Hurdiidae

Junnn11 · CC BY-SA 4.0 · via Wikidata/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
- RadiodontaPBDB
- Diet
- carnivorePBDB, for Radiodonta
- Life habit
- nektonicPBDB, for Radiodonta
- Motility
- fast-movingPBDB, for Radiodonta
Time the record covers
At least 103 million years on record.
The record covers at least 514.5 Mya to 410.62 Mya. No occurrence read is dated outside 521 Mya to 393.47 Mya.
59 occurrences of Hurdiidae on record, most of them in the Cambrian. 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
59 occurrences- Cambrian97%
- Ordovician2%
- Devonian2%
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
12 formations
- Burgess Shale Formation · Chancellor Group27
- Stephen Formation7
- Wheeler Shale Formation7
- Balang Formation6
- Marjum Formation5
- Jince Formation1
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The named rock units Hurdiidae has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Hurdiidae and its relatives
CambrianWhere Hurdiidae and its relatives were recorded in the Cambrian.
Found in the same rock
468 taxa- Hurdia23 sites
- Sidneyia22 sites
- Liangshanella21 sites
- Lingulella21 sites
- Haplophrentis carinatus20 sites
- Hazelia20 sites
- Naraoia compacta20 sites
- Burgessia19 sites
- Diraphora19 sites
- Ehmaniella burgessensis19 sites
- Marrella splendens19 sites
- Ottoia prolifica19 sites
- Pentagnostus praecurrens19 sites
- Selkirkia columbia19 sites
- Wiwaxia corrugata19 sites
- Yohoia19 sites
- Laggania18 sites
- Micromitra18 sites
- Morania18 sites
- Scenella amii18 sites
- Trilobita18 sites
- Waptia fieldensis18 sites
- Acrothyra17 sites
- Canadaspis perfecta17 sites
The Paleobiology Database records 42 sites for Hurdiidae, 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
20 references- Paleoecology of the Greater Phyllopod Bed community, Burgess Shale19
- The diverse radiodont fauna from the Marjum Formation of Utah, USA (Cambrian: Drumian)11
- A Cambrian soft-bodied biota after the first Phanerozoic mass extinction4
- A new Burgess Shale–type assemblage from the “thin” Stephen Formation of the southern Canadian Rockies4
- New anomalocaridid appendages from the Burgess Shale, Canada4
- Burgess Shale fossils shed light on the agnostid problem2
- Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah2
- First report of the hurdiid radiodont Ursulinacaris from the Cambrian Kaili Biota, South China1
- First report of the Pingding locality of the Balang Lagerstätte (Cambrian Stage 4), South China: Implications for community complexity and geographic variation1
- Occurrence of the hurdiid radiodont Cambroraster in the middle Cambrian (Wuliuan) Mantou Formation of North China1
- The Qingjiang biota - A Burgess Shale-type fossil Lagerstätte from the early Cambrian of South China1
- Hurdiid radiodontans from the middle Cambrian (Series 3) of Utah1
Each of the 59 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. 8 further references are not listed. 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

Picture of Hurdiidae
- Source
- Wikidata/Commons
- Credit
- Junnn11
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Hurdiidae 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.
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itRadiodonta through timeFormations of the CambrianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Vinther et al. 2014