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Yuknessaspis
Taxonomy
Yuknessaspis was named by Rasetti (1951) [Sepkoski's age data: Cm mMid-u Sepkoski's reference number: 1089]. It is not extant.
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Yuknessaspis Rasetti |
| 1994 | Yuknessaspis Sundberg p. 114 |
| 2002 | Yuknessaspis Jell and Adrain p. 462 |
| 2002 | Yuknessaspis 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. †Yuknessaspis Rasetti 1951
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†Yuknessaspis benningtonis Sundberg 1994
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†Yuknessaspis benningtonis benningtonis Sundberg 1994
†Yuknessaspis benningtonis planus Sundberg 1994
†Yuknessaspis benningtonis convexus Sundberg 1994
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg 1994 | Multisegmented, rni- cropygous Ptychopariida with cranidium with mod- erate length glabella, lateral glabellar furrows shal- low to absent, frontal glabellar lobe truncated to slightly rounded, deep preglabellar furrow, anterior portion of axial furrows very deep, straight to con- cave axial furrows, ocular ridges typically strong, palpebral lobe moderate length, posterior area of fixigenae wader than occipital ring, posterior border furrow distally curved anteriorly, fixigenae mod- erately wade, convex preglabellar field and anterior area of fixigena, anterior border slightly to strongly convex. |