Akera

Akera is a marine genus of sea hare in the family Akeridae, known from the late Callovian (Jurassic) to the recent periods.

Akera

Francisco Welter Schultes · Public Domain · 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
AkeridaePBDB
Life habit
epifaunalPBDB, for Gastropoda
Motility
actively mobilePBDB, for Gastropoda
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 165 million years on record.

The record covers at least 165.3 Mya to 129 ka. No occurrence read is dated outside 170.9 Mya to 11.7 ka.

Middle Jurassic — about 3 of 31 occurrencesLate Jurassic — about 0 of 31 occurrencesEarly Cretaceous — about 1 of 31 occurrencesEarly CretaceousLate Cretaceous — about 4 of 31 occurrencesLate CretaceousPaleocene — about 1 of 31 occurrencesEocene — about 18 of 31 occurrencesEoceneOligocene — about 2 of 31 occurrencesMiocene — about 1 of 31 occurrencesMiocenePliocene — about 0 of 31 occurrencesPleistocene — about 1 of 31 occurrences174–169 Mya — about 0.4 occurrences169–163 Mya — about 2 occurrences163–157 Mya — about 0.6 occurrences110–105 Mya — about 0.3 occurrences105–99 Mya — about 1 occurrence99–93 Mya — about 2 occurrences93–87 Mya — about 0.8 occurrences87–81 Mya — about 0.2 occurrences81–76 Mya — about 0.5 occurrences76–70 Mya — about 0.3 occurrences70–64 Mya — about 0.5 occurrences64–58 Mya — about 0.5 occurrences58–52 Mya — about 4 occurrences52–46 Mya — about 5 occurrences46–41 Mya — about 4 occurrences41–35 Mya — about 5 occurrences35–29 Mya — about 2 occurrences29–23 Mya — about 0.5 occurrences23–17 Mya — about 1 occurrence5.8–0 Mya — about 1 occurrence165.3 Mya129 ka174 Mya0 Mya

31 occurrences of Akera on record, most of them in the Eocene. 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

31 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

15 formations

Shekhan — 33.58°N, 71.83°EShekhan — 33.60°N, 71.90°EDhruma — 24.23°N, 46.58°ELlajas — 34.31°N, 118.67°WWeches — 30.00°N, 97.15°WWeches — 31.56°N, 94.50°WGalala — 30.38°N, 33.52°EGalala — 29.63°N, 34.40°ENacatoch Sand — 32.10°N, 96.47°WCalcaire de Vigny — 49.07°N, 1.92°ETamala Limestone — 32.00°S, 115.81°EFalun de Saucats — 44.66°N, 0.57°WNari — 26.36°N, 67.86°ENanggulan — 7.73°S, 110.18°ECapusu — 46.68°N, 23.45°ECotinguiba — 10.86°S, 37.15°WAvenal — 35.88°N, 120.10°WDrug — 29.95°N, 70.12°E

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The named rock units Akera has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 occurrences have no formation on record, which is common for older literature.

Akera and its relatives

Eocene

Where Akera and its relatives were recorded in the Eocene.

Found in the same rock

494 taxa

The Paleobiology Database records 25 sites for Akera, 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

21 references

Each of the 31 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. 9 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 Akera

Credit
Francisco Welter Schultes
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Akera 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 itAkeridae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Muller 1776)