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Palmettaspis

Trilobita - Redlichiida - Holmiidae

Taxonomy
Palmettaspis was named by Fritz (1995) [Sepkoski's age data: Cm Atda-u]. Its type is Palmettaspis consorta.

It was assigned to Holmiidae by Whittington et al. (1997); to Olenellida by Sepkoski (2002); and to Holmiinae by Lieberman (1999) and Ebbestad et al. (2003).

Synonymy list
YearName and author
1995Palmettaspis Fritz p. 718
1997Palmettaspis Whittington et al. p. 416
1999Palmettaspis Lieberman p. 83
2002Palmettaspis Sepkoski, Jr.
2003Palmettaspis Ebbestad et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumMandibulata
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932
suborderOlenellina
familyHolmiidaeHupé 1953
subfamilyHolmiinaeHupe 1953
genusPalmettaspis

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.

Diagnosis
ReferenceDiagnosis
B. S. Lieberman 1999Anterior cephalic border prominently separated from extraocular area by fur- row, border developed as rounded ridge; frontal lobe does not contact anterior cephalic border furrow (variably developed in “P.” cometes); frontal lobe expands prominently dor- sally; anterolateral margins of glabella prominently separated from anterior extraocular area; length (sag.) of frontal lobe equal to 1 to 1.1 times length (sag.) of L0 and L1; S3 evenly convex; notch in ocular lobes where they contact frontal lobe (not in “P.” cometes); S1, S2 and S3 conjoined medially; posterior margin of ocular lobe opposite distal tip of S0 or me- dial part of distal margin of L0; line from posterior margin of ocular lobe to junction of posterior margin of lobe with glabella forms roughly 0 to 15 degree angle with sagittal line; L0 with spine, posterior of midline; intergenal angle with small spine directly behind distal tip of ocular lobe; extraocular region prominently vaulted, width (tr.) at L1 45% to 55% width of glabella at L1; genal spine extends back roughly eight thoracic segments; thoracic pleural spines very short (exsag.), extend back only one segment, lateral margins inclined at 10 to 20 degree angle relative to sagittal line (see Fritz 1995 for additional characters).