Echinarachnius

Echinarachnius is a genus of sand dollars, belonging to the family Echinarachniidae.

Echinarachnius

USEPA Environmental-Protection-Agency · Public Domain · 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
EchinarachniidaePBDB
Diet
detritivorePBDB, for Clypeasteroida
Life habit
semi-infaunalPBDB, for Clypeasteroida
Motility
slow-movingPBDB, for Clypeasteroida
Vision
limitedPBDB, for Echinoidea
Environment
marinePBDB, for Echinodermata

Time the record covers

At least 23 million years on record.

The record covers at least 23.04 Mya to 11.7 ka. No occurrence read is dated outside 27.3 Mya to 0 Mya.

Oligocene — about 1 of 13 occurrencesOligoceneMiocene — about 7 of 13 occurrencesMiocenePliocene — about 3 of 13 occurrencesPliocenePleistocene — about 1 of 13 occurrencesPleistocene28–27 Mya — about 0.1 occurrences27–26 Mya — about 0.2 occurrences26–25 Mya — about 0.2 occurrences25–24 Mya — about 0.2 occurrences24–23 Mya — about 0.2 occurrences23–22 Mya — about 0.3 occurrences22–21 Mya — about 0.3 occurrences21–20 Mya — about 0.3 occurrences20–19 Mya — about 0.3 occurrences19–19 Mya — about 0.3 occurrences19–18 Mya — about 0.3 occurrences18–17 Mya — about 0.3 occurrences17–16 Mya — about 0.3 occurrences16–15 Mya — about 0.2 occurrences15–14 Mya — about 0.2 occurrences14–13 Mya — about 0.2 occurrences13–12 Mya — about 0.2 occurrences12–11 Mya — about 0.4 occurrences11–10 Mya — about 0.6 occurrences10–9.3 Mya — about 0.6 occurrences9.3–8.4 Mya — about 0.6 occurrences8.4–7.4 Mya — about 0.6 occurrences7.4–6.5 Mya — about 0.4 occurrences6.5–5.6 Mya — about 0.4 occurrences5.6–4.6 Mya — about 0.7 occurrences4.6–3.7 Mya — about 0.9 occurrences3.7–2.8 Mya — about 1 occurrence2.8–1.9 Mya — about 0.3 occurrences928 ka–0 Mya — about 2 occurrences23.04 Mya11.7 ka27.8 Mya0 Mya

13 occurrences of Echinarachnius on record, most of them in the Miocene. The Paleobiology Database records this as a living group. 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

13 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

7 formations

Unga — 56.01°N, 160.24°WTachilni — 54.93°N, 162.88°WTachilni — 54.85°N, 163.41°WKirkwood — 39.08°N, 74.82°WByoritsu — 24.55°N, 120.82°ETopsy — 58.65°N, 137.57°WYakataga — 58.40°N, 137.00°WSooke — 48.38°N, 123.87°W

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The named rock units Echinarachnius has been recovered from, largest first. Drawn where the rock is now, not where it formed. 4 occurrences have no formation on record, which is common for older literature.

Echinarachnius and its relatives

Miocene

Where Echinarachnius and its relatives were recorded in the Miocene.

Found in the same rock

61 taxa

The Paleobiology Database records 11 sites for Echinarachnius, 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

5 references

Each of the 13 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content1

Picture of Echinarachnius

Credit
USEPA Environmental-Protection-Agency
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Echinarachnius was found in Smithsonian Open Access and Sketchfab.

MorphoSource 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 itEchinarachniidae through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Gray 1825)