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Palmettaspis parallela
Taxonomy
Palmettaspis parallela was named by Fritz (1995). Its type specimen is USNM 476027, a cephalon/head, and it is a 3D body fossil. Its type locality is UNSM "Green" Locality 1f, which is in a Montezuman marine siltstone in the Campito Formation of Nevada. It is the type species of Montezumaspis.
It was recombined as Montezumaspis parallela by Hollingsworth (2006).
It was recombined as Montezumaspis parallela by Hollingsworth (2006).
Synonymy list
| Year | Name and author |
|---|---|
| 1995 | Palmettaspis parallela Fritz p. 720 figs. figs. 5.5, 5.6, 9.1–9.5 |
| 1999 | Palmettaspis parallela Lieberman p. 84 |
| 2006 | Montezumaspis parallela Hollingsworth p. 314 figs. Figures 6.1–6.14, 7.2, 7.3 |
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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.
†Palmettaspis parallela Fritz 1995
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. H. Fritz 1995 | Palmettaspis species with nearly parallel-sided glabella, anterior pair (L3) of glabellar lobes markedly shorter (exsag.) than each of two preceding pairs, ocular lobes terminate opposite occipital furrow, and genal spines only slightly ad vanced. | |
| J. S. Hollingsworth 2006 | Sagittal length of preglabellar field equal to or slightly less than sagittal length of anterior border. Glabella typically parallel-sided with LA equal in width (tr.) to L0, anterior of LA rounded to somewhat pointed. L3 wider (tr.) than L2, S2 short and faint or absent at axial furrow. Ocular lobes gently curved, close to axial furrow. Narrow occipital spine arises as ridge on posterior half of L0. Axial rings of thorax have small longitudinal ridge on posterior half. Lateral margins of pleural spines backward-directed. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Aberhan et al. 2004, Whittington et al. 1997 | |||||
Age range: Montezuman or 520.00000 to 515.30000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Montezuman | USA (Nevada) | Palmettaspis parallela (type locality: 69466) |