Glycymeris septentrionalis

Glycymeris septentrionalis is a species of marine bivalve mollusk in the family Glycymerididae. Native to the northeastern Pacific Ocean, it occurs along the coasts of Alaska, British Columbia, and adjacent regions. The species possesses a thick, subcircular shell with numerous radial ribs and a characteristic taxodont hinge composed of many small teeth. It inhabits sandy and gravelly seabeds in shallow water marine environments and at greater depths offshore.

Glycymeris septentrionalis

WindBorneListener · CC0 · 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
northern bittersweetPBDB
Sits inside
GlycymerisPBDB
Diet
suspension feederPBDB, for Glycymeris
Life habit
infaunalPBDB, for Glycymeris
Motility
facultatively mobilePBDB, for Glycymeris
Vision
blindPBDB, for Bivalvia
Environment
coastal,inner shelf,outer shelf,oceanicPBDB, for Glycymerididae

Time the record covers

At least 20 million years on record.

The record covers at least 20.45 Mya to 129 ka. No occurrence read is dated outside 23.04 Mya to 0 Mya.

Oligocene — about 0 of 80 occurrencesMiocene — about 4 of 80 occurrencesMiocenePliocene — about 16 of 80 occurrencesPliocenePleistocene — about 60 of 80 occurrencesPleistocene24–23 Mya — about 0.1 occurrences23–22 Mya — about 0.3 occurrences22–21 Mya — about 0.3 occurrences21–20 Mya — about 0.3 occurrences12–11 Mya — about 0.3 occurrences11–10 Mya — about 0.4 occurrences10–9.4 Mya — about 0.4 occurrences9.4–8.6 Mya — about 0.4 occurrences8.6–7.8 Mya — about 0.4 occurrences7.8–7.1 Mya — about 0.4 occurrences7.1–6.3 Mya — about 0.4 occurrences6.3–5.5 Mya — about 0.4 occurrences5.5–4.7 Mya — about 4 occurrences4.7–3.9 Mya — about 4 occurrences3.9–3.1 Mya — about 5 occurrences3.1–2.4 Mya — about 5 occurrences2.4–1.6 Mya — about 5 occurrences1.6–785 ka Mya — about 3 occurrences785 ka–0 Mya — about 51 occurrences20.45 Mya129 ka23.5 Mya0 Mya

80 occurrences of Glycymeris septentrionalis 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

80 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

15 formations

Palos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.71°N, 118.27°WPalos Verdes Sand — 33.80°N, 118.17°WPalos Verdes Sand — 33.66°N, 117.94°WEtchegoin — 36.25°N, 120.31°WEtchegoin — 36.23°N, 120.31°WEtchegoin — 36.12°N, 120.41°WUnnamed — 33.24°N, 119.51°WLomita Marl — 33.79°N, 118.34°WJacalitos — 36.09°N, 120.50°WJacalitos — 36.09°N, 120.41°WJacalitos — 35.97°N, 120.18°WJacalitos — 35.94°N, 120.15°WJacalitos — 36.14°N, 120.64°WSan Pedro Sand — 33.74°N, 118.28°WCareaga Sandstone — 34.82°N, 120.45°WCareaga Sandstone — 34.88°N, 120.51°WNiguel — 33.64°N, 117.89°WJewett — 35.49°N, 118.85°WErmanovskaya — 58.50°N, 159.17°ETowsley — 34.36°N, 118.51°WFernando — 34.05°N, 118.25°WSan Joaquin — 36.27°N, 120.28°WPalos Verdes — 33.63°N, 117.90°WSan Diego — 32.54°N, 117.11°W

Loading coastlines…

The named rock units Glycymeris septentrionalis has been recovered from, largest first. Drawn where the rock is now, not where it formed. 24 occurrences have no formation on record, which is common for older literature.

Glycymeris septentrionalis and its relatives

Pleistocene

Where Glycymeris septentrionalis and its relatives were recorded in the Pleistocene.

Found in the same rock

1,283 taxa

The Paleobiology Database records 64 sites for Glycymeris septentrionalis, and this reads all of them. Of that, one read hit the database's own return limit, so every count below is a floor rather than a total. 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

30 references

Each of the 80 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. 18 further references are not listed. 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 Glycymeris septentrionalis

Credit
WindBorneListener
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Glycymeris septentrionalis 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 itGlycymeris through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Middendorf 1849)