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Ptychagnostus ✝
| Description | Ptychagnostus is an extinct genus of blind trilobite that lived during the Cambrian period, part of the order Agnostida. Ptychagnostidae generally do not exceed ten millimetres in length. Their remains are sometimes found in the otherwise empty tubes of the polychaete worm Selkirkia. It probably lived in the water column. Its major characteristics are lack of eyes, two lobes on the glabella, and three lobes on the pygidium. From Wikipedia article at https://en.wikipedia.org/wiki/Ptychagnostus, which is released under the Creative Commons Attribution-Share-Alike License 3.0. | |||||||||||||||||||||||||||||||||||||||||||||
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| Source Data |
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| Rank | genus | |||||||||||||||||||||||||||||||||||||||||||||
| Taxonomy (GBIF,PBDB) | Life : Animalia : Arthropoda : Trilobita : Agnostida : Ptychagnostidae : Ptychagnostus | |||||||||||||||||||||||||||||||||||||||||||||
| Taxonomic Status (GBIF) | accepted | |||||||||||||||||||||||||||||||||||||||||||||
| Classification (PBDB,GBIF) |
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| Scientific Name | Ptychagnostus Jaekel, 1909 | |||||||||||||||||||||||||||||||||||||||||||||
| Name Published In | Zeitschrift der Deutschen Geologischen Gesellschaft, 61: 400, the paper Über die Agnostiden ruled under the plenary power to be treated as having been published in its entirety in 1909 and printed so that the definition of Ptychagnostus on p. 401 appeared at the top of p. 400 | |||||||||||||||||||||||||||||||||||||||||||||
| Opinions (PBDB) |
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| Status (PBDB) | extinct | |||||||||||||||||||||||||||||||||||||||||||||
| Taxon Size (PBDB) | 19 | |||||||||||||||||||||||||||||||||||||||||||||
| First Recorded Appearance | 513 - 505 Ma Cambrian | |||||||||||||||||||||||||||||||||||||||||||||
| Last Recorded Appearance | 501 - 485 Ma Cambrian | |||||||||||||||||||||||||||||||||||||||||||||
| Environment | marine (based on Trilobita) | |||||||||||||||||||||||||||||||||||||||||||||
| Motility | actively mobile | |||||||||||||||||||||||||||||||||||||||||||||
| Vision | blind (based on Ptychagnostidae) | |||||||||||||||||||||||||||||||||||||||||||||
| Diet | suspension feeder | |||||||||||||||||||||||||||||||||||||||||||||
| Ontogeny | molting,addition of parts (based on Trilobita) | |||||||||||||||||||||||||||||||||||||||||||||
| Ecospace Comments | LIFE HISTORY: Pelagic, fully motile slow, suspension-feeder according to Bambach et al (2007). | |||||||||||||||||||||||||||||||||||||||||||||
| 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/Ptychagnostus |
Fossil Distribution
Subtaxa
| Name | Status | Common Name(s) | Fossil Occurrences | Oldest | Youngest |
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| Ptychagnostus (Acidusus) ✝ subgenus | listed (PBDB) | ||||
| Ptychagnostus (Ptychagnostus) ✝ subgenus | listed (PBDB) | 12 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Aotagnostus minutus ✝ species | accepted (GBIF) listed (PBDB) | 2 | 505 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus acidusus ✝ species | listed (PBDB) | 4 | 505 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus aculeatus ✝ species | accepted (GBIF) listed (PBDB) | 24 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Ptychagnostus akanthodes species | accepted (GBIF) | No associated record in PBDB | |||
| Ptychagnostus aksayensis ✝ species | accepted (GBIF) listed (PBDB) | 3 | 505 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus atavus ✝ species | accepted (GBIF) listed (PBDB) | 51 | 513 Ma Cambrian | 501 Ma Cambrian | |
| Ptychagnostus convexus ✝ species | accepted (GBIF) listed (PBDB) | 2 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Ptychagnostus culminosus ✝ species | listed (PBDB) | ||||
| Ptychagnostus cuyanus ✝ species | accepted (GBIF) listed (PBDB) | 11 | 513 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus fissus species | accepted (GBIF) | No associated record in PBDB | |||
| Ptychagnostus hintzei species | accepted (GBIF) | No associated record in PBDB | |||
| Ptychagnostus intermedius ✝ species | accepted (GBIF) listed (PBDB) | 19 | 513 Ma Cambrian | 507 Ma Cambrian | |
| Ptychagnostus karatauensis ✝ species | accepted (GBIF) listed (PBDB) | 3 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Ptychagnostus leptus ✝ species | accepted (GBIF) listed (PBDB) | 5 | 513 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus punctuosus ✝ species | accepted (GBIF) listed (PBDB) | 18 | 513 Ma Cambrian | 505 Ma Cambrian | |
| Ptychagnostus seminula ✝ species | accepted (GBIF) listed (PBDB) | 13 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Ptychagnostus sinicus ✝ species | accepted (GBIF) listed (PBDB) | 2 | 513 Ma Cambrian | 513 Ma Cambrian | |
| Ptychagnostus spinosus ✝ species | accepted (GBIF) listed (PBDB) | 4 | 505 Ma Cambrian | 505 Ma Cambrian | |
Synonymy List
| Year | Name and Author |
|---|---|
| 1909 | Ptychagnostus Jaekel |
| 1979 | Aotagnostus Opik |
| 1996 | Ptychagnostus Westrop et al. p. 816 |
| 1997 | Ptychagnostus Whittington et al. p. 350 |
| 2002 | Aotagnostus Sepkoski, Jr. |
| 2002 | Ptychagnostus Sepkoski, Jr. |
| 1909 | Ptychagnostus Jaekel |
| Year | Name and Author |
|---|---|
| 1954 | Ptychagnostus Palmer p. 60 |
| 1979 | Aotagnostus Opik |
| 1996 | Ptychagnostus Westrop et al. p. 816 |
| 1997 | Ptychagnostus Whittington et al. p. 350 |
| 2002 | Aotagnostus Sepkoski, Jr. |
| 2002 | Ptychagnostus Sepkoski, Jr. |
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!
