Cancer productus
Cancer productus, one of several species known as red rock crabs, is a crab of the genus Cancer found on the western coast of North America. This species is commonly nicknamed the Pearl of the Pacific Northwest.

Taollan82 ; Kirt L. Onthank · 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- Also called
- red rock crabPBDB
- Sits inside
- CancerPBDB
- 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 0 Mya.
43 occurrences of Cancer productus 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
43 occurrences- Pliocene21%
- Pleistocene79%
- Holoceneunder 1%
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
14 formations
- San Pedro Formation10
- Palos Verdes Sand Formation4
- Timms Point Silt Formation3
- San Diego Formation3
- San Pedro Sand Formation2
- Santa Barbara Formation2
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The named rock units Cancer productus 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.
Cancer productus and its relatives
PleistoceneWhere Cancer productus and its relatives were recorded in the Pleistocene.
Found in the same rock
968 taxa- Romaleon jordani15 sites
- Metacarcinus gracilis14 sites
- Romaleon branneri14 sites
- Hirtoscala sawinae10 sites
- Hirtoscala tincta9 sites
- Nitidiscala indianorum8 sites
- Romaleon antennarium8 sites
- Cancer chaneyi7 sites
- Cancer (Metacarcinus) magister6 sites
- Opalia borealis6 sites
- Asperiscala bellastriata5 sites
- Asperiscala minuticosta5 sites
- Hiatella arctica5 sites
- Hirtoscala hindsii5 sites
- Mopalia acuta5 sites
- Myliobatis californica5 sites
- Nitidiscala californica5 sites
- Opalia spongiosa5 sites
- Seriphus politus5 sites
- Triakis semifasciata5 sites
- Antisabia panamensis4 sites
- Caesia fossatus4 sites
- Caesia perpinguis4 sites
- Callianax biplicata4 sites
The Paleobiology Database records 37 sites for Cancer productus, 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- The genus Cancer (Crustacea: Brachyura): systematics, biogeography and fossil record30
- The fossil stalk-eyed Crustacea of the Pacific slope of North America9
- Pleistocene Brachyura from the Los Angeles area: Cancridae2
- Late Pleistocene invertebrates of the Newport Bay area, California1
- An Upper Pleistocene fauna from the Baldwin Hills, Los Angeles County, California1
Each of the 43 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 content2
Picture of Cancer productus
- Source
- Wikipedia/Commons
- Credit
- Taollan82 ; Kirt L. Onthank
- Licence
- CC BY-SA 3.0
- Commercial use
- the licence allows it
3D model
- Source
- Sketchfab
- Credit
- tomprice3ddesign
- Licence
- CC Attribution
- Commercial use
- cannot be read from the licence given — check the record
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 itCancer through timeFormations of the PleistoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Randall 1839)