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Ptychagnostus (Acidusus)
Taxonomy
Ptychagnostus (Acidusus) was named by Opik (1979) [Sepkoski's age data: Cm uMid-l Cm uMid-u]. Its type is Agnostus atavus.
It was synonymized subjectively with Ptychagnostus by Jell and Adrain (2002); it was reranked as Acidusus by Sepkoski (2002) and Weidner and Nielsen (2014).
It was assigned to Ptychagnostus by Opik (1979); to Agnostida by Sepkoski (2002); and to Ptychagnostidae by Weidner and Nielsen (2014).
It was synonymized subjectively with Ptychagnostus by Jell and Adrain (2002); it was reranked as Acidusus by Sepkoski (2002) and Weidner and Nielsen (2014).
It was assigned to Ptychagnostus by Opik (1979); to Agnostida by Sepkoski (2002); and to Ptychagnostidae by Weidner and Nielsen (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Ptychagnostus (Acidusus) Opik |
| 2002 | Acidusus Sepkoski |
| 2014 | Acidusus Weidner and Nielsen p. 32 |
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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.
Subg. †Ptychagnostus (Acidusus) Opik 1979
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†Ptychagnostus (Acidusus) germanus Öpik 1979
Diagnosis
No diagnoses are available