Atrina seminuda

Atrina seminuda, the half-naked pen shell, is a species of bivalve mollusc in the family Pinnidae.

Atrina seminuda

Veronidae · CC BY-SA 3.0 · 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
AtrinaPBDB
Diet
suspension feederPBDB, for Atrina
Life habit
semi-infaunalPBDB, for Atrina
Motility
stationary, attachedPBDB, for Atrina
Vision
blindPBDB, for Bivalvia
Environment
marine,brackishPBDB, for Ostreida

Time the record covers

At least 3.4 million years on record.

The record covers at least 3.6 Mya to 129 ka. No occurrence read is dated outside 5.333 Mya to 11.7 ka.

Miocene — about 0 of 4 occurrencesPliocene — about 1 of 4 occurrencesPliocenePleistocene — about 3 of 4 occurrencesPleistoceneHolocene — about 0 of 4 occurrences5.4–5.3 Mya — about 0.0 occurrences5.3–5.1 Mya — about 0.1 occurrences5.1–4.9 Mya — about 0.1 occurrences4.9–4.7 Mya — about 0.1 occurrences4.7–4.5 Mya — about 0.1 occurrences4.5–4.3 Mya — about 0.1 occurrences4.3–4.1 Mya — about 0.1 occurrences4.1–3.9 Mya — about 0.1 occurrences3.9–3.7 Mya — about 0.1 occurrences3.7–3.5 Mya — about 0.1 occurrences2.7–2.5 Mya — about 0.0 occurrences2.5–2.3 Mya — about 0.1 occurrences2.3–2.1 Mya — about 0.1 occurrences2.1–1.9 Mya — about 0.1 occurrences1.9–1.8 Mya — about 0.1 occurrences1.8–1.6 Mya — about 0.1 occurrences1.6–1.4 Mya — about 0.1 occurrences1.4–1.2 Mya — about 0.1 occurrences1.2–972 ka Mya — about 0.1 occurrences972 ka–778 ka Mya — about 0.1 occurrences778 ka–583 ka Mya — about 0.1 occurrences583 ka–389 ka Mya — about 0.1 occurrences389 ka–194 ka Mya — about 0.1 occurrences194 ka–0 Mya — about 2 occurrences3.6 Mya129 ka5.8 Mya0 Mya

4 occurrences of Atrina seminuda on record, most of them in the Pleistocene. 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

4 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

Playa Grande — 10.00°N, 63.00°WPamlico — 33.38°N, 79.22°WChuy — 33.88°S, 53.52°W

Loading coastlines…

The named rock units Atrina seminuda has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Atrina seminuda and its relatives

Pleistocene

Where Atrina seminuda and its relatives were recorded in the Pleistocene.

Found in the same rock

19 taxa

The Paleobiology Database records 2 sites for Atrina seminuda, and this reads all of them. The number is how many of those sites it was catalogued from too.

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 4 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 content2

Picture of Atrina seminuda

Credit
Veronidae
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Atrina (Servatrina) seminuda · FMNH:Invertebrate Zoology:151482

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 itAtrina through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Lamarck 1819)