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Palmettaspis parallela

Trilobita - Redlichiida - Holmiidae

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).

Synonymy list
YearName and author
1995Palmettaspis parallela Fritz p. 720 figs. figs. 5.5, 5.6, 9.1–9.5
1999Palmettaspis parallela Lieberman p. 84
2006Montezumaspis parallela Hollingsworth p. 314 figs. Figures 6.1–6.14, 7.2, 7.3

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Ecdysozoa
—Panarthropoda
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
RankNameAuthor
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932
suborderOlenellina
superfamilyOlenelloidea
familyHolmiidaeHupé 1953
genusPalmettaspis
speciesparallela

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
ReferenceDiagnosis
W. H. Fritz 1995Palmettaspis 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 2006Sagittal 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.