Cyanoplax keepiana

Cyanoplax keepiana, also known as Keep's chiton, is a species of chiton native to the Pacific coast of North America. According to the Cabrillo Marine Aquarium in San Pedro, Keep's chiton has "brilliant blue markings on its plates that can only be appreciated with a hand lens". These small chitons, less than an inch long, are usually found in fairly warm water in sandy or rocky tide pools located between Cayucos, California, and the Revillagigedo Islands of Mexico.

Cyanoplax keepiana

(c) Cricket Raspet, some rights reserved (CC BY) · CC BY 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
Also called
keep's chitonPBDB
Sits inside
CyanoplaxPBDB
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 most 763 thousand years on record.

Every occurrence read is dated to somewhere between 774 ka and 11.7 ka, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Pleistocene — about 4 of 4 occurrencesPleistoceneHolocene — about 0 of 4 occurrences807 ka–764 ka Mya — about 0.0 occurrences764 ka–722 ka Mya — about 0.1 occurrences722 ka–679 ka Mya — about 0.1 occurrences679 ka–637 ka Mya — about 0.1 occurrences637 ka–595 ka Mya — about 0.1 occurrences595 ka–552 ka Mya — about 0.1 occurrences552 ka–510 ka Mya — about 0.1 occurrences510 ka–467 ka Mya — about 0.1 occurrences467 ka–425 ka Mya — about 0.1 occurrences425 ka–382 ka Mya — about 0.1 occurrences382 ka–340 ka Mya — about 0.1 occurrences340 ka–297 ka Mya — about 0.1 occurrences297 ka–255 ka Mya — about 0.1 occurrences255 ka–212 ka Mya — about 0.1 occurrences212 ka–170 ka Mya — about 0.1 occurrences170 ka–127 ka Mya — about 0.2 occurrences127 ka–85 ka Mya — about 0.7 occurrences85 ka–42 ka Mya — about 0.7 occurrences42 ka–0 Mya — about 0.5 occurrences1.27 Mya0 Mya

4 occurrences of Cyanoplax keepiana 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

4 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

Palos Verdes Sand — 33.60°N, 117.88°W

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The named rock units Cyanoplax keepiana has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 occurrences have no formation on record, which is common for older literature.

Cyanoplax keepiana and its relatives

Pleistocene

Where Cyanoplax keepiana and its relatives were recorded in the Pleistocene.

Found in the same rock

503 taxa

The Paleobiology Database records 2 sites for Cyanoplax keepiana, 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

3 references

Each of the 4 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 Cyanoplax keepiana

Credit
(c) Cricket Raspet, some rights reserved (CC BY)
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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 itCyanoplax through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Berry 1948)