Hedenstroemia

Hedenstroemia is an extinct genus of Early Triassic (Olenekian) cephalopods in the ammonoid order Ceratitida. They were nektonic carnivores.

Hedenstroemia

Hectonichus · 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
Sits inside
HedenstroemiidaePBDB
Diet
carnivorePBDB, for Ceratitida
Life habit
nektonicPBDB, for Ceratitida
Motility
actively mobilePBDB, for Ceratitida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At most 5 million years on record.

Every occurrence read is dated to somewhere between 251.902 Mya and 247 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Permian — about 0 of 67 occurrencesEarly Triassic — about 67 of 67 occurrencesEarly TriassicMiddle Triassic — about 0 of 67 occurrences252–252 Mya — about 0.1 occurrences252–252 Mya — about 0.1 occurrences252–251 Mya — about 0.1 occurrences251–251 Mya — about 0.1 occurrences251–251 Mya — about 0.1 occurrences251–251 Mya — about 0.1 occurrences251–251 Mya — about 5 occurrences251–250 Mya — about 5 occurrences250–250 Mya — about 5 occurrences250–250 Mya — about 5 occurrences250–250 Mya — about 5 occurrences250–250 Mya — about 5 occurrences250–249 Mya — about 5 occurrences249–249 Mya — about 5 occurrences249–249 Mya — about 5 occurrences249–249 Mya — about 5 occurrences249–249 Mya — about 5 occurrences249–248 Mya — about 2 occurrences248–248 Mya — about 0.9 occurrences248–248 Mya — about 0.9 occurrences248–248 Mya — about 0.9 occurrences248–248 Mya — about 0.9 occurrences248–247 Mya — about 0.9 occurrences247–247 Mya — about 0.9 occurrences247–247 Mya — about 0.9 occurrences247–247 Mya — about 0.4 occurrences252.4 Mya246.5 Mya

67 occurrences of Hedenstroemia on record, most of them in the Early Triassic. 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

67 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

13 formations

Mikin — 31.97°N, 78.02°EThaynes — 42.69°N, 111.47°WThaynes — 42.12°N, 111.25°WThaynes — 39.41°N, 113.69°WThaynes — 38.67°N, 112.52°WCeratite Sandstone — 32.66°N, 71.80°ECeratite Sandstone — 32.78°N, 71.65°ECeratite Sandstone — 32.55°N, 71.79°ETraveston — 26.25°S, 152.72°EUnion Wash — 36.70°N, 118.03°WZhitkov — 42.92°N, 132.30°ELazurnaya — 42.93°N, 132.42°ELazurnaya Bay — 42.92°N, 132.33°EBjorne — 77.76°N, 87.50°WBlind Fiord — 80.49°N, 94.47°WCeratite Marls — 32.66°N, 71.80°ESinbad — 38.27°N, 111.39°WCephalopod Limestone — 9.71°S, 124.31°E

Loading coastlines…

The named rock units Hedenstroemia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 31 occurrences have no formation on record, which is common for older literature.

Hedenstroemia and its relatives

Early Triassic

Where Hedenstroemia and its relatives were recorded in the Early Triassic.

Found in the same rock

239 taxa

The Paleobiology Database records 59 sites for Hedenstroemia, 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

20 references

Each of the 67 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. 8 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 Hedenstroemia

Credit
Hectonichus
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Hedenstroemia was found in MorphoSource and Sketchfab.

Smithsonian Open Access was 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 itHedenstroemiidae through timeFormations of the Early TriassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Waagen 1895