Jasus

Jasus is a genus of spiny lobsters which live in the oceans of the Southern Hemisphere. They have two distinct "horns" projecting from the front of the carapace, but lack the stridulating organs present in almost all other genera of spiny lobsters. Like all spiny lobsters, they lack claws, and have long stout antennae which are quite flexible.

Jasus

Stemonitis · 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
PalinuridaePBDB
Diet
carnivorePBDB, for Decapoda
Life habit
epifaunalPBDB, for Palinuridae
Motility
actively mobilePBDB, for Malacostraca
Vision
well-developedPBDB, for Malacostraca

Time the record covers

At least 75 million years on record.

The record covers at least 93.9 Mya to 18.7 Mya. No occurrence read is dated outside 100.5 Mya to 15.9 Mya.

Early Cretaceous — about 0 of 2 occurrencesLate Cretaceous — about 1 of 2 occurrencesLate CretaceousPaleocene — about 0 of 2 occurrencesEocene — about 0 of 2 occurrencesOligocene — about 0 of 2 occurrencesMiocene — about 1 of 2 occurrencesMiocene102–99 Mya — about 0.2 occurrences99–96 Mya — about 0.4 occurrences96–93 Mya — about 0.4 occurrences20–17 Mya — about 0.6 occurrences17–14 Mya — about 0.4 occurrences93.9 Mya18.7 Mya102 Mya14 Mya

2 occurrences of Jasus on record, most of them in the Late Cretaceous. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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

2 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

Tarakohe Mudstone — 40.83°S, 172.90°E

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The named rock units Jasus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Jasus and its relatives

Late Cretaceous

Where Jasus and its relatives were recorded in the Late Cretaceous.

Found in the same rock

27 taxa

The Paleobiology Database records 2 sites for Jasus, 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

2 references

Each of the 2 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content1

Picture of Jasus

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

No 3D scan of Jasus 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 itPalinuridae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Parker 1883