Murchisonia (Hormotoma) gracillima

Searched as Hormotoma gracillima. The Paleobiology Database treats Murchisonia (Hormotoma) gracillima as the accepted name.

Hormotoma gracillima (Murchison, 1859), a relative of Murchisonia (Hormotoma) gracillima — not Murchisonia (Hormotoma) gracillima itself

Not Murchisonia (Hormotoma) gracillima. This is Hormotoma gracillima (Murchison, 1859), a relative — both are Murchisoniidae.

via GBIF · CC BY-NC 4.0 · via GBIF. 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
HormotomaPBDB
Diet
herbivorePBDB, for Hormotoma
Life habit
epifaunalPBDB, for Hormotoma
Motility
actively mobilePBDB, for Hormotoma
Vision
limitedPBDB, for Murchisoniina
Environment
coastal,marinePBDB, for Murchisoniina

Time the record covers

At most 13 million years on record.

Every occurrence read is dated to somewhere between 483.4 Mya and 471.3 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Ordovician — about 4 of 4 occurrencesOrdovician483–483 Mya — about 0.0 occurrences483–483 Mya — about 0.1 occurrences483–482 Mya — about 0.1 occurrences482–482 Mya — about 0.1 occurrences482–481 Mya — about 0.1 occurrences481–481 Mya — about 0.2 occurrences481–480 Mya — about 0.2 occurrences480–480 Mya — about 0.2 occurrences480–480 Mya — about 0.2 occurrences480–479 Mya — about 0.2 occurrences479–479 Mya — about 0.2 occurrences479–478 Mya — about 0.2 occurrences478–478 Mya — about 0.2 occurrences478–477 Mya — about 0.2 occurrences477–477 Mya — about 0.2 occurrences477–476 Mya — about 0.1 occurrences476–476 Mya — about 0.1 occurrences476–476 Mya — about 0.1 occurrences476–475 Mya — about 0.1 occurrences475–475 Mya — about 0.1 occurrences475–474 Mya — about 0.1 occurrences474–474 Mya — about 0.1 occurrences474–473 Mya — about 0.1 occurrences473–473 Mya — about 0.1 occurrences473–473 Mya — about 0.1 occurrences473–472 Mya — about 0.1 occurrences472–472 Mya — about 0.1 occurrences472–471 Mya — about 0.1 occurrences483.9 Mya470.8 Mya

4 occurrences of Murchisonia (Hormotoma) gracillima 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

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

2 formations

Balnakeil — 58.25°N, 4.50°WBalnakeil — 58.58°N, 4.77°WCroisaphuill — 58.52°N, 4.80°WCroisaphuill — 58.60°N, 4.83°W

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The named rock units Murchisonia (Hormotoma) gracillima has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Murchisonia (Hormotoma) gracillima and its relatives

Ordovician

Where Murchisonia (Hormotoma) gracillima and its relatives were recorded in the Ordovician.

Found in the same rock

16 taxa

The Paleobiology Database records 3 sites for Murchisonia (Hormotoma) gracillima, 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

2 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 content1

Picture of Hormotoma gracillima (Murchison, 1859)

Source
GBIF
Credit
via GBIF
Licence
CC BY-NC 4.0
Commercial use
the licence does not allow it

No 3D scan of Murchisonia (Hormotoma) gracillima was found in Sketchfab.

Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itHormotoma through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Murchison 1859)