Hypnomys

Hypnomys, otherwise known as Balearic giant dormice, is an extinct genus of dormouse (Gliridae) in the subfamily Leithiinae. Its species are considered examples of insular gigantism. They were endemic to the Balearic Islands in the western Mediterranean from the Early Pliocene until their extinction around the 3rd millennium BC. They first appeared in the fossil record on Mallorca during the Early Pliocene, presumably as a result to the evaporation of the Mediterranean sea during the Messinian salinity crisis connecting the Balearic Islands with mainland Europe. They later spread to Menorca, and a possible molar is also known from Ibiza. Hypnomys became extinct during the late Holocene likely shortly after human arrival on the Balearics. They were one of only three native land mammals to the islands at the time of human arrival, alongside the shrew Nesiotites and goat-antelope Myotragus. Their closest living relatives are of the genus Eliomys, including the European garden dormouse.

Hypnomys

Pere Bover1,2*, Josep A. Alcover1,2, Jacques J. Michaux3, Lionel Hautier4, Rainer Hutterer2,5 · CC BY 2.5 · 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
Balearic DormicePBDB
Sits inside
DryomyinaePBDB
Diet
herbivorePBDB, for Rodentia
Life habit
ground dwellingPBDB, for Rodentia
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Eutheria

Time the record covers

At least 3.4 million years on record.

The record covers at least 3.6 Mya to 129 ka. No occurrence read is dated outside 5.333 Mya to 11.7 ka.

Miocene — about 0 of 7 occurrencesPliocene — about 4 of 7 occurrencesPliocenePleistocene — about 3 of 7 occurrencesPleistoceneHolocene — about 0 of 7 occurrences5.4–5.3 Mya — about 0.0 occurrences5.3–5.1 Mya — about 0.1 occurrences5.1–4.9 Mya — about 0.2 occurrences4.9–4.7 Mya — about 0.2 occurrences4.7–4.5 Mya — about 0.2 occurrences4.5–4.3 Mya — about 0.2 occurrences4.3–4.1 Mya — about 0.2 occurrences4.1–3.9 Mya — about 0.2 occurrences3.9–3.7 Mya — about 0.2 occurrences3.7–3.5 Mya — about 0.3 occurrences3.5–3.3 Mya — about 0.3 occurrences3.3–3.1 Mya — about 0.3 occurrences3.1–2.9 Mya — about 0.3 occurrences2.9–2.7 Mya — about 0.3 occurrences2.7–2.5 Mya — about 0.3 occurrences2.5–2.3 Mya — about 0.2 occurrences2.3–2.1 Mya — about 0.2 occurrences2.1–1.9 Mya — about 0.2 occurrences1.9–1.8 Mya — about 0.2 occurrences1.8–1.6 Mya — about 0.2 occurrences1.6–1.4 Mya — about 0.2 occurrences1.4–1.2 Mya — about 0.2 occurrences1.2–972 ka Mya — about 0.2 occurrences972 ka–778 ka Mya — about 0.2 occurrences778 ka–583 ka Mya — about 0.0 occurrences194 ka–0 Mya — about 1 occurrence3.6 Mya129 ka5.8 Mya0 Mya

7 occurrences of Hypnomys on record, most of them in the Pliocene. 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

7 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.

Hypnomys and its relatives

Pliocene

Where Hypnomys and its relatives were recorded in the Pliocene.

Found in the same rock

75 taxa

The Paleobiology Database records 7 sites for Hypnomys, 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

7 references

Each of the 7 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. 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 Hypnomys

Credit
Pere Bover1,2*, Josep A. Alcover1,2, Jacques J. Michaux3, Lionel Hautier4, Rainer Hutterer2,5
Licence
CC BY 2.5
Commercial use
the licence allows it

CT scan

Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record
Specimen
Hypnomys morpheus · na:uncatalogued

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 itDryomyinae through timeFormations of the PlioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Bate 1918