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Taxonomy
Porterfieldia was named by Cooper (1953) [Sepkoski's age data: O Aren-l O Cara-u Sepkoski's reference number: 378].
It was assigned to Triarthrinae by Harrington and Leanza (1957); to Oleninae by Ludvigsen and Tuffnell (1983); to Olenidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
It was assigned to Triarthrinae by Harrington and Leanza (1957); to Oleninae by Ludvigsen and Tuffnell (1983); to Olenidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1953 | Porterfieldia Cooper p. 8 |
| 1957 | Porterfieldia Harrington and Leanza |
| 1983 | Porterfieldia Ludvigsen and Tuffnell p. 572 |
| 2002 | Porterfieldia Jell and Adrain p. 429 |
| 2002 | Porterfieldia Sepkoski |
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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. †Porterfieldia Cooper 1953
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†Porterfieldia acava Edgecombe et al. 2005
†Porterfieldia convergens Whittard 1961
†Porterfieldia cuadrata Waisfeld 2001
†Porterfieldia fisheri Billings 1865
†Porterfieldia maanssonae Edgecombe et al. 2005
†Porterfieldia parapunctata Fortey 1974
†Porterfieldia sinensis Chang and Fan 1965
†Porterfieldia thor Fortey 1974
†Porterfieldia turneri Baldis and Poethe 1995
Diagnosis
No diagnoses are available