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Taxonomy
Ptychocephalus was named by Agassiz (1843) [Sepkoski's age data: O Trem-u O Aren-l Sepkoski's reference number: 795]. Its type is Ptyocephalus vigilans.
It was misspelled as Ptychocephalus by Sepkoski (2002); it was corrected as Ptyocephalus by Fortey (1975), Jell and Adrain (2002) and Peters (2003).
It was assigned to Isotelinae by Fortey (1975); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2002) and Peters (2003).
It was misspelled as Ptychocephalus by Sepkoski (2002); it was corrected as Ptyocephalus by Fortey (1975), Jell and Adrain (2002) and Peters (2003).
It was assigned to Isotelinae by Fortey (1975); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2002) and Peters (2003).
Synonyms
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Synonymy list
Year | Name and author |
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1843 | Ptychocephalus Agassiz p. 178 |
1942 | Kirkella Kobayashi |
1975 | Ptyocephalus Fortey |
2002 | Kirkella Jell and Adrain p. 294 |
2002 | Ptyocephalus Jell and Adrain p. 436 |
2002 | Ptychocephalus Sepkoski |
2003 | Ptyocephalus Peters |
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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. †Ptyocephalus Agassiz 1843
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†Kirkella declevita Ross 1951
†Ptyocephalus acclivus Hintze 1953
†Ptyocephalus vigilans Whittington 1948
Invalid names: Kirkella Kobayashi 1942 [synonym]
Diagnosis
No diagnoses are available