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Isotelus violaensis

Trilobita - Asaphida - Asaphidae

Taxonomy
Isotelus violaensis was named by Amati (2014) [= ?1987. Isotelus homalonotoides (Walcott, 1877) in DeMott, pl. 3, figs. 21-26.]. Its type specimen is OU 11782, a cephalon/head (exfoliated cranidium), and it is a 3D body fossil. Its type locality is 99-48. U.S. Highway 99 Section, which is in a Turinian carbonate limestone in the Bromide Formation of Oklahoma.

Sister species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
2014Isotelus violaensis Amati pp. 12 - 14 figs. Pl. 3, Figs. 6-8, Pl. 4, Pl. 5, Figs. 1-3, ?4

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
subphylumMandibulata
RankNameAuthor
classTrilobitaWalch 1771
subclassLibristomaFortey 1990
orderAsaphidaSalter 1864
superfamilyAsaphoideaSalter 1864
familyAsaphidaeBurmeister 1843
subfamilyIsotelinaeAngelin 1854
genusIsotelusDekay 1824
speciesviolaensis

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
L. Amati 2014A species of Isotelus with facial sutures that diverge only slightly and for short distance in front of palpebral lobes then run nearly parallel until converge to mid-line. Frontal area very long (sag.), length about 20% total length of cranidium. Eye-stalks tall, extend well above maximum height of glabella. Lateral border of pygidium strongest over posterior 1/3 of pygidium, becomes much wider directly behind axis.