Phrynosoma modestum

The roundtail horned lizard is a species of lizard in the family Phrynosomatidae. It is one of the smaller species of the horned lizards. The specific epithet, modestum, is Latin, meaning "modest" or "calm". The species is native to the United States, in western Texas, New Mexico, eastern Arizona, and southeastern Colorado; and eight states in northcentral Mexico, where it is referred to as tapayaxtin.

Phrynosoma modestum

The original uploader was Dawson at English Wikipedia . · CC BY-SA 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
Roundtail horned lizardPBDB
Sits inside
PhrynosomaPBDB
Diet
omnivorePBDB, for Iguanidae
Life habit
ground dwellingPBDB, for Iguanidae
Motility
actively mobilePBDB, for Osteichthyes
Environment
terrestrialPBDB, for Amniota

Time the record covers

At most 129 thousand years on record.

Every occurrence read is dated to somewhere between 129 ka and 0 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Pleistocene — about 2 of 2 occurrencesPleistoceneHolocene — about 0 of 2 occurrences147 ka–126 ka Mya — about 0.1 occurrences126 ka–105 ka Mya — about 0.3 occurrences105 ka–84 ka Mya — about 0.3 occurrences84 ka–63 ka Mya — about 0.3 occurrences63 ka–42 ka Mya — about 0.3 occurrences42 ka–21 ka Mya — about 0.3 occurrences21 ka–0 Mya — about 0.2 occurrences629 ka0 Mya

2 occurrences of Phrynosoma modestum on record, most of them in the Pleistocene. 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

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.

Phrynosoma modestum and its relatives

Pleistocene

Where Phrynosoma modestum and its relatives were recorded in the Pleistocene.

Found in the same rock

121 taxa

The Paleobiology Database records 2 sites for Phrynosoma modestum, 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. 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 Phrynosoma modestum

Credit
The original uploader was Dawson at English Wikipedia .
Licence
CC BY-SA 2.5
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Phrynosoma modestum · TNHC:Herpetology:48520

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 itPhrynosoma through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Girard 1852