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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 |
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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.
†Ptychagnostus atavus Tullberg 1880
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Diagnosis
No diagnoses are available