Pachylasma

Pachylasma is a genus of symmetrical sessile barnacles in the family Pachylasmatidae. There are about eight described species in Pachylasma.

Pachylasma

Baptiste François · CC BY 4.0 · 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
PachylasmatinaePBDB
Diet
suspension feederPBDB, for Cirripedia
Life habit
epifaunalPBDB, for Cirripedia
Motility
stationary, attached, epibiontPBDB, for Cirripedia
Vision
limitedPBDB, for Cirripedia

Time the record covers

At least 50 million years on record.

The record covers at least 52 Mya to 1.8 Mya. No occurrence read is dated outside 56 Mya to 774 ka.

Paleocene — about 0 of 7 occurrencesEocene — about 4 of 7 occurrencesEoceneOligocene — about 0 of 7 occurrencesMiocene — about 2 of 7 occurrencesMiocenePliocene — about 0 of 7 occurrencesPleistocene — about 1 of 7 occurrences57–55 Mya — about 0.4 occurrences55–53 Mya — about 1.0 occurrences53–51 Mya — about 0.6 occurrences44–42 Mya — about 0.2 occurrences42–40 Mya — about 0.6 occurrences40–38 Mya — about 0.6 occurrences38–36 Mya — about 0.5 occurrences25–23 Mya — about 0.1 occurrences23–21 Mya — about 0.7 occurrences21–19 Mya — about 0.2 occurrences7.6–5.7 Mya — about 0.8 occurrences5.7–3.8 Mya — about 0.2 occurrences1.9–0 Mya — about 1 occurrence52 Mya1.8 Mya57 Mya0 Mya

7 occurrences of Pachylasma 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

7 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

3 formations

Red Bluff Tuff — 43.82°S, 176.50°WRed Bluff Tuff — 43.67°S, 176.53°WTe Whanga Limestone — 44.28°S, 176.77°EBrèches rouges de Carboneras — 37.60°N, 1.32°W

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The named rock units Pachylasma has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.

Pachylasma and its relatives

Eocene

Where Pachylasma and its relatives were recorded in the Eocene.

Found in the same rock

133 taxa

The Paleobiology Database records 5 sites for Pachylasma, 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

4 references

Each of the 7 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 content1

Picture of Pachylasma

Credit
Baptiste François
Licence
CC BY 4.0
Commercial use
the licence allows it

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 itPachylasmatinae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Darwin 1854