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Agnostida β
| Description | Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian. They are present in the Lower Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders. The last agnostids went extinct in the Late Ordovician. From Wikipedia article at https://en.wikipedia.org/wiki/Agnostida, which is released under the Creative Commons Attribution-Share-Alike License 3.0. | |||||||||||||||||||||||||||||||||||||||
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| Source Data |
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| Rank | order | |||||||||||||||||||||||||||||||||||||||
| Taxonomy (GBIF,PBDB) | Life : Animalia : Arthropoda : Trilobita : Agnostida | |||||||||||||||||||||||||||||||||||||||
| Taxonomic Status (GBIF) | accepted | |||||||||||||||||||||||||||||||||||||||
| Classification (PBDB,GBIF) |
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| Scientific Name | Agnostida | |||||||||||||||||||||||||||||||||||||||
| Opinions (PBDB) |
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| Status (PBDB) | extinct | |||||||||||||||||||||||||||||||||||||||
| Taxon Size (PBDB) | 592 | |||||||||||||||||||||||||||||||||||||||
| First Recorded Appearance | 530 - 513 Ma Cambrian | |||||||||||||||||||||||||||||||||||||||
| Last Recorded Appearance | 445 - 443 Ma Paleozoic | |||||||||||||||||||||||||||||||||||||||
| Environment | marine (based on Trilobita) | |||||||||||||||||||||||||||||||||||||||
| Motility | slow-moving | |||||||||||||||||||||||||||||||||||||||
| Diet | detritivore | |||||||||||||||||||||||||||||||||||||||
| Ontogeny | molting,addition of parts (based on Trilobita) | |||||||||||||||||||||||||||||||||||||||
| Ecospace Comments | ECOSPACE CODE: 121. | |||||||||||||||||||||||||||||||||||||||
| Taphonomy | low Mg calcite, chitin (based on Trilobita) | |||||||||||||||||||||||||||||||||||||||
| Primary Reference (PBDB) | J. J. Sepkoski, Jr. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560 | |||||||||||||||||||||||||||||||||||||||
| Wikipedia | https://en.wikipedia.org/wiki/Agnostida |
External Images
Fossil Distribution
Subtaxa
| Name | Status | Common Name(s) | Fossil Occurrences | Oldest | Youngest |
|---|---|---|---|---|---|
| Agnostina β suborder | listed (PBDB) | 72 | 530 Ma Cambrian | 485 Ma Cambrian | |
| Agnostoidea β superfamily | listed (PBDB) | 1,061 | 513 Ma Cambrian | 479 Ma Early/Lower Ordovician | |
| Agnostidae β family | accepted (GBIF) listed (PBDB) | 1,705 | 516 Ma Cambrian | 458 Ma Middle Ordovician | |
| Ammagnostidae β family | accepted (GBIF) listed (PBDB) | 1 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Anomocaridae β family | accepted (GBIF) listed (PBDB) | 68 | 516 Ma Cambrian | 497 Ma Cambrian | |
| Calodiscidae β family | accepted (GBIF) listed (PBDB) | 43 | 520 Ma Cambrian | 513 Ma Cambrian | |
| Clavagnostidae β family | accepted (GBIF) listed (PBDB) | 129 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Condylopygidae β family | accepted (GBIF) listed (PBDB) | 17 | 530 Ma Cambrian | 513 Ma Cambrian | |
| Diplagnostidae β family | accepted (GBIF) listed (PBDB) | 860 | 513 Ma Cambrian | 479 Ma Early/Lower Ordovician | |
| Eodiscidae β family | accepted (GBIF) listed (PBDB) | 201 | 541 Ma Cambrian | 441 Ma Silurian | |
| Geragnostidae family | accepted (GBIF) | No associated record in PBDB | |||
| Glyptagnostidae β family | accepted (GBIF) listed (PBDB) | ||||
| Hastagnostidae family | accepted (GBIF) | No associated record in PBDB | |||
| Hebediscidae β family | accepted (GBIF) listed (PBDB) | 30 | 530 Ma Cambrian | 516 Ma Cambrian | |
| Hypagnostoidae β family | accepted (GBIF) listed (PBDB) | 1 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Marjumiidae β family | accepted (GBIF) listed (PBDB) | 110 | 516 Ma Cambrian | 501 Ma Cambrian | |
| Metagnostidae β family | accepted (GBIF) listed (PBDB) | 518 | 501 Ma Cambrian | 445 Ma Late/Upper Ordovician | |
| Pagetiidae β family | accepted (GBIF) listed (PBDB) | 1 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Peronopsidae β family | accepted (GBIF) listed (PBDB) | 310 | 516 Ma Cambrian | 485 Ma Cambrian | |
| Phalachromidae family | accepted (GBIF) | No associated record in PBDB | |||
| Phalacromidae β family | accepted (GBIF) listed (PBDB) | 95 | 513 Ma Cambrian | 479 Ma Early/Lower Ordovician | |
| Pseudagnostidae β family | accepted (GBIF) listed (PBDB) | 200 | 501 Ma Cambrian | 499 Ma Cambrian | |
| Ptychagnostidae β family | accepted (GBIF) listed (PBDB) | 585 | 513 Ma Cambrian | 479 Ma Early/Lower Ordovician | |
| Quadragnostidae β family | accepted (GBIF) listed (PBDB) | ||||
| Solenopleuridae β family | accepted (GBIF) listed (PBDB) | 291 | 541 Ma Cambrian | 433 Ma Silurian | |
| Sphaeragnostidae β family | accepted (GBIF) listed (PBDB) | 19 | 466 Ma Middle Ordovician | 450 Ma Late/Upper Ordovician | |
| Spinagnostidae β family | accepted (GBIF) listed (PBDB) | 517 | 516 Ma Cambrian | 485 Ma Cambrian | |
| Tsunyidiscidae β family | accepted (GBIF) listed (PBDB) | 63 | 520 Ma Cambrian | 516 Ma Cambrian | |
| Weymouthiidae β family | accepted (GBIF) listed (PBDB) | 43 | 541 Ma Cambrian | 513 Ma Cambrian | |
| Yukoniidae β family | accepted (GBIF) listed (PBDB) | 6 | 541 Ma Cambrian | 516 Ma Cambrian | |
| Quadrahomagnostinae β subfamily | listed (PBDB) | ||||
| Agnostogonus β genus | accepted (GBIF) listed (PBDB) | 17 | 505 Ma Cambrian | 501 Ma Cambrian | |
| Aistagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Allobodochus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Aotagnostus genus | accepted (GBIF) | No associated record in PBDB | |||
| Armagnostus β genus | accepted (GBIF) listed (PBDB) | ||||
| Blystagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Ceragnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Chatkalagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Chelediscus β genus | accepted (GBIF) listed (PBDB) | ||||
| Cristagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Delagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Dicerodiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Dignagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Dipharus genus | accepted (GBIF) | No associated record in PBDB | |||
| Dividuagnostus β genus | accepted (GBIF) listed (PBDB) | 4 | 467 Ma Middle Ordovician | 458 Ma Middle Ordovician | |
| Dolichoagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Egyngolia β genus | doubtful (GBIF) listed (PBDB) | ||||
| Euagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Formagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Glaberagnostus β genus | accepted (GBIF) listed (PBDB) | 28 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Granuloagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Gratagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Jinghediscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Kiskinella β genus | doubtful (GBIF) listed (PBDB) | ||||
| Kymagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Lavsanodiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Lenadiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Litometopus β genus | accepted (GBIF) listed (PBDB) | ||||
| Megagnostus β genus | accepted (GBIF) listed (PBDB) | 7 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Meniscuchus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Micagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Miraculaspis β genus | doubtful (GBIF) listed (PBDB) | ||||
| Monexagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Ninadiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Oodiscus β genus | accepted (GBIF) listed (PBDB) | ||||
| Pleurinodus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Pseudocobboldia β genus | doubtful (GBIF) listed (PBDB) | ||||
| Rhodotypiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Semadiscus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Stigmadiscus β genus | accepted (GBIF) listed (PBDB) | ||||
| Tasagnostus β genus | doubtful (GBIF) listed (PBDB) | ||||
| Triangulina β genus | listed (PBDB) | ||||
| Valenagnostus β genus | accepted (GBIF) listed (PBDB) | 19 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Xyoeax β genus | doubtful (GBIF) listed (PBDB) | ||||
| Yukonia β genus | accepted (GBIF) listed (PBDB) | ||||
| Yukonides β genus | accepted (GBIF) listed (PBDB) | 4 | 541 Ma Cambrian | 541 Ma Cambrian | |
Synonymy List
| Year | Name and Author |
|---|---|
| 1864 | Agnostida Salter |
| 1957 | Agnostida Harrington and Leanza |
| 1968 | Agnostida Robison and Pantoja-Alor p. 775 |
| 1972 | Agnostida Palmer and Gatehouse p. 9 |
| 1992 | Agnostida Bengtson p. 1022 |
| 1997 | Agnostida Whittington et al. p. 331 |
| 2002 | Agnostida Sepkoski, Jr. |
| 2008 | Agnostida Landing et al. p. 892 |
References
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
House Range, Millard County, Utah, USA