Entomaspis

Entomaspis is an extinct genus of harpetid trilobite from Upper Cambrian to Early Ordovician marine strata of the United States. Species are typified by their proportionally large, vaulted, croissant-shaped or bonnet-shaped cephalons that have the cheeks freed to become elongated, curved librigenial spines, and by their comparatively large, crescent-shaped eyes.

Entomaspis

Apokryltaros · CC BY-SA 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
EntomaspididaePBDB
Diet
carnivorePBDB, for Trilobita
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB
Environment
marinePBDB, for Trilobita

Time the record covers

At least 3.4 million years on record.

The record covers at least 486.85 Mya to 483.4 Mya. No occurrence read is dated outside 490.2 Mya to 481.7 Mya.

Cambrian — about 2 of 8 occurrencesCambrianOrdovician — about 6 of 8 occurrencesOrdovician490–490 Mya — about 0.1 occurrences490–490 Mya — about 0.2 occurrences490–489 Mya — about 0.2 occurrences489–489 Mya — about 0.2 occurrences489–489 Mya — about 0.2 occurrences489–488 Mya — about 0.2 occurrences488–488 Mya — about 0.2 occurrences488–488 Mya — about 0.2 occurrences488–488 Mya — about 0.2 occurrences488–487 Mya — about 0.2 occurrences487–487 Mya — about 0.2 occurrences487–487 Mya — about 0.0 occurrences483–483 Mya — about 1 occurrence483–483 Mya — about 1 occurrence483–482 Mya — about 1 occurrence482–482 Mya — about 1 occurrence482–482 Mya — about 1 occurrence482–482 Mya — about 0.5 occurrences486.85 Mya483.4 Mya490.7 Mya481.2 Mya

8 occurrences of Entomaspis 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

8 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

Garden City — 42.11°N, 111.64°WTrempealeau — 44.52°N, 89.57°WEminence — 37.93°N, 90.72°W

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

Entomaspis and its relatives

Ordovician

Where Entomaspis and its relatives were recorded in the Ordovician.

Found in the same rock

43 taxa

The Paleobiology Database records 8 sites for Entomaspis, 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 8 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 Entomaspis

Credit
Apokryltaros
Licence
CC BY-SA 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 itEntomaspididae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Ulrich 1931