Isotelus harrisi

via iDigBio · CC0 · via iDigBio. 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
- IsotelusPBDB
- Diet
- carnivorePBDB, for Trilobita
- Life habit
- low-level epifaunalPBDB, for Asaphida
- Motility
- fast-movingPBDB, for Asaphida
- Vision
- well-developedPBDB, for Asaphidae
- Environment
- marinePBDB, for Trilobita
Time the record covers
At most 14 million years on record.
Every occurrence read is dated to somewhere between 471.3 Mya and 457.3 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.
72 occurrences of Isotelus harrisi 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
72 occurrences- Ordovician100%
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
5 formations
- Valcour Formation · Chazy Group23
- Crown Point Formation · Chazy Group17
- Day Point Formation · Chazy Group15
- Mingan Formation12
- Sunblood Formation4
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The named rock units Isotelus harrisi 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.
Isotelus harrisi and its relatives
OrdovicianWhere Isotelus harrisi and its relatives were recorded in the Ordovician.
Found in the same rock
173 taxa- Leperditia canadensis28 sites
- Stenopareia globosus27 sites
- Pliomerops canadensis23 sites
- Multicostella platys22 sites
- Mimella vulgaris21 sites
- Calyptaulax annulata19 sites
- Thaleops ovata19 sites
- Bucania sulcatina18 sites
- Eurychilina latimarginata16 sites
- Onychoplecia longirostris16 sites
- Rafinesquina alternata16 sites
- Rostricellula plena16 sites
- Macrocoelia champlainensis15 sites
- Raphistoma stamineum15 sites
- Hibbertia valcourensis14 sites
- Amphilichas minganensis13 sites
- Maclurites magnus13 sites
- Dactylogonia incrassata12 sites
- Lonchodomas chaziensis12 sites
- Phylloporina incepta12 sites
- Camerella ventricosa11 sites
- Sphaerexochus parvus11 sites
- Ceraurinella pompilia10 sites
- Stictopora fenestrata10 sites
The Paleobiology Database records 72 sites for Isotelus harrisi, 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- The Chazy Formation and its fauna47
- Ordovician trilobites from the Romaine and Mingan Formations (Ibexian-Late Whiterockian), Mingan Islands, Quebec12
- Early Middle Ordovician (Chazy) trilobites of New York9
- Middle Ordovician (Whiterockian) trilobites from the Sunblood Formation, District of Mackenzie, Canada4
Each of the 72 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 Isotelus harrisi
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itIsotelus through timeFormations of the OrdovicianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Raymond 1905