Placentalia

Placentalia is one of the three extant subdivisions of the class Mammalia, the other two being Monotremata and Marsupialia. Placentalia contains the vast majority of extant mammals, which are partly distinguished from monotremes and marsupials in that the fetus is carried in the uterus of its mother to a relatively late stage of development. The name is something of a misnomer, considering that marsupials also nourish their fetuses via a placenta, though for a relatively briefer period, giving birth to less-developed young, which are then nurtured for a period inside the mother's pouch. Placentalia represents the only living group within Eutheria, which contains all mammals that are more closely related to placentals than they are to marsupials.

Placentalia

These images belongs to their respective owners · Public Domain · 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
placentalPBDB
Sits inside
EutheriaPBDB
Diet
insectivorePBDB, for Theria
Life habit
scansorialPBDB, for Eutheria
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Eutheria

Time the record covers

At least 72 million years on record.

The record covers at least 72.2 Mya to 11.7 ka. No occurrence read is dated outside 83.6 Mya to 0 Mya.

Late Cretaceous — about 17 of 12000 occurrencesLate CretaceousPaleocene — about 2830 of 12000 occurrencesPaleoceneEocene — about 8603 of 12000 occurrencesEoceneOligocene — about 29 of 12000 occurrencesOligoceneMiocene — about 339 of 12000 occurrencesMiocenePliocene — about 69 of 12000 occurrencesPleistocene — about 97 of 12000 occurrences85–82 Mya — about 0.1 occurrences82–80 Mya — about 0.2 occurrences80–77 Mya — about 0.2 occurrences77–74 Mya — about 0.2 occurrences74–71 Mya — about 3 occurrences71–68 Mya — about 7 occurrences68–65 Mya — about 126 occurrences65–63 Mya — about 606 occurrences63–60 Mya — about 703 occurrences60–57 Mya — about 896 occurrences57–54 Mya — about 2422 occurrences54–51 Mya — about 2734 occurrences51–48 Mya — about 1067 occurrences48–45 Mya — about 977 occurrences45–43 Mya — about 743 occurrences43–40 Mya — about 743 occurrences40–37 Mya — about 375 occurrences37–34 Mya — about 44 occurrences34–31 Mya — about 12 occurrences31–28 Mya — about 10 occurrences28–26 Mya — about 7 occurrences26–23 Mya — about 5 occurrences23–20 Mya — about 9 occurrences20–17 Mya — about 7 occurrences17–14 Mya — about 34 occurrences14–11 Mya — about 82 occurrences11–8.5 Mya — about 113 occurrences8.5–5.7 Mya — about 85 occurrences5.7–2.8 Mya — about 65 occurrences2.8–0 Mya — about 124 occurrences72.2 Mya11.7 ka85 Mya0 Mya

12,000+ occurrences of Placentalia on record. 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

12,000 occurrences read

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. The read hit its cap, so every figure above is a floor and the shares are of the occurrences read. More on what this infers.

Found in

at least 155 formations

Willwood — 44.78°N, 108.97°WWillwood — 44.30°N, 109.00°WWillwood — 44.82°N, 109.05°WWillwood — 43.95°N, 107.57°WWillwood — 44.50°N, 108.00°WWillwood — 44.00°N, 108.00°WWillwood — 44.65°N, 108.54°WWillwood — 44.60°N, 108.32°WWillwood — 44.64°N, 108.43°WWillwood — 44.53°N, 108.39°WWillwood — 44.53°N, 108.32°WWillwood — 44.65°N, 109.93°WWillwood — 44.59°N, 108.86°WWillwood — 44.49°N, 108.54°WWillwood — 44.42°N, 108.69°WWillwood — 44.38°N, 108.80°WWillwood — 44.44°N, 108.63°WWillwood — 44.49°N, 108.81°WWillwood — 44.50°N, 108.67°WWillwood — 44.56°N, 108.70°WWillwood — 44.59°N, 108.62°WWillwood — 44.65°N, 108.76°WBridger — 42.70°N, 110.10°WBridger — 41.20°N, 110.50°WBridger — 41.50°N, 110.60°WBridger — 41.70°N, 109.00°WBridger — 41.22°N, 109.72°WBridger — 41.80°N, 110.70°WBridger — 42.42°N, 109.35°WBridger — 41.77°N, 110.33°WBridger — 41.13°N, 110.13°WWasatch — 41.80°N, 110.70°WWasatch — 41.27°N, 110.33°WWasatch — 43.25°N, 110.42°WWasatch — 42.70°N, 110.10°WWasatch — 40.60°N, 108.10°WWasatch — 41.70°N, 109.00°WWasatch — 41.80°N, 107.00°WWasatch — 41.20°N, 110.50°WWasatch — 43.20°N, 108.20°WWasatch — 40.00°N, 107.90°WWasatch — 42.07°N, 109.10°WWasatch — 41.75°N, 108.00°WWind River — 43.20°N, 107.10°WWind River — 44.00°N, 106.60°WWind River — 43.20°N, 108.20°WWind River — 41.60°N, 105.80°WWind River — 43.20°N, 107.33°WFort Union — 47.10°N, 104.80°WFort Union — 47.60°N, 107.00°WFort Union — 47.80°N, 106.10°WFort Union — 43.85°N, 108.35°WFort Union — 43.70°N, 108.70°WFort Union — 44.30°N, 109.00°WFort Union — 46.05°N, 104.48°WFort Union — 45.80°N, 104.40°WFort Union — 41.70°N, 109.00°WFort Union — 41.30°N, 107.74°WFort Union — 45.80°N, 109.80°WFort Union — 48.50°N, 101.90°WFort Union — 46.90°N, 101.50°WFort Union — 46.59°N, 101.74°WFort Union — 46.90°N, 103.90°WFort Union — 45.80°N, 110.50°WFort Union — 44.72°N, 108.38°WFort Union — 44.68°N, 108.32°WFort Union — 45.20°N, 109.00°WFort Union — 44.89°N, 108.93°WFort Union — 43.20°N, 107.10°WFort Union — 45.10°N, 106.90°WFort Union — 45.40°N, 105.60°WFort Union — 43.45°N, 109.16°WFort Union — 41.92°N, 108.56°WFort Union — 44.50°N, 108.00°WFort Union — 44.72°N, 108.62°WFort Union — 43.20°N, 108.20°WDeBeque — 40.00°N, 107.90°WDeBeque — 39.20°N, 108.20°WDeBeque — 39.27°N, 108.18°WDeBeque — 39.70°N, 107.60°WDeBeque — 38.70°N, 107.60°WFriars — 32.90°N, 117.10°WFriars — 32.78°N, 117.07°WNacimiento — 36.30°N, 108.20°WNacimiento — 36.31°N, 108.00°WNacimiento — 35.70°N, 107.00°WNacimiento — 36.57°N, 107.97°WNacimiento — 36.18°N, 107.58°WNacimiento — 36.27°N, 107.76°WSespe — 34.30°N, 119.00°WSespe — 34.58°N, 119.26°WSantiago — 32.90°N, 117.10°WSantiago — 33.10°N, 117.29°WSantiago — 33.40°N, 117.51°WSantiago — 33.19°N, 117.32°WPaskapoo — 51.00°N, 114.10°WPaskapoo — 51.90°N, 113.30°WPaskapoo — 53.23°N, 114.70°WPaskapoo — 52.40°N, 113.80°WPaskapoo — 52.30°N, 113.80°WPaskapoo — 52.20°N, 113.70°WPaskapoo — 51.10°N, 114.50°WPaskapoo — 51.18°N, 114.43°WPaskapoo — 52.60°N, 114.10°WPaskapoo — 52.00°N, 114.30°WPaskapoo — 52.20°N, 113.60°WPaskapoo — 51.50°N, 112.30°WPaskapoo — 52.40°N, 116.10°WPaskapoo — 54.80°N, 115.46°WPaskapoo — 54.80°N, 115.80°WPaskapoo — 51.20°N, 112.50°WUinta — 40.20°N, 109.90°WUinta — 40.08°N, 109.27°WUinta — 40.10°N, 110.20°WUinta — 40.15°N, 109.62°WUinta — 40.07°N, 109.70°WSan Jose — 36.50°N, 107.00°WSan Jose — 35.70°N, 107.00°WWagon Bed ("Tepee Trail") — 43.20°N, 107.10°WWagon Bed ("Tepee Trail") — 43.20°N, 108.20°W"Wasatch" — 44.50°N, 108.00°W"Wasatch" — 44.00°N, 106.60°W"Wasatch" — 43.90°N, 105.70°WHell Creek — 47.62°N, 107.32°WHell Creek — 46.30°N, 104.50°WHell Creek — 47.52°N, 107.00°WHell Creek — 47.80°N, 106.10°WHell Creek — 47.80°N, 106.21°WAycross — 43.20°N, 108.20°WAycross — 43.70°N, 108.70°WAycross — 43.90°N, 110.80°WAycross — 44.30°N, 109.00°WHuerfano — 37.80°N, 105.10°WGreen River — 41.80°N, 110.70°WGreen River — 40.24°N, 109.13°WGreen River — 40.60°N, 108.10°WGreen River — 41.20°N, 110.50°WGreen River — 42.70°N, 110.10°WGreen River — 41.70°N, 109.00°WGreen River — 42.45°N, 108.60°WGreen River — 40.20°N, 109.90°WWashakie — 40.60°N, 108.10°WWashakie — 41.70°N, 109.00°WDevil's Graveyard — 29.20°N, 103.20°WDevil's Graveyard — 29.90°N, 104.20°WCypress Hills — 50.20°N, 107.60°WCypress Hills — 50.00°N, 107.90°WNorth Horn — 39.10°N, 111.80°WNorth Horn — 39.00°N, 111.00°WNorth Horn — 39.18°N, 111.27°WFerris — 41.80°N, 107.00°WFerris — 41.93°N, 106.86°WFerris — 41.94°N, 106.85°W

Loading coastlines…

The named rock units Placentalia has been recovered from, largest first. Drawn where the rock is now, not where it formed. The read hit its cap, so each count is a floor. 131 further formations hold fewer occurrences each and are not listed. 1,346 occurrences have no formation on record, which is common for older literature.

Found in the same rock

1,481 taxa

The Paleobiology Database records at least 433 sites for Placentalia, and this reads 240 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

at least 636 references

Each of the 12,000 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. That read hit its cap, so each count is a floor. 624 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 Placentalia

Credit
These images belongs to their respective owners
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Placentalia 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 itEutheria through timeThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Owen 1837)