Pliomera

Pliomera is a genus of trilobites that lived during the Middle Ordovician on the paleocontinent Baltica, now Norway, Sweden, Estonia and the Russian Federation, and in Argentina. It can be recognized for its pentagonal glabella widest between the frontal corners, with an inverted V-shaped occipital ring. In front of the occipital furrow that crosses the entire glabella, two pairs of dead-ending furrows create three side lobes left and right. The front of the glabella also has three dead-ending furrows, a very short one on the midline and left and right a longer one, directed inward and slightly backward. The eyes are small and are not connected to the glabella by an eye ridge. The thorax and pygidium are very regularly divided into up to 23 rather narrow segments, without a furrow within each of the pleurae. The pleurae are clearly wider than the axis. The pygidium ends in downward pointing toothlike spines.

Pliomera

Dwergenpaartje · 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
PliomeridaePBDB
Diet
carnivorePBDB, for Trilobita
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB, for Pliomeridae
Environment
marinePBDB, for Trilobita

Time the record covers

At least 21 million years on record.

The record covers at least 471.3 Mya to 449.5 Mya. No occurrence read is dated outside 477.1 Mya to 445.2 Mya.

Ordovician — about 47 of 47 occurrencesOrdovician478–477 Mya — about 0.5 occurrences477–476 Mya — about 1 occurrence476–474 Mya — about 1 occurrence474–473 Mya — about 1 occurrence473–472 Mya — about 1 occurrence472–471 Mya — about 1 occurrence471–470 Mya — about 2 occurrences470–469 Mya — about 3 occurrences469–468 Mya — about 6 occurrences468–467 Mya — about 6 occurrences467–466 Mya — about 6 occurrences466–464 Mya — about 6 occurrences464–463 Mya — about 2 occurrences463–462 Mya — about 1 occurrence462–461 Mya — about 1 occurrence461–460 Mya — about 0.9 occurrences460–459 Mya — about 0.9 occurrences459–458 Mya — about 0.7 occurrences458–457 Mya — about 0.5 occurrences457–456 Mya — about 0.5 occurrences456–455 Mya — about 0.5 occurrences455–453 Mya — about 0.3 occurrences453–452 Mya — about 0.4 occurrences452–451 Mya — about 0.7 occurrences451–450 Mya — about 0.7 occurrences450–449 Mya — about 2 occurrences449–448 Mya — about 0.6 occurrences448–447 Mya — about 0.6 occurrences447–446 Mya — about 0.6 occurrences446–445 Mya — about 0.2 occurrences471.3 Mya449.5 Mya477.7 Mya444.6 Mya

47 occurrences of Pliomera on record, most of them in the Ordovician. 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

47 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

16 formations

Holen — 57.23°N, 16.96°EHolen — 57.37°N, 17.08°EHolen — 57.32°N, 17.00°EHolen — 57.11°N, 16.89°EHolen — 57.03°N, 16.88°EHolen — 57.00°N, 16.82°EHolen — 57.17°N, 16.94°EHolen — 56.62°N, 16.56°ESuri — 29.00°S, 68.00°WSuri — 28.66°S, 68.84°WSuri — 28.67°S, 67.73°WVoskresenka — 51.17°N, 82.05°EVoskresenka — 51.62°N, 82.62°ESan Juan — 30.00°S, 69.00°WSan Juan — 29.76°S, 68.65°WSan Juan — 29.77°S, 68.63°WGulang — 37.00°N, 103.00°EGulang — 35.00°N, 105.00°EVolkhov — 59.97°N, 32.57°ELi-Lu — 22.49°N, 96.92°ELi-Lu — 22.59°N, 96.95°EKunlein — 21.89°N, 96.39°EKunlein — 22.06°N, 96.41°EElnes — 60.00°N, 11.00°ETonggao — 26.00°N, 108.00°EBeiguoshan — 35.00°N, 107.00°EOland C — 57.35°N, 17.04°ETozodov — 51.75°N, 87.28°EVexin — 58.46°N, 42.51°EObukhovskaya — 58.13°N, 32.27°EShihtien — 25.00°N, 99.06°E

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The named rock units Pliomera 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.

Pliomera and its relatives

Ordovician

Where Pliomera and its relatives were recorded in the Ordovician.

Found in the same rock

235 taxa

The Paleobiology Database records 46 sites for Pliomera, 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

16 references

Each of the 47 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. 4 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 content2

Picture of Pliomera

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

3D model

Source
Sketchfab
Licence
Free Standard
Commercial use
cannot be read from the licence given — check the record

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 itPliomeridae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Angelin 1845