| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ptychagnostus atavus
Taxonomy
Agnostus atavus was named by Tullberg (1880) [Lectotype designated and refigured by Westergård (1946, pl. 11, fig. 8).]. Its type specimen is LO354T, a cephalon/head, and it is a 3D body fossil. It is the type species of Acidusus.
It was recombined as Ptychagnostus (Acidusus) atavaus by Öpik (1979); it was recombined as Acidusus atavus by Laurie (1988) and Weidner and Nielsen (2014); it was recombined as Ptychagnostus atavus by Robison (1982), Westrop et al. (1996) and Hong and Choi (2015).
It was recombined as Ptychagnostus (Acidusus) atavaus by Öpik (1979); it was recombined as Acidusus atavus by Laurie (1988) and Weidner and Nielsen (2014); it was recombined as Ptychagnostus atavus by Robison (1982), Westrop et al. (1996) and Hong and Choi (2015).
Synonymy list
| Year | Name and author |
|---|---|
| 1880 | Agnostus atavus Tullberg p. 14 figs. pl. 1, figs. 1a-d |
| 1979 | Ptychagnostus (Acidusus) atavaus Öpik p. 93 figs. pl. 29, fig. 7, pl. 42, figs 7, 8, pl. 43, figs 1–4; text fig. 27 |
| 1982 | Ptychagnostus atavus Robison p. 136 figs. pl. 136, figs. 1-9 |
| 1988 | Acidusus atavus Laurie p. 180 |
| 1996 | Ptychagnostus atavus Westrop et al. p. 816 |
| 2014 | Acidusus atavus Weidner and Nielsen p. 32–35 figs. 9, 10A–D, 11A–H, 12F–H |
| 2015 | Ptychagnostus atavus Hong and Choi fig. 2.1–2.8 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Ptychagnostus atavus Tullberg 1880
show all | hide all
Diagnosis
No diagnoses are available
Measurements
No measurements are available
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|
||||
| Source: g = genus, f = family | |||||
| Reference: Hendy 2009 | |||||
Age range: base of the Tuesaian to the top of the Dresbachian or 505.30000 to 485.40000 Ma
Collections (56 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Taijangian | China (Zhejiang) | Ptychagnostus atavus (125682) | |
| Taijangian | China (Sichuan) | Ptychagnostus atavus (127058 127059 127060) | |
| Taijangian | China (Hunan) | Ptychagnostus atavus (49149 49150 49151 49153 49155 49156 49158 49159 49268 49269 49270 49271 49272 49273) | |
| Arcadian | Canada (New Brunswick) | Ptychagnostus atavus (64540) | |
| Middle Cambrian | Norway | Ptychagnostus atavus (155478) | |
| Middle Cambrian | USA (Nevada) | Ptychagnostus atavus (156500 156501 156502 156503) | |
| Middle Cambrian | USA (Utah) | Ptychagnostus atavus (86739 86741 86743 156504 156505 156506) | |
| St Davids | USA (Montana) | Ptychagnostus atavus (212) | |
| Tuesaian | Kazakhstan | Ptychagnostus atavus (118086 118087 118088 118089 118090 118092 118093 118094) | |
| Floran | Australia (Queensland) | Ptychagnostus atavus (90972 225175 225241) | |
| Menevian | USA (Utah) | Ptychagnostus atavus (10567) | |
| Marjumian | Canada (Newfoundland and Labrador) | Ptychagnostus atavus (9681) | |
| Marjumian | USA (Utah) | Ptychagnostus atavus (230679 230682) | |
| Wangcunian | China (Hunan) | Ptychagnostus atavus (49161 49275 128330 128921) | |
| Wangcunian | China (Zhejiang) | Ptychagnostus atavus (125537) | |
| Undillan | Australia (Queensland) | Ptychagnostus atavus (225230) | |
| Boomerangian | Mexico | Ptychagnostus atavus (200299) | |
| Guzhangian | China (Hunan) | Ptychagnostus atavus (128344) | |
| Dresbachian | Canada (Newfoundland and Labrador) | Ptychagnostus atavus (9702 9703) |