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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), 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), 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. |