Mopalia muscosa
Mopalia muscosa, the mossy chiton, is a species of chiton, a polyplacophoran, an eight-plated marine mollusk. It is a northeastern Pacific species which occurs from British Columbia, Canada, to Baja California Mexico.

Uncredited · 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
- mossy mopaliaPBDB
- Sits inside
- MopaliaPBDB
- Diet
- grazerPBDB, for Polyplacophora
- Life habit
- epifaunalPBDB, for Polyplacophora
- Motility
- facultatively mobile, attachedPBDB, for Polyplacophora
- Vision
- limitedPBDB, for Polyplacophora
- Environment
- marine,brackishPBDB, for Polyplacophora
Time the record covers
At least 117 thousand years on record.
The record covers at least 129 ka to 11.7 ka. No occurrence read is dated outside 2.58 Mya to 0 Mya.
31 occurrences of Mopalia muscosa on record, most of them in the Pleistocene. 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
31 occurrences- Pleistocene97%
- Holocene3%
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
5 formations
- Unnamed Formation9
- Palos Verdes Sand Formation2
- Quaternary terrace Formation1
- San Pedro Sand Formation1
- Palos Verdes Formation1
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The named rock units Mopalia muscosa has been recovered from, largest first. Drawn where the rock is now, not where it formed. 17 occurrences have no formation on record, which is common for older literature.
Mopalia muscosa and its relatives
PleistoceneWhere Mopalia muscosa and its relatives were recorded in the Pleistocene.
Found in the same rock
804 taxa- Callianax biplicata20 sites
- Epilucina californica20 sites
- Diodora aspera19 sites
- Littorina (Littorina) scutulata19 sites
- Lottia scabra18 sites
- Thylacodes squamigerus18 sites
- Chlorostoma funebrale17 sites
- Glans carpenteri17 sites
- Homalopoma (Homalopoma) luridum17 sites
- Lacuna (Epheria) unifasciata17 sites
- Nutricola tantilla17 sites
- Acmaea mitra16 sites
- Alia carinata16 sites
- Amphissa versicolor16 sites
- Antisabia panamensis16 sites
- Californiconus californicus16 sites
- Cumingia californica16 sites
- Fissurella volcano16 sites
- Mytilus californianus16 sites
- Crepidula adunca15 sites
- Eulithidium pulloides15 sites
- Leukoma staminea15 sites
- Lottia insessa15 sites
- Lottia limatula15 sites
The Paleobiology Database records 24 sites for Mopalia muscosa, 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
9 references- Geology of San Nicolas Island, California9
- Fossil chitons of Western North America6
- Late Pleistocene molluscan faunas from upper terraces of the Palos Verdes Hills, California4
- Late Pleistocene faunas from the northwestern coast of Baja California, Mexico4
- Late Pleistocene megafauna of Cayucos, California, and its zoogeographic significance3
- Late Pleistocene invertebrates of the Newport Bay area, California2
- Pleistocene invertebrates from Punta China, Baja California, Mexico, with remarks on the composition of the Pacific coast Quaternary faunas1
- Report on Pleistocene Molluscan Fauna at Capistrano Beach, Orange County, Calif1
- An unreported exposure of the San Pedro Pleistocene1
Each of the 31 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 Mopalia muscosa
- Source
- Wikipedia/Commons
- Credit
- nobody named on the record
- Licence
- not stated by the source
- Commercial use
- cannot be read from the licence given — check the record
No 3D scan of Mopalia muscosa 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 itMopalia through timeFormations of the PleistoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. (Gould 1846)