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Triplagnostus
Taxonomy
Triplagnostus was named by Howell (1935) [Sepkoski's age data: ]. It is not extant.
It was reranked as Ptychagnostus (Triplagnostus) by Westergård (1946); it was synonymized subjectively with Ptychagnostus by Jell and Adrain (2002).
It was assigned to Ptychagnostus by Westergård (1946); to Agnostida by Sepkoski (2002); and to Ptychagnostidae by Ergaliev and Ergaliev (2008) and Naimark and Pegel (2017).
It was reranked as Ptychagnostus (Triplagnostus) by Westergård (1946); it was synonymized subjectively with Ptychagnostus by Jell and Adrain (2002).
It was assigned to Ptychagnostus by Westergård (1946); to Agnostida by Sepkoski (2002); and to Ptychagnostidae by Ergaliev and Ergaliev (2008) and Naimark and Pegel (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Triplagnostus Howell |
| 1946 | Ptychagnostus (Triplagnostus) Westergård |
| 2002 | Triplagnostus Sepkoski |
| 2008 | Triplagnostus Ergaliev and Ergaliev |
| 2017 | Triplagnostus Naimark and Pegel pp. 1179 - 1180 |
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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.
G. †Triplagnostus Howell 1935
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†Triplagnostus gibbus Linnarsson 1869
†Triplagnostus scopus Öpik 1979
†Triplagnostus ultimus Öpik 1979
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. B. Naimark and T. V. Pegel 2017 | Cephalon with median preglabellar furrow. Glabellar M1 and M2 of equal width (not widened across M1 or M2); M1 inflated; F2 developed. Basal lobes with tendency to elongate, but usually oval. Pygidium with F1 and F2 equally developed; posteroaxis of moderate width and height. Posteroaxial furrow well developed. Prosopon usually smooth. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Hendy 2009, Kiessling 2004 | |||||
Age range: base of the Taijangian to the top of the Undillan or 509.00000 to 500.50000 Ma
Collections (42 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Delamaran | USA (Utah) | Ptychagnostus gibbus (10566) | |
| Amgan | Russian Federation (Siberia) | Ptychagnostus gibbus (10002) | |
| Amgan | USA (Utah) | Ptychagnostus gibbus (225065 225070) | |
| Solvan | Canada (Newfoundland and Labrador) | Ptychagnostus gibbus (10836) | |
| Solvan - Menevian | Czech Republic | Ptychagnostus vinicensis (73529) | |
| Taijangian | China (Hunan) | Ptychagnostus gibbus (49149 49158 49273) | |
| Taijangian | China (Zhejiang) | T. gibbus (125536) | |
| Taijangian | China (Sichuan) | T. gibbus (127058) | |
| Middle Cambrian | Norway | Ptychagnostus gibbus (155475) | |
| Middle Cambrian | USA (Utah) | Ptychagnostus gibbus (86728 86729 86730 86731 86732 86733 86735 86736 86737 86738 86739 86741 86742) | |
| Middle Cambrian | Poland | Ptychagnostus gibbus (72272) | |
| Taijangian - Guzhangian | China (Anhui) | T. sp. (127474) | |
| Taijangian - Wangcunian | China (Henan) | T. gibbus (127073) | |
| Tuesaian | Kazakhstan | T. gibbus (118054 118085) | |
| Floran | Australia (Northern Territory) | T. gibbus (225075) | |
| Floran | Australia (Queensland) | T. diremptus (225224) T. fretus, T. posterus, T. stramineus, T. quasigibbus, T. scopus (225241) T. posterus, T. sp. indet. (225175) | |
| Menevian | USA (Utah) | Ptychagnostus gibbus (10507) | |
| Marjumian | USA (Utah) | Ptychagnostus gibbus (230682) | |
| Wangcunian | China (Jiangsu) | T. sp. (127368) | |
| Undillan | Australia (Queensland) | Aristarius ultimus (225232 225246) T. diremptus (225226 225229) T. gibbus (225230) |