Geragnostus

Searched as Geragnostus splendens. The Paleobiology Database treats Geragnostus as the accepted name.

Geragnostus is a genus of very small agnostid trilobites whose fossils are found Ordovician-aged marine strata from Eurasia, North America and Argentina.

Geragnostus

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
MetagnostidaePBDB
Diet
detritivorePBDB, for Agnostida
Life habit
epifaunalPBDB, for Agnostida
Motility
slow-movingPBDB, for Agnostida
Vision
blindPBDB, for Metagnostidae

Time the record covers

At most 7.7 million years on record.

Every occurrence read is dated to somewhere between 477.1 Mya and 469.4 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Ordovician — about 6 of 6 occurrencesOrdovician477–477 Mya — about 0.0 occurrences477–477 Mya — about 0.0 occurrences477–476 Mya — about 0.0 occurrences476–476 Mya — about 0.0 occurrences476–476 Mya — about 0.0 occurrences476–476 Mya — about 0.1 occurrences476–475 Mya — about 0.2 occurrences475–475 Mya — about 0.2 occurrences475–475 Mya — about 0.5 occurrences475–474 Mya — about 0.6 occurrences474–474 Mya — about 0.6 occurrences474–474 Mya — about 0.6 occurrences474–474 Mya — about 0.6 occurrences474–473 Mya — about 0.6 occurrences473–473 Mya — about 0.4 occurrences473–473 Mya — about 0.2 occurrences473–472 Mya — about 0.2 occurrences472–472 Mya — about 0.2 occurrences472–472 Mya — about 0.2 occurrences472–472 Mya — about 0.2 occurrences472–471 Mya — about 0.2 occurrences471–471 Mya — about 0.0 occurrences471–471 Mya — about 0.0 occurrences471–470 Mya — about 0.0 occurrences470–470 Mya — about 0.0 occurrences470–470 Mya — about 0.0 occurrences470–469 Mya — about 0.0 occurrences469–469 Mya — about 0.0 occurrences477.6 Mya468.9 Mya

6 occurrences of Geragnostus 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

6 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

4 formations

Leetse — 59.75°N, 30.43°ELeetse — 59.88°N, 31.59°EGap Creek — 18.63°S, 125.92°EKlabava — 50.00°N, 14.00°ELeetse — 59.40°N, 24.61°E

Loading coastlines…

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

Geragnostus and its relatives

Ordovician

Where Geragnostus and its relatives were recorded in the Ordovician.

Found in the same rock

1,224 taxa

The Paleobiology Database records 235 sites for Geragnostus, 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

3 references

Each of the 6 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 Geragnostus

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

No 3D scan of Geragnostus was found in MorphoSource and Sketchfab.

Smithsonian Open Access was 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 itMetagnostidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Howell 1935