Alligator mcgrewi

Alligator mcgrewi is an extinct species of alligator described by K.P. Schmidt in 1941. They lived in the Early Miocene period, and their range was principally in what is now Nebraska, United States. It is a small alligator with an estimated body length of 1.6 metres (5.2 ft). A. mcgrewi has a unique snout, distinguishing it from other alligator species and implying that it evolved from specific environmental adaptations.

No picture of Alligator mcgrewi was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Alligator mcgrewi, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
AlligatorPBDB
Diet
carnivorePBDB, for Crocodylia
Motility
actively mobilePBDB, for Osteichthyes
Environment
marinePBDB, for Mesoeucrocodylia

Time the record covers

At most 2.2 million years on record.

The one occurrence read is dated to somewhere between 18.5 Mya and 16.3 Mya, which is a dating window rather than a span.

Miocene — about 1 of 1 occurrenceMiocene19–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–18 Mya — about 0.0 occurrences18–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–17 Mya — about 0.0 occurrences17–16 Mya — about 0.0 occurrences16–16 Mya — about 0.0 occurrences16–16 Mya — about 0.0 occurrences19 Mya15.8 Mya

1 occurrence of Alligator mcgrewi on record, most of them in the Miocene. 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

1 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

Runningwater — 42.75°N, 102.02°W

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The named rock units Alligator mcgrewi has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Alligator mcgrewi and its relatives

Miocene

Where Alligator mcgrewi and its relatives were recorded in the Miocene.

Found in the same rock

12 taxa

The Paleobiology Database records 1 site for Alligator mcgrewi, and this reads all of them. The number is how many of those sites it was catalogued from too.

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

1 reference

Each of the 1 occurrence 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 doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Structured light scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Alligator mcgrewi · amnh:farb:8700

No picture of Alligator mcgrewi was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Alligator mcgrewi, or no answer at all. This entry cannot say which.

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 itAlligator through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Schmidt 1941