Goneplax rhomboides

Goneplax rhomboides is a species of crab. It is known by the common name angular crab because of its angular carapace. Although it is also called the square crab, its shell is in fact more trapezoidal than square. This species is also known as the mud-runner because they are able to run away quickly when threatened.

Goneplax rhomboides

Hans Hillewaert · 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
GoneplaxPBDB
Diet
carnivorePBDB, for Decapoda
Life habit
infaunalPBDB, for Goneplacidae
Motility
actively mobilePBDB, for Malacostraca
Vision
well-developedPBDB, for Malacostraca

Time the record covers

At least 5.4 million years on record.

The record covers at least 7.246 Mya to 1.8 Mya. No occurrence read is dated outside 11.63 Mya to 129 ka.

Miocene — about 2 of 11 occurrencesMiocenePliocene — about 4 of 11 occurrencesPliocenePleistocene — about 5 of 11 occurrencesPleistoceneHolocene — about 0 of 11 occurrences12–11 Mya — about 0.1 occurrences11–11 Mya — about 0.1 occurrences11–11 Mya — about 0.1 occurrences11–10 Mya — about 0.1 occurrences10–9.7 Mya — about 0.1 occurrences9.7–9.3 Mya — about 0.1 occurrences9.3–8.9 Mya — about 0.1 occurrences8.9–8.5 Mya — about 0.1 occurrences8.5–8.1 Mya — about 0.1 occurrences8.1–7.7 Mya — about 0.1 occurrences7.7–7.3 Mya — about 0.1 occurrences7.3–6.9 Mya — about 0.2 occurrences6.9–6.5 Mya — about 0.2 occurrences6.5–6.1 Mya — about 0.2 occurrences6.1–5.7 Mya — about 0.2 occurrences5.7–5.3 Mya — about 0.3 occurrences5.3–4.9 Mya — about 0.5 occurrences4.9–4.4 Mya — about 0.5 occurrences4.4–4.0 Mya — about 0.5 occurrences4.0–3.6 Mya — about 0.5 occurrences3.6–3.2 Mya — about 0.6 occurrences3.2–2.8 Mya — about 0.7 occurrences2.8–2.4 Mya — about 0.5 occurrences2.4–2.0 Mya — about 0.2 occurrences2.0–1.6 Mya — about 0.9 occurrences1.6–1.2 Mya — about 2 occurrences1.2–809 ka Mya — about 2 occurrences809 ka–404 ka Mya — about 0.2 occurrences404 ka–0 Mya — about 0.1 occurrences7.246 Mya1.8 Mya12.1 Mya0 Mya

11 occurrences of Goneplax rhomboides on record, most of them in the Pleistocene. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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

11 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

1 formation

Castell'Arquato — 44.86°N, 9.88°E

Loading coastlines…

The named rock units Goneplax rhomboides has been recovered from, largest first. Drawn where the rock is now, not where it formed. 10 occurrences have no formation on record, which is common for older literature.

Goneplax rhomboides and its relatives

Pleistocene

Where Goneplax rhomboides and its relatives were recorded in the Pleistocene.

Found in the same rock

83 taxa

The Paleobiology Database records 10 sites for Goneplax rhomboides, 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

6 references

Each of the 11 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 Goneplax rhomboides

Credit
Hans Hillewaert
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

No 3D scan of Goneplax rhomboides 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.

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 itGoneplax through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Linnaeus 1758)