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Ptychagnostidae ✝

Description

Ptychagnostidae is a family of agnostid trilobites from the 5th Stage to the Paibian Age of the Cambrian (509 to 497 million years ago). The family includes several important index fossils.


Source Data
SourceIDLink
Global Biodiversity Information Facility ID (GBIF)4639507https://www.gbif.org/species/4639507
PaleoBioDB ID (PBDB)85401https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=85401
Rankfamily
Taxonomy (GBIF,PBDB)Life : Animalia : Arthropoda : Trilobita : Agnostida : Ptychagnostidae
Taxonomic Status (GBIF)accepted
Classification
RankNameAuthor
kingdomAnimaliaLinnaeus 1758
Bilateria
EubilateriaAx 1987
ProtostomiaGrobben 1908
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
subphylumMandibulata
classTrilobitaWalch 1771
orderAgnostidaSalter 1864
familyPtychagnostidaeKobayashi 1939
Unranked entries are considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors may disagree about how to rank taxa.
Scientific NamePtychagnostidae
Status (PBDB)extinct
Taxon Size (PBDB)62
First Recorded Appearance513 - 505 Ma
Cambrian
Last Recorded Appearance479 - 466 Ma
Ordovician
Environmentmarine (based on Trilobita)
Motilityslow-moving (based on Agnostida)
Visionblind
Dietdetritivore (based on Agnostida)
Ontogenymolting,addition of parts (based on Trilobita)
Ecospace CommentsBODY SIZE: Based on component genera; 3 of 3 genera share 10 to < 100 length, 3 of 3 share 10 to < 100 width.
Taphonomylow Mg calcite, chitin (based on Trilobita)
Primary Reference (PBDB)S. R. Westrop, R. Ludvigsen, and C. H. Kindle. 1996. Marjuman (Cambrian) agnostoid trilobites of the Cow Head Group, western Newfoundland. Journal of Paleontology 70(5):804-829
Wikipediahttps://en.wikipedia.org/wiki/Ptychagnostidae

Fossil Distribution

Subtaxa

NameStatusCommon Name(s)Fossil OccurrencesOldestYoungest
Goniagnostus
genus
accepted76513 Ma
Cambrian
497 Ma
Cambrian
Lejopyge
genus
accepted138513 Ma
Cambrian
466 Ma
Middle Ordovician
Myrmecomimus
genus
accepted3505 Ma
Cambrian
499 Ma
Cambrian
Onymagnostus
genus
accepted18513 Ma
Cambrian
501 Ma
Cambrian
Pentagnostus
genus
accepted41513 Ma
Cambrian
501 Ma
Cambrian
Ptychagnostus
genus
accepted215513 Ma
Cambrian
485 Ma
Cambrian
Tomagnostus
genus
accepted11513 Ma
Cambrian
501 Ma
Cambrian
Triplagnostus
genus
accepted29513 Ma
Cambrian
497 Ma
Cambrian
Yakutiana
genus
accepted51513 Ma
Cambrian
497 Ma
Cambrian
Zeteagnostus
genus
accepted3505 Ma
Cambrian
501 Ma
Cambrian

Synonymy List

YearName and Author
1939Ptychagnostidae Kobayashi
1996Ptychagnostidae Westrop et al. pp. 812, 816
1997Ptychagnostidae Whittington et al. p. 350
2003Ptychagnostidae Hong et al.

References

Westrop S. R., Ludvigsen R., et al (1996) Marjuman (Cambrian) agnostoid trilobites of the Cow Head Group, western Newfoundland, Journal of Paleontology 70 5, 804-829
Whittington H. B., Chatterton B. D. E., et al (1997) Trilobita. Introduction, Order Agnostina, Order Redlichiida. Volume 1, Treatise on Invertebrate Paleontology O, 1-530
Hong P.S., Lee J. G., et al (2003) Trilobites from the Lejopyge armata zone (Upper Middle Cambrian) of the Machari Formation, Yongwol Group, Korea, Journal of Paleontology 77 5, 895-907
Benton, M.J. (ed). (1993). The Fossil Record 2. Chapman & Hall, London, 845 pp. - via The Interim Register of Marine and Nonmarine Genera
SN2000: Brands, S. J. (compiler) 1989-2005. Systema Naturae 2000. Amsterdam, The Netherlands (2006 version). Available online at http://sn2000.taxonomy.nl/. - via The Interim Register of Marine and Nonmarine Genera
extinct group - via The Interim Register of Marine and Nonmarine Genera
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!
 
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