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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 Ptychopariida by Sepkoski (2002); and to Ptychopariidae by Jell and Adrain (2002).
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariida by Sepkoski (2002); and to Ptychopariidae by Jell and Adrain (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. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class | |||||
| References: Aberhan et al. 2004, Fortey and Owens 1999 | |||||
Age range: Delamaran or 509.70000 to 505.30000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Delamaran | USA (Nevada) | Y. benningtonis (134252) | |
| Delamaran | USA (Utah) | Y. benningtonis (10565 134067 134069 134070 134111 134113 134115 134116 134117) |