Inioidea

River dolphins also called Freshwater dolphins, are a polyphyletic group of fully aquatic mammals that reside exclusively in freshwater or even in brackish water. They are an informal grouping of dolphins, which itself is a paraphyletic group within the infraorder Cetacea. These dolphins are placed in three superfamilies, Platanistoidea (Platanistidae), Inioidea and Lipotoidea (Lipotidae). They comprise the families Platanistidae, the possibly extinct Lipotidae, Iniidae and Pontoporiidae. There are five extant species of river dolphins. River dolphins, alongside other cetaceans, belong to the clade Artiodactyla, with even-toed ungulates, and their closest living relatives the hippopotamuses, from which they diverged about 40 million years ago. Specific types of dolphins can be pink.

Inioidea

Tomas Hrbek, Vera Maria Ferreira da Silva, Nicole Dutra, Waleska Gravena, Anthony R. Martin, Izeni Pires Farias · 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
Sits inside
DelphinidaPBDB
Diet
carnivorePBDB, for Odontoceti
Life habit
aquatic, depth=surfacePBDB, for Cetacea
Motility
actively mobilePBDB, for Cetacea
Environment
marine,freshwaterPBDB, for Odontoceti

Time the record covers

At least 15 million years on record.

The record covers at least 15.98 Mya to 11.7 ka. No occurrence read is dated outside 23.04 Mya to 0 Mya.

Oligocene — about 0 of 107 occurrencesMiocene — about 75 of 107 occurrencesMiocenePliocene — about 18 of 107 occurrencesPliocenePleistocene — about 7 of 107 occurrencesPleistocene24–23 Mya — about 0.0 occurrences23–22 Mya — about 0.1 occurrences22–21 Mya — about 0.1 occurrences21–20 Mya — about 0.1 occurrences20–20 Mya — about 0.6 occurrences20–19 Mya — about 0.6 occurrences19–18 Mya — about 0.6 occurrences18–17 Mya — about 0.6 occurrences17–16 Mya — about 0.6 occurrences16–16 Mya — about 0.5 occurrences16–15 Mya — about 0.3 occurrences15–14 Mya — about 0.3 occurrences14–13 Mya — about 0.9 occurrences13–13 Mya — about 1 occurrence13–12 Mya — about 1 occurrence12–11 Mya — about 7 occurrences11–10 Mya — about 9 occurrences10–9.4 Mya — about 9 occurrences9.4–8.6 Mya — about 9 occurrences8.6–7.8 Mya — about 9 occurrences7.8–7.1 Mya — about 9 occurrences7.1–6.3 Mya — about 7 occurrences6.3–5.5 Mya — about 7 occurrences5.5–4.7 Mya — about 7 occurrences4.7–3.9 Mya — about 7 occurrences3.9–3.1 Mya — about 4 occurrences3.1–2.4 Mya — about 2 occurrences2.4–1.6 Mya — about 0.7 occurrences1.6–785 ka Mya — about 0.5 occurrences785 ka–0 Mya — about 12 occurrences15.98 Mya11.7 ka23.5 Mya0 Mya

107 occurrences of Inioidea on record, most of them in the Miocene. 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

107 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

30 formations

Pisco — 15.58°S, 74.72°WPisco — 14.56°S, 75.67°WPisco — 15.44°S, 74.87°WPisco — 15.50°S, 74.80°WPisco — 14.52°S, 75.71°WPisco — 14.33°S, 75.90°WPisco — 14.31°S, 75.81°WPisco — 14.45°S, 75.75°WBahía Inglesa — 27.08°S, 70.84°WBahía Inglesa — 27.14°S, 70.88°WBahía Inglesa — 27.16°S, 70.89°WYorktown — 35.36°N, 76.82°WYorktown — 36.45°N, 77.08°WPeace River — 27.68°N, 81.95°WPeace River — 27.83°N, 81.97°WPeace River — 27.90°N, 81.80°WEntre Rios — 27.08°S, 64.47°WEntre Rios — 33.72°S, 59.25°WSolimoes — 10.12°S, 66.88°WSolimoes — 7.66°S, 72.54°WUrumaco — 11.25°N, 70.27°WUrumaco — 11.18°N, 70.23°WUrumaco — 11.17°S, 70.30°WBreda — 52.15°N, 6.61°EBreda — 51.70°N, 5.73°EBreda — 51.37°N, 3.91°EItuzaingo — 31.48°S, 60.23°WCoquimbo — 29.98°S, 71.39°WCoquimbo — 29.97°S, 71.35°WGram — 55.47°N, 8.45°EUpper Coralline Limestone — 35.95°N, 14.34°ESenhata — 35.16°N, 139.86°ESenhata — 35.16°N, 138.86°EChagres Sandstone — 9.28°N, 80.04°WCodore — 11.28°S, 70.20°WCodore — 11.26°N, 70.28°WSalsomaggiore — 44.73°N, 10.03°ESahabi — 30.14°N, 20.75°EParana — 31.38°S, 60.23°WTirabuzon — 27.31°N, 112.25°WPungo River — 35.40°N, 76.80°WCamacho — 34.46°S, 57.83°WSt Marys — 38.34°N, 76.41°WChui — 31.11°S, 50.98°WCastillo — 10.37°N, 70.05°W

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The named rock units Inioidea has been recovered from, largest first. Drawn where the rock is now, not where it formed. 6 further formations hold fewer occurrences each and are not listed. 19 occurrences have no formation on record, which is common for older literature.

Inioidea and its relatives

Miocene

Where Inioidea and its relatives were recorded in the Miocene.

Found in the same rock

1,461 taxa

The Paleobiology Database records 77 sites for Inioidea, 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

76 references

Each of the 107 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. 64 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 Inioidea

Credit
Tomas Hrbek, Vera Maria Ferreira da Silva, Nicole Dutra, Waleska Gravena, Anthony R. Martin, Izeni Pires Farias
Licence
CC BY 2.5
Commercial use
the licence allows it

No 3D scan of Inioidea 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 itDelphinida through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. de Muizon 1988