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Libertella

Trilobita - Phacopida - Encrinuridae

Taxonomy
Libertella was named by Hu (1971) [Sepkoski's age data: O Cara-l Sepkoski's reference number: 694]. Its type is Libertella corona.

It was assigned to Encrinuridae by Hu (1971); and to Phacopida by Sepkoski (2002).

Synonymy list
YearName and author
1971Libertella Hu pp. 109 - 110
2002Libertella Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
RankNameAuthor
phylumArthropodaLatreille 1829
subphylumMandibulata
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
familyEncrinuridaeAngelin 1854
genusLibertella

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
C. Hu 1971Cranidium subtriangular to subtrapezoidal in outline, convex, having a pair of long fixigenal spines. Glabella strongly expanded forward without glabellar furrows. Fixigenae quadrate, broad posteriorly, occupied by a pair of small palpebral lobes. Librigenae narrow with steeply sloping ocular platform. Hypostoma diamond-shaped with a slightly convex median body. Thorax divided into at least eight segments; axis convex, elevated above pleural lobe, and bearing median spines. Pygidium subtriangular with five pairs of small marginal spines directed horizontally and three pairs vertically. Surface covered by large granules and spines.