Anabarella

Anabarella is a species of bilaterally-flattened monoplacophoran mollusc, with a morphological similarity to the rostroconchs. Its shell preserves evidence of three mineralogical textures on its outer surface: it is polygonal near the crest of the shell, subsequently changing to both spiny and stepwise. Its internal microstructure is calcitic and semi-nacreous. Its name reflects its provenance from Anabar, Siberia. It has been interpreted as ancestral to the rostroconchs, and has been aligned to the Helcionellidae.

No picture of Anabarella was found. Wikipedia, Wikidata, iDigBio and Smithsonian Open Access were searched and had none. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Anabarella, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
HelcionellidaePBDB
Diet
detritivorePBDB, for Helcionellidae
Life habit
low-level epifaunalPBDB, for Helcionellidae
Motility
slow-movingPBDB, for Helcionellidae
Vision
limitedPBDB, for Helcionelloida
Environment
marinePBDB, for Helcionelloida

Time the record covers

At least 14 million years on record.

The record covers at least 525.5 Mya to 511.2 Mya. No occurrence read is dated outside 538.8 Mya to 506.5 Mya.

Cambrian — about 103 of 103 occurrencesCambrian539–538 Mya — about 0.2 occurrences538–537 Mya — about 0.5 occurrences537–536 Mya — about 0.5 occurrences536–535 Mya — about 0.5 occurrences535–534 Mya — about 0.5 occurrences534–533 Mya — about 0.5 occurrences533–532 Mya — about 0.5 occurrences532–530 Mya — about 0.5 occurrences530–529 Mya — about 0.6 occurrences529–528 Mya — about 0.6 occurrences528–527 Mya — about 0.6 occurrences527–526 Mya — about 0.6 occurrences526–525 Mya — about 3 occurrences525–524 Mya — about 6 occurrences524–523 Mya — about 6 occurrences523–522 Mya — about 6 occurrences522–520 Mya — about 6 occurrences520–519 Mya — about 7 occurrences519–518 Mya — about 7 occurrences518–517 Mya — about 7 occurrences517–516 Mya — about 7 occurrences516–515 Mya — about 13 occurrences515–514 Mya — about 11 occurrences514–513 Mya — about 10 occurrences513–511 Mya — about 5 occurrences511–510 Mya — about 1 occurrence510–509 Mya — about 1 occurrence509–508 Mya — about 0.6 occurrences508–507 Mya — about 0.2 occurrences507–506 Mya — about 0.1 occurrences525.5 Mya511.2 Mya539.4 Mya505.9 Mya

103 occurrences of Anabarella on record, most of them in the Cambrian. 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

103 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

30 formations

Parara — 34.73°S, 137.63°EParara — 34.70°S, 137.71°EParara — 34.80°S, 137.69°EParara Limestone — 34.92°S, 137.80°EAjax Limestone — 30.59°S, 138.33°EWilkawillina Limestone — 30.72°S, 139.20°EWilkawillina Limestone — 31.85°S, 140.63°EWirrapowie Limestone — 30.72°S, 139.20°EPestrotsvet — 57.67°N, 131.83°EPestrotsvet — 71.83°N, 107.00°EPestrotsvet — 71.50°N, 105.00°EPestrotsvet — 57.40°N, 132.73°EMedvezhyn — 71.00°N, 102.00°EMedvezhyn — 70.64°N, 103.43°EMedvezhyn — 71.50°N, 102.50°EMedvezhya — 71.33°N, 99.50°EMedvezhya — 70.14°N, 114.00°EBastion — 74.10°N, 23.00°WBastion — 74.35°N, 22.77°WMernmerna — 30.81°S, 140.69°EMernmerna — 31.55°S, 140.79°EMernmerna Formation — 30.72°S, 139.18°EMernmerna Formation — 31.85°S, 140.63°EMernmerna Formation — 31.01°S, 139.24°EPestrotsvetnaya — 58.75°N, 130.62°EBystraya — 52.00°N, 119.00°EChapel Island — 47.00°N, 56.00°WChapel Island — 47.07°N, 55.87°WKulpara — 34.92°S, 137.80°EShackleton Limestone — 82.22°S, 160.33°EMedvezhin — 70.67°N, 103.00°EEmyaksin — 70.72°N, 112.76°EXidashan — 41.50°N, 90.00°EZwetau — 51.17°N, 15.00°ECape Melville — 62.03°S, 57.60°WCoonigan — 31.31°S, 142.18°EUpper Alcudian — 38.47°N, 3.83°WLemdad — 30.80°N, 8.20°W

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The named rock units Anabarella has been recovered from, largest first. Drawn where the rock is now, not where it formed. 6 further formations hold fewer occurrences each and are not listed. 4 occurrences have no formation on record, which is common for older literature.

Anabarella and its relatives

Cambrian

Where Anabarella and its relatives were recorded in the Cambrian.

Found in the same rock

457 taxa

The Paleobiology Database records 92 sites for Anabarella, 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

26 references

Each of the 103 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. 14 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 content0

No picture of Anabarella was found. Wikipedia, Wikidata, iDigBio and Smithsonian Open Access were searched and had none.

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

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 itHelcionellidae through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Vostokova 1962