Aeger

Aeger is a genus of fossil prawns. They first occur in the Early Triassic, and died out at the end of the Late Cretaceous. A total of 21 species are known, which makes this the most diverse genus in the family Aegeridae.

Aeger

Masur · 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
AegeridaePBDB
Diet
carnivorePBDB, for Decapoda
Life habit
semi-infaunalPBDB, for Penaeoidea
Motility
actively mobilePBDB, for Penaeoidea
Vision
well-developedPBDB, for Malacostraca

Time the record covers

At least 161 million years on record.

The record covers at least 247 Mya to 85.7 Mya. No occurrence read is dated outside 248.6 Mya to 83.6 Mya.

Early Triassic — about 2 of 33 occurrencesMiddle Triassic — about 2 of 33 occurrencesLate Triassic — about 4 of 33 occurrencesLate TriassicEarly Jurassic — about 11 of 33 occurrencesEarly JurassicMiddle Jurassic — about 2 of 33 occurrencesLate Jurassic — about 9 of 33 occurrencesLate JurassicEarly Cretaceous — about 1 of 33 occurrencesEarly CretaceousLate Cretaceous — about 2 of 33 occurrencesLate Cretaceous252–246 Mya — about 2 occurrences246–240 Mya — about 2 occurrences240–235 Mya — about 1 occurrence235–229 Mya — about 0.7 occurrences218–212 Mya — about 0.8 occurrences212–206 Mya — about 0.2 occurrences206–200 Mya — about 2 occurrences200–195 Mya — about 7 occurrences195–189 Mya — about 2 occurrences178–172 Mya — about 0.8 occurrences172–166 Mya — about 0.2 occurrences166–160 Mya — about 1 occurrence155–149 Mya — about 4 occurrences149–143 Mya — about 5 occurrences115–109 Mya — about 0.2 occurrences109–103 Mya — about 0.3 occurrences103–97 Mya — about 0.8 occurrences97–92 Mya — about 0.7 occurrences86–80 Mya — about 1 occurrence247 Mya85.7 Mya252 Mya80 Mya

33 occurrences of Aeger on record, most of them in the Early Jurassic. 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

33 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

11 formations

Lombardische Kieselkalk — 46.00°N, 9.08°ESolnhofen — 48.91°N, 11.14°ESolnhofen — 48.90°N, 11.18°ECazals — 44.50°N, 1.32°EWestbury — 51.24°N, 2.34°WOpalinus Clay — 47.49°N, 8.19°EGuanling — 24.49°N, 103.82°ELiegende Bankkalk — 48.12°N, 8.87°EEl Doctor — 20.75°N, 99.34°WReingrabener Schiefer — 47.88°N, 15.07°EZorzino Limestone — 45.78°N, 9.82°EBlue Lias — 52.22°N, 1.75°W

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The named rock units Aeger has been recovered from, largest first. Drawn where the rock is now, not where it formed. 13 occurrences have no formation on record, which is common for older literature.

Aeger and its relatives

Early Jurassic

Where Aeger and its relatives were recorded in the Early Jurassic.

Found in the same rock

380 taxa

The Paleobiology Database records 22 sites for Aeger, 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 33 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 content2

Picture of Aeger

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

3D model

Source
Sketchfab
Licence
CC0 Public Domain
Commercial use
the licence allows it

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 itAegeridae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Munster 1839