Romaleon antennarium

Romaleon antennarium, commonly known as the Pacific, brown or California rock crab, is a crab of the genus Romaleon found on the western coast of North America.

Romaleon antennarium

NOAA · 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
Also called
Pacific rock crabPBDB
Sits inside
RomaleonPBDB
Diet
carnivorePBDB, for Decapoda
Life habit
semi-infaunalPBDB, for Cancridae
Motility
actively mobilePBDB, for Malacostraca
Vision
well-developedPBDB, for Malacostraca

Time the record covers

At least 3.4 million years on record.

The record covers at least 3.6 Mya to 129 ka. No occurrence read is dated outside 5.333 Mya to 11.7 ka.

Miocene — about 0 of 30 occurrencesPliocene — about 8 of 30 occurrencesPliocenePleistocene — about 22 of 30 occurrencesPleistoceneHolocene — about 0 of 30 occurrences5.4–5.3 Mya — about 0.1 occurrences5.3–5.1 Mya — about 0.2 occurrences5.1–4.9 Mya — about 0.2 occurrences4.9–4.7 Mya — about 0.2 occurrences4.7–4.5 Mya — about 0.2 occurrences4.5–4.3 Mya — about 0.2 occurrences4.3–4.1 Mya — about 0.2 occurrences4.1–3.9 Mya — about 0.2 occurrences3.9–3.7 Mya — about 0.2 occurrences3.7–3.5 Mya — about 0.7 occurrences3.5–3.3 Mya — about 1 occurrence3.3–3.1 Mya — about 1 occurrence3.1–2.9 Mya — about 1 occurrence2.9–2.7 Mya — about 1 occurrence2.7–2.5 Mya — about 0.9 occurrences2.5–2.3 Mya — about 0.1 occurrences2.3–2.1 Mya — about 0.1 occurrences2.1–1.9 Mya — about 0.1 occurrences1.9–1.8 Mya — about 0.1 occurrences1.8–1.6 Mya — about 0.1 occurrences1.6–1.4 Mya — about 0.1 occurrences1.4–1.2 Mya — about 0.1 occurrences1.2–972 ka Mya — about 0.1 occurrences972 ka–778 ka Mya — about 0.1 occurrences778 ka–583 ka Mya — about 0.7 occurrences583 ka–389 ka Mya — about 0.7 occurrences389 ka–194 ka Mya — about 0.7 occurrences194 ka–0 Mya — about 19 occurrences3.6 Mya129 ka5.8 Mya0 Mya

30 occurrences of Romaleon antennarium on record, most of them in the Pleistocene. 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

30 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

8 formations

Palos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.78°N, 118.30°WPalos Verdes Sand — 33.97°N, 118.42°WPalos Verdes Sand — 32.72°N, 117.26°WPalos Verdes Sand — 34.04°N, 118.57°WPalos Verdes Sand — 32.70°N, 117.19°WEtchegoin — 36.03°N, 120.05°WEtchegoin — 36.24°N, 120.36°WSan Joaquin — 36.03°N, 120.04°WSan Pedro — 33.74°N, 118.29°WSan Pedro — 33.75°N, 118.29°WSan Diego — 32.54°N, 117.11°WBay Point — 32.80°N, 117.26°WMillerton — 38.22°N, 122.95°WSan Diego — 32.47°N, 117.12°W

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The named rock units Romaleon antennarium has been recovered from, largest first. Drawn where the rock is now, not where it formed. 9 occurrences have no formation on record, which is common for older literature.

Romaleon antennarium and its relatives

Pleistocene

Where Romaleon antennarium and its relatives were recorded in the Pleistocene.

Found in the same rock

806 taxa

The Paleobiology Database records 29 sites for Romaleon antennarium, 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

2 references

Each of the 30 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 Romaleon antennarium

Credit
NOAA
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Romaleon antennarium 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 itRomaleon through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Stimpson 1856)