Trimerus

Searched as Trimerus (Dipleura) dekayi boliviensis. The Paleobiology Database treats Trimerus as the accepted name.

Trimerus is an extinct genus of trilobite in the family Homalonotidae. Trimerus is one of North America's largest trilobites, reaching over 20 cm (7.9 in) in length. It had a thorax composed of 13 segments with weak trilobation, a large subtriangular head terminating in an expanded rostral plate, a two-pronged hypostome, and a triangular pygidium. It is known from all continents except for Antarctica. Its tiny compound eyes and the shovel-like anterior of the head suggests a burrowing lifestyle, and an exoskeleton marked with many small pores which, in life, probably housed hair-like sensory setae in life, allowed the trilobite to feel which portions of its body were covered with sediment.

Trimerus

the paleobear from Lontananza, Loreto, Peru · CC BY 2.0 · 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
HomalonotinaePBDB
Diet
carnivorePBDB, for Trilobita
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB, for Homalonotidae
Environment
marinePBDB, for Trilobita

Time the record covers

At most 5.6 million years on record.

The one occurrence read is dated to somewhere between 393.47 Mya and 387.95 Mya, which is a dating window rather than a span.

Devonian — about 1 of 1 occurrenceDevonian394–393 Mya — about 0.0 occurrences393–393 Mya — about 0.0 occurrences393–393 Mya — about 0.0 occurrences393–393 Mya — about 0.0 occurrences393–392 Mya — about 0.0 occurrences392–392 Mya — about 0.0 occurrences392–392 Mya — about 0.0 occurrences392–392 Mya — about 0.0 occurrences392–392 Mya — about 0.0 occurrences392–391 Mya — about 0.0 occurrences391–391 Mya — about 0.0 occurrences391–391 Mya — about 0.0 occurrences391–391 Mya — about 0.0 occurrences391–390 Mya — about 0.0 occurrences390–390 Mya — about 0.0 occurrences390–390 Mya — about 0.0 occurrences390–390 Mya — about 0.0 occurrences390–390 Mya — about 0.0 occurrences390–389 Mya — about 0.0 occurrences389–389 Mya — about 0.0 occurrences389–389 Mya — about 0.0 occurrences389–389 Mya — about 0.0 occurrences389–389 Mya — about 0.0 occurrences389–388 Mya — about 0.0 occurrences388–388 Mya — about 0.0 occurrences388–388 Mya — about 0.0 occurrences394 Mya387.4 Mya

1 occurrence of Trimerus on record, most of them in the Devonian. 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

1 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

1 formation

Sica Sica — 15.50°S, 68.00°W

Loading coastlines…

The named rock units Trimerus has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Trimerus and its relatives

Devonian

Where Trimerus and its relatives were recorded in the Devonian.

Found in the same rock

629 taxa

The Paleobiology Database records 69 sites for Trimerus, 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

1 reference

Each of the 1 occurrence 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content2

Picture of Trimerus

Credit
the paleobear from Lontananza, Loreto, Peru
Licence
CC BY 2.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial
Commercial use
the licence does not allow it

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 itHomalonotinae through timeFormations of the DevonianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Green 1832