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Ptychagnostus atavus

Agnostida - Ptychagnostidae

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).

Synonymy list
YearName and author
1880Agnostus atavus Tullberg p. 14 figs. pl. 1, figs. 1a-d
1979Ptychagnostus (Acidusus) atavaus Öpik p. 93 figs. pl. 29, fig. 7, pl. 42, figs 7, 8, pl. 43, figs 1–4; text fig. 27
1982Ptychagnostus atavus Robison p. 136 figs. pl. 136, figs. 1-9
1988Acidusus atavus Laurie p. 180
1996Ptychagnostus atavus Westrop et al. p. 816
2014Acidusus atavus Weidner and Nielsen p. 32–35 figs. 9, 10A–D, 11A–H, 12F–H
2015Ptychagnostus atavus Hong and Choi fig. 2.1–2.8

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
orderAgnostidaSalter 1864
suborderAgnostinaSalter 1864
superfamilyCondylopygoideaRaymond 1913
familyPtychagnostidaeKobayashi 1939
genusPtychagnostusJaekel 1909
speciesatavus()

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