousé and Sheshukova-Poretzkaya 1971