Asaphidae
Asaphidae is a family of asaphid trilobites. Although the first genera originate in Upper Cambrian marine strata, the family becomes the most widely distributed and most species-rich trilobite family during the Ordovician.

Dwergenpaartje · CC BY-SA 3.0 · 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
- AsaphoideaPBDB
- Diet
- carnivorePBDB, for Trilobita
- Life habit
- low-level epifaunalPBDB, for Asaphida
- Motility
- fast-movingPBDB, for Asaphida
- Vision
- well-developedPBDB
- Environment
- marinePBDB, for Trilobita
Time the record covers
At least 56 million years on record.
The record covers at least 497 Mya to 440.5 Mya. No occurrence read is dated outside 504.5 Mya to 432.9 Mya.
4,598 occurrences of Asaphidae on record, most of them in the Ordovician. 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
4,598 occurrences- Cambrian3%
- Ordovician97%
- Silurianunder 1%
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
579 formations
- Kope Formation187
- Holen Formation128
- Santa Rosita Formation · Santa Victoria Group123
- Outram Formation · McKay Group93
- Ninemile Formation · Pogonip Group86
- Elnes Formation84
Loading coastlines…
The named rock units Asaphidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 555 further formations hold fewer occurrences each and are not listed. 518 occurrences have no formation on record, which is common for older literature.
Asaphidae and its relatives
OrdovicianWhere Asaphidae and its relatives were recorded in the Ordovician.
Found in the same rock
1,923 taxa- Isotelus69 sites
- Strophomena45 sites
- Flexicalymene40 sites
- Sowerbyella37 sites
- Remopleurides36 sites
- Rafinesquina35 sites
- Didymograptus31 sites
- Illaenus31 sites
- Lophospira31 sites
- Lonchodomas30 sites
- Platystrophia30 sites
- Hallopora29 sites
- Megalaspides29 sites
- Ambonychia28 sites
- Ctenodonta28 sites
- Nileus27 sites
- Onniella27 sites
- Sinuites27 sites
- Climacograptus25 sites
- Zygospira25 sites
- Ampyx24 sites
- Escharopora24 sites
- Conularia23 sites
- Crinoidea23 sites
The Paleobiology Database records at least 1,497 sites for Asaphidae, and this reads 240 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
479 references- Gradient ecology of a biotic invasion: biofacies of the type Cincinnatian Series (Upper Ordovician), Cincinnati, Ohio region, USA308
- Ordovician trilobites of Argentina255
- The Asaphus Limestone in northernmost Öland135
- Analysis of sample-level properties along a paleoenvironmental gradient: the behavior of evenness as a function of sample size123
- Lower Ordovician trilobites from western Utah and eastern Nevadea117
- Untersuchungen über baltoskandische Asaphiden I Revision der mittelordovizischen Asaphiden des Siljan-Gebietes in Dalarna109
- The Middle Ordovician of the Oslo Region, Norway 13. Trilobites of the Family Asaphidae108
- Trilobites from the Survey Peak, Outram and Skoki Formations (Upper Cambrian-Lower Ordovician) at Wilcox Pass, Jasper National Park, Alberta)101
- Description of the upper portion of the drill-core from Finngrundet in the South Bothnian Bay92
- The Chazy Formation and its fauna90
- Ordovician Brachiopods, Trilobites, and Stratigraphy in Eastern and Central Nevada88
- Upper Arenig trilobite biostratigraphy and sea-level changes at Lynna River near Volkhov, Russia77
Each of the 4,598 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. 467 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 content2
Picture of Asaphidae
- Source
- Wikipedia/Commons
- Credit
- Dwergenpaartje
- Licence
- CC BY-SA 3.0
- Commercial use
- the licence allows it
CT scan
- Source
- MorphoSource
- Licence
- not stated by the source
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Asaphidae indet. · L-JH:Eb18 03 C4
The description on this site
- Source
- Wikipedia, “Asaphidae”
- 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 itAsaphoidea through timeFormations of the OrdovicianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Burmeister 1843