Hypanis plicata

Hypanis plicata, the folded lagoon cockle, is a brackish-water bivalve mollusc of the family Cardiidae and is the only living member of the genus Hypanis. It has an oval, thin, semitranslucent shell, up to 30–45 mm (1.2–1.8 in) in length, with irregularly placed sharp ribs. The species is found in the shallow parts of the Caspian Sea and was formerly common in estuaries and lagoons of the northwestern coast of the Black Sea, including the Razelm–Sinoe Lagoon complex, the Dniester Liman and the Dnieper–Bug Estuary. As of the 21st century, the Black Sea populations have largely declined due to human-driven salinity changes and may have become extinct. H. plicata is a mobile filter feeder that burrows into soft sediments or bores deep into hard clay, leaving its long, fused siphons on the surface and feeding on plankton and suspended detritus. The structure of its shell and the ability to bore into solid substrates resemble bivalves of the family Pholadidae, which is believed to be a result of convergent evolution. The species typically lives at depths down to 30 m (98 ft). It is considered edible. Its larvae, juveniles and adults likely act as a food source for bottom-feeding fish.

Hypanis plicata

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
Sits inside
HypanisPBDB
Diet
suspension feederPBDB, for Cardiidae
Life habit
infaunalPBDB, for Cardiidae
Motility
facultatively mobilePBDB, for Cardiidae
Vision
blindPBDB, for Bivalvia

Time the record covers

At most 118 thousand years on record.

The one occurrence read is dated to somewhere between 129 ka and 11.7 ka, which is a dating window rather than a span.

Pleistocene — about 1 of 1 occurrencePleistoceneHolocene — about 0 of 1 occurrence147 ka–126 ka Mya — about 0.0 occurrences126 ka–105 ka Mya — about 0.2 occurrences105 ka–84 ka Mya — about 0.2 occurrences84 ka–63 ka Mya — about 0.2 occurrences63 ka–42 ka Mya — about 0.2 occurrences42 ka–21 ka Mya — about 0.2 occurrences21 ka–0 Mya — about 0.1 occurrences629 ka0 Mya

1 occurrence of Hypanis plicata 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

1 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.

Hypanis plicata and its relatives

Pleistocene

Where Hypanis plicata and its relatives were recorded in the Pleistocene.

Found in the same rock

27 taxa

The Paleobiology Database records 1 site for Hypanis plicata, 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

1 reference

Each of the 1 occurrence 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 doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Picture of Hypanis plicata

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 Hypanis plicata 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 itHypanis through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Eichwald 1829)