Hemitriakis

Hemitriakis is a genus of houndsharks in the family Triakidae.

Hemitriakis

RYO SATO from Hamamatsu, Shizuoka, Japan · CC BY-SA 2.0 · 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
TriakidaePBDB
Diet
carnivorePBDB, for Carcharhiniformes
Life habit
nektonicPBDB, for Carcharhiniformes
Motility
actively mobilePBDB, for Carcharhiniformes

Time the record covers

At most 6.7 million years on record.

The one occurrence read is dated to somewhere between 20.45 Mya and 13.82 Mya, which is a dating window rather than a span.

Miocene — about 1 of 1 occurrenceMiocene21–20 Mya — about 0.0 occurrences20–20 Mya — about 0.0 occurrences20–20 Mya — about 0.0 occurrences20–20 Mya — about 0.0 occurrences20–19 Mya — about 0.0 occurrences19–19 Mya — about 0.0 occurrences19–19 Mya — about 0.0 occurrences19–19 Mya — about 0.0 occurrences19–18 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 occurrences17–16 Mya — about 0.0 occurrences16–16 Mya — about 0.0 occurrences16–16 Mya — about 0.0 occurrences16–16 Mya — about 0.0 occurrences16–15 Mya — about 0.0 occurrences15–15 Mya — about 0.0 occurrences15–15 Mya — about 0.0 occurrences15–15 Mya — about 0.0 occurrences15–14 Mya — about 0.0 occurrences14–14 Mya — about 0.0 occurrences14–14 Mya — about 0.0 occurrences14–14 Mya — about 0.0 occurrences20.9 Mya13.3 Mya

1 occurrence of Hemitriakis on record, most of them in the Miocene. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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

Makino — 34.75°N, 136.27°E

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

Hemitriakis and its relatives

Miocene

Where Hemitriakis and its relatives were recorded in the Miocene.

Found in the same rock

9 taxa

The Paleobiology Database records 1 site for Hemitriakis, 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 content2

Picture of Hemitriakis

Credit
RYO SATO from Hamamatsu, Shizuoka, Japan
Licence
CC BY-SA 2.0
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Hemitriakis japanica · Vouchered object contributed by Allison Bronson

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 itTriakidae through timeFormations of the MioceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Herre 1923